NT GoMap

NT GoMap Users Guide

NT GoMap is a robust online mapping tool to discover, search, display, and download information from our large collection of GIS (Geographic Information System) data and geoscience-related publications. It can be used to query subsets of data as determined by the user and to visualize the results. Information available includes mineral showings, exploration reports, petroleum industry reports, digitally submitted geophysical and geochemical data, and diamond/kimberlite sample data.

Our data is collected and compiled from field observations, research, analysis, and organized into themed collections within NT GoMap. Users can perform complex queries - the combination of spatial and geoscience query options provide excellent search capabilities to meet the diverse needs of NTGO’s clients. For example, users can locate and download all Showings or References that are within a geological province or are within 100 kilometres of a community. NT GoMap is tightly integrated with Gateway, allowing users to query and download publications derived from database queries and spatial or geographic constraints.



NT GoMap Main Page

The default NT GoMap page is organized into "frames" (dynamic sections within a web page). There are a number of  important frames with which you will interact with in carrying out the tasks NT GoMap provides as follows:

  • The "Header Frame" contains the NTGO logo and links to the "Download Wizard" and "Gateway Cart".
  • The "Toolbar Menu" or Menu Frame provides a series of tool group names. When you click on one of these tool group names, the tools belonging to that group are presented in the "Dynamic Toolbar" area.
  • The "Dynamic Toolbar" is updated when you click on a tool group name on the "Toolbar Menu". It will provide icons representing tools for the selected group; by clicking on these icons you launch the tool of interest.
  • The "Standard Toolbar" doesn't change; it presents a set of standard tools that are frequently used, such as navigation tools used for moving around in the "Map Window" or Map Window Frame.
  • The "Map Window" is where all maps are displayed. Upon entering this application, a map displaying the full geographical limits available for viewing is presented in this frame. Using navigation functions and most other tools and functions will cause this map window to refresh dynamically.
  • Located on the right-hand side of the web page is the "Legend Panel" or Text Frame. This frame is where much of the interaction between the user and the application takes place. When the user selects one of the buttons in the toolbar, instructions and information are often displayed in this Text Frame area. For example, if the 'Custom Query' button is clicked, the corresponding query instructions are displayed here for the user to perform the desired query.
  • A "NT GoMap Status Bar" or Mode Frame situated below the Map Window provides the user with important information such as the "Active Layer" and the 'Mode' (Active Tool) the application is in. The 'Mode' generally refers to the function currently selected (e.g. Zoom in, Zoom out, Pan). The Mode, by default, upon entering the web site is 'Zoom in'. The current map scale is displayed in this frame as well; you can change the scale of the map by entering the desired scale in the text area and clicking the "GO" button.
  • At the very bottom of the screen is the "Browser Status Bar" or Message Area which displays the current X and Y coordinates of your mouse cursor, and may provide text messages when specific tools are used.

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Browser Settings

At this time, NT GoMap only supports Microsoft Internet Explorer. Support for other popular Internet browsers is currently under development.

NT GoMap presents alot of information on each screen and therefore work best with a screen resolution of 1024 x 768 or higher. It will function fine at 800 x 600 resolution although the maps and table information will be larger and require more scrolling. NT GoMap requires specific browser settings to be set in order to function properly. If you are using Internet Explorer, it is strongly recommended that you add NT GoMap to your trusted sites list. By doing this, you can keep the pop-up blocker and other security-related settings enabled for standard Internet activity, but have them turned off for trusted sites.

Plese refer to the link below which provides instructions on how to configure the required browser settings. They are specific to Internet Explorer 7 but are also applicable to previous and newer versions.

Help for first time NT GoMap Users

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Tools

There are 2 toolbars active in the NT GoMap application window. Standard tools - those the most frequently used - are presented in the Standard Toolbar Frame, while less commonly used tools are displayed in groups in the Dynamic Toolbar Frame. The dynamic toolbar changes as you click on the tool group names in the Toolbar Menu.

In the descriptions provided below, the tools have been listed according to their general function. For example, tools used to navigate the map window are described under "Navigation Tools", and tools used to construct and carry out searches and queries are described under "Search and Query Tools". Each of these groupings, and each tool within each grouping, is described separately below.

Navigation Tools

This group of tools represents functions that you can use to move around in the geographical area presented in the Map Window Frame. You can use these tools to zoom in to a more detailed scale, zoom out, pan the view frame, zoom to the extents of a particular layer, and so on.

Zoom In
This icon allows you to zoom in on a specified area displayed in the 'Map Window' frame. There are two ways in which you can 'Zoom in'.

Zoom to Center
  1. Make sure 'Zoom in' is the Active Mode by clicking on the "Zoom in" button on the toolbar.
  2. Move the cursor to the position on the map that you would like as the center of your next map.
  3. Click the left mouse button.
  4. A new map will be generated to half the extents of the previous one, centered on the point specified. Generally, the more you zoom in, the more details are shown on the map.
Zoom Box
  1. Make sure 'Zoom in' is the Active Mode by clicking on the "Zoom in" button on the toolbar.
  2. By holding down the left mouse button drag across the area desired. As you click and drag a box will be created around the area you wish displayed in the resulting map.
  3. Release the left mouse button.
  4. A new map will be generated that displays the area defined by the box created in step 2.
Zoom out
The 'Zoom out' button increases the extents of your current map displayed in the 'Map Window Frame'. To 'Zoom out' complete the following;
  1. Make the Active Mode 'Zoom out' by clicking on the "Zoom out" button on the toolbar.
  2. Move the cursor to the position on the map in the 'Map Window Frame' you would like as the center for the next map.
  3. Click the left mouse button
  4. A new map will be generated that is twice the extent of the previous one. Generally, the further you zoom out the less detailed the map.
Zoom to Previous Extents
Clicking on the 'Zoom to Last Extent' button will zoom to the last screen displayed prior to making a selection using the Zoom In, Zoom Out, Zoom to Full Extent, and Pan buttons on the Toolbar.

If selected repeatedly, it will flip back and forth between the last two selections made.

Recentre Map
Clicking on the 'Recentre Map' button allows you to centre the map around the point you wish.

Simply click on this icon to initiate the Recentre Map mode, then click in the Map Window where you want the new map centre to be. The map will refresh, centred around the point you clicked.

Pan
The map frame has directional arrows that you can use to move the Map Window up, down, sideways or diagonally to display areas that currently are not visible. It redefines (shifts) your map area without zooming in or out, while maintaining the current map scale.

Zoom to Full Extent
Clicking on the "Zoom to Full Extent" button on the toolbar will zoom out to the full extents of all available layers.

Zoom to Active Layer
Click the "Zoom to Active Layer" button to zoom the Map Window to the extents of the "Active Layer".

Zoom to View Scale
The NT GoMap allows you to view the map directly at any desired scale. In order to see the map at a specific scale, the following steps must be taken.
  1. Enter the desired scale in the mode frame at the bottom left of the Map Window.
  2. Click on the "Go" button. The map will be redrawn at the desired scale.
NOTE: The map will zoom to approximately the desired scale. However this is not a precise function. Use the measure tool to determine exact distances; do not measure from the screen.

Quick Search
The "Quick Search" tool allows you to execute a query based on predefined fields. The map than will be zoom at the selected feature result and a SR window will be provided for the tabular results. Follow these steps to execute a search:
  1. Select Quick Search button from the menu. This will open "Quick Search menu" page is the Text Frame.
  2. This page provides a list of pre-defined group searches that contains various individual searches.
  3. Click on the group search you want, the menu unfolds and you can select an actual search.
  4. When you click on the search itself a new page it will open in the same frame.
  5. Please enter the required information to define your search.
  6. Once complete, click the Submit button to perform the task. A new ' Query/Selection Results' window will open displaying the results of the search.
  7. If you want to execute a different search click on Cancel button and the page will return at the menu level page.

   Zoom To NTS
The "Zoom To NTS" function performs essentially the same function as the "Quick Search" function discussed above. "Zoom To NTS", however, will display a list of only NTS searches. This operation simply avoids the confusion of having other selections to choose from as defined in the "Quick Search" tool.

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    Find Map Coordinates
The "Find Map Coordinates" tool allows you to capture the coordinates of a given point by clicking anywhere on the map, or to quickly recenter the map to a given point. Follow these steps to capture the map coordinates:
  1. Select the "Find Map Coordinates" button from the 'Zoom To' menu. This will open the "Capture Coordinates" form, with editable X and Y coordinate input boxes and a "Go" button.
  2. Using this form, you can either click on the map, to have the latitude and longitude coordinates populated, or choose to edit the coordinate values, then click "Go", to recenter the map to the new point.
  3. If you wish to enter points in a different projection, select the projection using the "Select Projection" function from the "Map/View" menu first. Then, clicking "Go" will convert the points you edit to that projection, and correspondingly clicking on the map will populate the points with values in your chosen projection.
  4. If you choose to zoom to a specified point, the application will first check for valid map coordinates before proceeding.  X and Y coordinates are valid if they are both not null values, either integer or decimal.
  5. If coordinates are valid, clicking on "Go" will cause the map to be re-centered around the new specified point.  A red star symbol will be drawn on the map to mark the X,Y coordinate point entered.
    Zoom To Box
The "Zoom To Box" function allows you to zoom the map to a given rectangle that you supply the map coordinates for. You have the option to select the projection of your choice and to enter the coordinates in the new projection. Follow these steps to zoom to a rectangle:
  1. Select the "Zoom To Box" button from the "Zoom To" menu. This will open the "Zoom To Box" page in a right frame or in a new window, with editable min X, min Y, max X, max Y coordinates, a coordinate projection dropdown menu, and a "Go" button. The coordinate projection menu defaults to the current map projection.
  2. If you wish to enter points in another coordinate system, select the corresponding projection from the projection dropdown menu.
  3. Enter the rectangle's Min X, Max X, Min Y and Max Y values. Note that the rectangle you define should be roughly in the same aspect ratio as your map. The application will check for valid map coordinates, i.e.not null values, either integer or decimal.
  4. If coordinates are valid, clicking on "Go" will cause the map to zoom to the specified rectangle. A corresponding red rectangle will be drawn on the map.


Map Display Manipulation Tools

This group of tools includes functions that change the way layers are presented in the Map Window. Layers can be turned on or off (made visible or invisible, layer symbology (display settings) can be changed, layer order can be changed, and settings can be saved for layer use, among other functions.

Manage Layers
This function is used to "load" or "unload" layers from the layer list that is available when you select the "Layer" button from the toolbar. In other words, the "Manage Layers" function makes additional layers available to you, or removes layers when you don't need them so that the Layer List does not get overly cluttered.

To "load" or "unload" layers, carry out the following steps:
  1. Select the "Add/Remove Layers" button from the "Layer" menu. This will cause the 'Manage Layers' form to open in a new browser window with the functions required to add or remove layers:
  2. The 'Manage Layers' form provides a hierarchical grouping and presentation of available layers. The groups, and individual layers belonging to each group, each have a checkbox to the left of the group or layer name. Use this checkbox to load or unload a layer.
  3. Layers already available in the layer list will appear checked in the 'Manage Layers' form when it opens. To remove a layer that is currently available, uncheck it. To add a layer not currently available, check it.
  4. To add or remove a whole group, the checkbox to the left of the group name can be used.
  5. Clicking 'Apply' at the bottom of the form will cause changes made here to be reflected in the Layer List, and will leave the form open; clicking 'OK' will cause changes made here to be reflected in the Layer List and will close the form; clicking "Close" exits the form, without making any changes.
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Customize Layer
Using the interface provided by the "Customize Layer" option, the user can customize any layer by choosing the colours and the symbology desired.

Layer Properties (how a layer is displayed) can be changed using the "Customize Layer" function. You can change the color, size, and style of symbols, and add or remove layer labelling. In addition, you can choose to display all features in a given layer using the same symbols, or you may choose to display layers thematically, by using a unique symbol for each unique attribute in one of the layer's attribute fields, or by using a unique symbol for each of a series of ranges of attributes. Each of these approaches is described separately below.

Changing Layer Appearance

Regardless of whether you wish to apply one symbol, unique attribute based symbols, or attribute range based symbols to a layer, there are certain basic steps to follow:
  1. Click the "Customize Layer" button from the 'Layer' menu.  The "Customize Layer" form will appear.   (NOTE: The Customize Layer form will differ depending on the geometry type of the selected feature. The specific procedures for customizing each geometry type are provided in the sub-sections following this one).
  2. Select the layer name in the Layer List dropdown list.
  3. Select the type of customization you wish to apply: one symbol for all features in a layer, unique symbols based on unique attribute values, or unique symbols based on ranges of attribute values (graduated).
  4. NT GoMap tracks the current symbolization of a layer, as well as the "default" symbolization of layers (that is, the symbolization applied to a layer when a NT GoMap session is started. The current symbolization will be shown in the "Customize Layer" form. To restore a layer's symbology back to its default, simply click the "Restore Layer Default" check box.
  5. The "Customize Layer" form has 2 sections.  The left section provides functions to define the symbol (or symbols) with which a layer is to be depicted, while the right section defines the labelling to be applied to a layer. (Labelling a layer will cause text to appear on the map adjacent to each feature of that layer. The text is taken from the values of the attribute field selected.)
  6. To retain the existing symbology as it is, while adding or removing labels, click the "Keep Existing Symbology" checkbox in the left section. Then, in the right section, check or uncheck the "Add labels to this layer?" checkbox.
  7. If adding labels, complete the other settings in the right-hand section. See the Procedure – Adding labels section in this Help file for instructions on doing this.

Drawing features with one symbol

Select this option if you wish that all features in the active layer to be depicted in the Map Window with the same symbol.

  1. If the selected layer is a "point" layer, you may customize:
    • The colour of the symbol. To pick the colour, click on "Pick". A new window with the colours will be displayed. To select it, you have only to click on the colour you want in the pick window. (You may also type in the hexidecimal value for the colour you want if you know it.)
    • The point style.
      • You may choose the "Basic" style, that will allow you to select the standard symbols:
        • circle
        • square
        • cross
        • triangle
        • star
    • The Point Size (the default is 8).

  2. If the selected layer is a "line" layer, you may customize:
    • The Line Colour. To pick the colour, click on "Pick". A new window with the colours will be displayed. To select it, you have only to click on the colour in the pick window.
    • The Line Style. You may select from:
      • solid
      • dash
      • dot
      • dash dot
      • dash dot dot
      • railroad line
    • The Line Weight (the default is 1).

  3. If the selected layer is a "polygon" layer, you may customize:
    • The Fill Type. You may select from:
      • solid
      • transparent
      • horizontal
      • vertical
      • upward diagonal
      • downward diagonal
      • cross
      • diagonal cross
      • light screen
      • screen
      • dark screen
    • The Fill Colour. If you have selected "transparent" fill, leave this blank (it will be ignored anyway). To pick the colour, click on "Pick". A new window with the colours will be displayed. To select it, you have only to click on the colour in the pick window.
    • The Outline Style. You may select from:
      • solid
      • dash
      • dot
      • dash dot
      • dash dot dot
      • railroad line
    • The Outline Weight (the default is 1).
    • The Outline Colour. To pick the colour, click on "Pick". A new window with the colours will be displayed. To select it, you have only to click on the colour in the pick window.

Applying Symbols By Attribute Value Ranges

Select this option if you wish to depict a layer using multiple symbols, based on ranges (or graduations) of attribute values. For example, a "Communities" layer may contain an attribute value field capturing the population of each city, and you may wish to display those cities with different symbols based on population ranges - less than 2,500, less than 5,000, less than 10,000, and greater than 12,000, for example.

  1. On the "Customize Layer" form, select "Graduated Symbols" from the "Customization Type" dropdown box.
  2. Select a field on which to base the range based symbolization.  (NOTE: Only numeric fields are supported for range based symbolization at this time. If no numeric fields are present in the layer in question, range based symbolization will not be possible).
  3. At this point, the form will refresh; a table will appear in the bottom portion of the form showing the initial ranges and symbols based on the default starting and ending colour, the default number of classes, and the field selected.
  4. All of the settings on the form can be further customized at this point. In the upper portion of the form, different start and ending colours, and/or a different number of classes can be selected, and the table in the lower portion of the form regenerated. (The other settings work as with the One Symbol option.) In the table in the lower portion of the form, the colours, symbols, and labels can be customized. Currently, the ranges for the graduated symbols cannot be modified.
  5. To change a colour in the table, click on the colour and select a new colour from the popup colour grid. 
  6. To change a symbol in the table (point features only), change the settings in the upper portion of the form, then click 'Apply' next to the specific range entry in the table you wish to change.
  7. Click 'Apply' to update the map display and reflect the chosen settings.
  8. Click 'Close' to close the window (changes will not be applied unless the 'Apply' button is first pressed).

Applying Symbols Using Unique Attribute Values

Select this option if you wish to depict a layer using multiple symbols, based on unique attribute values. For example, the "Geological Provinces" layer contains an attribute value field identifying the name of each Geological Province, and you may wish to display those provinces with different symbols for each name.

  1. On the "Customize Layer" form, select "Unique Symbols" from the "Customization Type" dropdown box.
  2. Select a field. At this point, the form will refresh; a table will appear in the bottom portion of the form showing the unique values and initial symbols based on the default starting and ending colour, and the number of unique values found for the field selected.
  3. All of the settings on the form can be further customized at this point. In the upper portion of the form different start and ending colours can be selected, and the table in the lower portion of the form regenerated. (The other settings work as with the One Symbol option.) In the table in the lower portion of the form, the colours, symbols, and labels can be customized. Currently, the list of unique values cannot be modified.
  4. To change a colour in the table, click on the colour and select a new colour from the popup colour grid.
  5. To change a symbol in the table (point features only), change the settings in the upper portion of the form, then click 'Apply' next to the specific range entry in the table you wish to change.
  6. Click "Apply" to update the map display to reflect the chosen settings.
  7. Click "Close" to close the window (changes will not be applied unless the "Apply" button is first pressed).

Adding labels

For all layer types, you can choose to add labels to the feature, by selecting the "Add Labels to this Layer?" checkbox on the "Customize Layer" form and completing the following steps:
  1. Make the appropriate selection from the 'Label Field' dropdown list.
  2. Enter a value in the 'Label Size' text box (the default is 8).
  3. Select the font from the 'Font' dropdown list.
  4. Select the Font Colour. To pick the colour, click on "Pick". A new window with the available colours will be displayed. To select it, you have only to click on the colour in the pick window.
  5. You can choose the placement of the labels relative to the features. Use the "Placement" radio buttons to have the labels appear in one of 8 possible positions around the feature (e.g. to the left and above, directly below, to the right, etc.); OR:
  6. Click the "Place on Top" checkbox to have the labels positioned directly on top of the features. (Note: this will cover the feature.)
  7. You also have the option of adding a shadow to the label by clicking the 'Shadow' checkbox on and applying a background and outline colour to that shadow.
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Add Map Text Add Map Text
Use the "Map/View" function to add text notations to your Map Window. This function allows you to place a symbol on the map and annotate it. To annotate the Map Window, follow these steps:
  1. Select the "Annotate Map" button from the toolbar. This will bring up the "Annotate Map" form in the Text Frame to the right.
  2. Select a symbol type, either: 'Pin Symbol', 'Point Symbol', 'Line Symbol', 'Rectangle Symbol', 'Shape Symbol' or 'None' for text only.
  3. Check or uncheck the 'Include Text?' check box. This checkbox is optional for symbol annotations.
  4. Customize the symbol, if you have selected a symbol annotation:
    • for Pin symbol, select a pin style from the options presented.
    • for Point symbol, choose a colour, style and size.
    • for Line symbol, choose a colour, style and weight.
    • for Rectangle and Shape symbol, choose a fill style, opacity, fill colour, outline style, outline weight, outline colour.
  5. For text, point and pin annotations, click the location on the Map where you would like the annotation symbol and/or text to be placed. For line and shape annotations, click on the map for the polygon points, then click on "Complete" button to complete the line/shape. For rectangle annotation draw and drag the rectangle on the Map, using the mouse.
  6. If the 'Include Text?' check box was checked, a new browser window will open to display the "Add Text On Map" form, with functions to customize the appearance of your label. Note that for line and shape annotations this new window will only open after completion of the line/shape.
  7. In the "Add Text On Map" form, enter the text you wish to add to the map.
  8. Use the remaining tools on this form to customize the appearance of your text. You can select the text font, colour, style and size; and you can choose to add shadow, glow, background and outline effects to your text. Finally, you can choose to place your text at any angle by entering a value between 0 and 360 and checking the "Angle" checkbox.
  9. Click the "Add Text" button to add the label to the map. In case of a symbol annotation, the label will be used to annotate the symbol.
  10. If at any time you wish to remove your annotation from the map, first select the annotation type in the 'Edit Existing Annotation' list box in the Text Frame ("Annotate Map" form), then select the "Remove" option and click on the 'Apply' button.
Reorder Layers
By default, the various layers available in the NT GoMap application display in the order they are listed in the 'Layer List'. That is, the layers at the top of the list are drawn on top of the layers further down.

Using the interface provided by the "Reorder Layers" option, the user has the ability to change the order in which the layers are drawn.

To reorder the layers complete the following steps:
  1. Make 'Active' the layer you wish to change the order of by selecting it in the 'Layer List'.
  2. Select the "Reorder Layers" button from the 'Layer' menu.
  3. A new 'Reorder Layers' window dialog will open. The bottom section of this form displays the current order of the layers.
  4. On the 'Reorder Layers' form, using the arrow to the right of the 'Beneath' dialog box, make a selection. The selection made will appear directly above the "Active Layer" when executed.
  5. Click the "Apply" button to carry out the desired change. The bottom section of this form will be updated to display the change made.
  6. Click the "OK" button to return to the layer list and pick another layer to reorder.
Manage Bookmarks
Use this feature if you would like to bookmark a view of the map to recall for later use. You can save multiple views or recall previously saved ones.

To save a bookmark:

  1. Select the "Manage Bookmarks" button from the 'Map/View' menu. The "Manage Bookmarks" dialog window will open.
  2. Enter a name to reference it by in the "Name" text field and click the "Save" button.
  3. To recall a previously saved bookmark, select one from the "Saved Bookmarks" list and click the "Load" button.
  4. To remove a previously saved bookmark, select one from the "Saved Bookmarks" list, and click the "Remove" button.
Open Project File
This option allows the user to load the settings saved in a previous session.
In order to apply custom settings previously saved to the current GIS Intranet Display complete the following:
  1. Select the "Load Project File" button from the Map/View menu. This will cause a new "Load Settings" dialog window to appear which you can use to find the settings file you wish to load.
  2. Click on the "Browse" button.
  3. The 'Choose File' window will appear. Navigate to the location of the file you wish to load.
  4. Select the file that contains the settings you want to load and click "Open".
  5. The file name will be displayed in the dialog box to the left of the 'Browse' button.
  6. Click "Load".
  7. The file will be loaded and the map re-drawn using the previously saved settings.
NOTE: The "Load Project File" option needs to access a file saved previously using the "Save Project File" option. In order for your browser to allow this, the security settings in your browser may need to be changed. Do this by following the steps outlined under theBrowser Settings section of this document.

Once the Browser settings have been modified you will have the ability to use the "Load Settings" dialog window.

Save Project File
This option allows the user to save current Map Window settings for use in future sessions.
In order to save the current settings, the user must complete the following:
  1. Select the "Save Project File" button from the Map/View menu.
  2. A new "Save Settings" dialog window will open displaying the customizations from the current session.
  3. Click on the "Save" button.
  4. The 'File Download' dialog box will appear. Click the "Save" button. 
  5. The 'Save As' dialog box will appear. If you wish to alter the default filename and location, do so here. Click "Save".
  6. The 'Download Complete' form will appear. Click "Close".
NOTE: If the file is saved in a central location, this file can be used by any user that has access to load the file. For example, you could create standardized views of the NT GoMap data for specific user groups, and save them in a shared network location.

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Query and Selection Tools

This group of tools provides functions for carrying out analysis on the data layers available in the NT GoMap Map Window. Tools are provided to search for features based on their "attribute" data, retrieve detailed information for features, build "buffers" around features, and other similar functions.

Select
The "Select" tool allows the user to select/highlight features in the Map Window. By selecting features you have the ability to perform further operations on that feature, such as construct a retrieve detailed information for the selected features, extract the data to a Shape file, or produce a report on those features. To use the "Select" tool:
  1. Click on the "Select" button from the "Query" menu. The "Selection" page is displayed in the right frame, and requires additional action in order to perform the function.
  2. Click on the "Selection Type" dropdown list to set the type of selection desired. The options are: Select By Point, Select By Polygon, Select By Line, or Select By Box (each method of selection is defined in greater detail below).
    NOTE: The 'Selection' window changes based on the type selected.
    The 'Select By Polygon' and 'Select By Line' types include an additional section in the 'Text Frame'.
  3. In the "Select Features From" dropdown list select the layer to query on. This will become the active layer. If you select a Layer that is not currently visible, the Map Window will refresh with the selected layer now visible. NOTE: Selecting an area that are not part of the Active Layer will result in an message being displayed indicating that no features were found.
  4. If the selection was successful, the selected feature will be highlighted (change colour to the highlight colour).
  5. If the selection was successful, click on the "Show Attribute" button in order to see tabular information about the features.
  6. You have the option to save the selected feature as a new temporary layer on the map by clicking on "Save As Layer" button.
Methods of Selection:
  1. Select by Point
    • Place the cursor over the desired feature and click the left mouse button.
  2. Select by Polygon
    • Place the cursor along the edge you wish to select and click the left mouse button once. A point will be placed on the map.
    • Move the cursor to the next place along the edge of an area you wish to select and click again. Again a dot will be placed and a line will connect the two points you have placed.
    • Repeat the above steps until you have defined the selection area.
    • To complete the shape, click on the "Complete Polygon and Select" button
  3. Select by Line
    • Place the cursor at one end of the area you wish to select and click the left mouse button once. A 'red dot' will be placed on the map.
    • Move the cursor to the next place along a line and click again. Again a dot will be placed and a line will connect the two points you have placed.
    • Repeat the above step until you have defined the selection line.
    • To complete the line, click on the "Complete Line and Select" button
  4. Select by Box
    • Place the cursor in one 'corner' of the area you wish to select and click and hold the left mouse button.
    • Drag the cursor to the opposite corner of the area you wish to select, as you drag the pointer, a box will be drawn which will define the selection area. Release the left mouse button when the box surrounds the desired area.
Adding to the Selection:
  1. You can add to the initial selection by clicking on the "Add to Selection" button.
  2. Move the cursor to the desired location you wish to add and press the left mouse button.
  3. The map will be redrawn with the last selection added to the highlighted selected features.
    NOTE: The feature being added must be from the same layer as the initial selection.
Deleting From the Selection:
  1. You can remove items from the selected features by clicking on the "Delete From Selection" button.
  2. Move the cursor to the feature you wish to remove and press the left mouse button.
  3. The map will be redrawn with the last selection removed from the highlighted selected features.
    NOTE: The feature being removed must be from the same layer as the initial selection. You can not remove from the selection after the 'Buffer Selection' process has been executed.
Clear Selection:
To erase any previous selections and buffers, click on the "Clear Selection" button. A new map will be generated without any highlighted features from which you can start adding new selections.

Show Attributes:
To display detailed information associated with the selections currently made, click on the "Show Attributes" button. This will cause the data to be presented in a new browser window. You can save this data to a text file (comma delimited); you can also zoom to all selected features by clicking the "Zoom to Records" button, or zoom to a specific feature selection by clicking that feature's hyperlink (located in the "Map" column). You may also save the selected feature(s) to a new, temporary layer in the Layer List/Legend.

Save as Layer:
The currently selected feature(s) may be temporarily saved as a new entry in the "Layer List/Legend" area. Do so by ensuring that at least one feature has been selected from the Map Window and selecting the "Save as Layer" button. A new "Selection Layer Settings" dialog window will open where you can enter the name of the new, temporary layer. Click on the "Submit" button to complete the task. The new layer will be added to the Legend under the "Selection Layers" category. From here the new layer can be deleted, turned on and off (i.e. made visible or not visible), and have its attributes displayed in a new "Query/Selection Results" window.

Restart:
This button will allow the user to add to an existing selection without a connecting line or shape between the initial selection and the new selection. This button is only available for 'Select by Line' and 'Select by Polygon'.

Delete Last Point:
The "Delete Last Point" button allows the user to remove the previous point when creating a line or shape. This button is only available for 'Select by Line' and 'Select by Polygon'.

Complete Line/Polygon & Select:
This button, "Complete Line/Polygon & Select", is self explanatory and is only available for 'Select by Line' and 'Select by Polygon'.

Clear Selection
When you execute a query, the Map Window refreshes giving the selected feature(s) a different colour. This makes the selected feature(s) easy to identify. The 'Clear Selection' tool will remove selection of all features and create a 'fresh' map at the current map scale.


  Clear Highlighted Features
When a selected feature(s) is mapped from the "Query/Selection Results" window, the Map Window zooms to the feature(s) mapped and the area is highlighted in yellow to easily identify the selected feature(s). The 'Clear Highlighted Features' tool will remove all highlighting from those features but the original feature selection will remain intact.

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Identify
The 'Identify' tool allows you to review information about selected features. To use this functionality:
  1. Make sure the feature you want to identify is in the Active Layer.
  2. Make 'Identify' the Active Mode by clicking the "Identify Feature" button from the Standard Toolbar frame.
  3. Move the cursor to the feature you want to review information (attributes) for.
  4. Click the left mouse button.
  5. A table displaying database information for the selected feature is displayed in a new "Quick Identify" dialog window. By clicking on the "More Information" button, you can save this data to a text file (comma delimited); you can also zoom to a specific identified feature by clicking that feature's hyperlink (presented in the "Map" column) or add the feature as a new, temporary layer in the "Layer List/Legend" area.

     Show Attributes
The 'Show Attributes' tool opens the "Query/Selection Results" dialog window and allows you to review information about selected features in the Active Layer.

Custom Query
Using the interface provided by the "Custom Query" option, you can execute a query on any feature layer. By choosing the data field and entering a value or range of values for that field, you can customize the query to your specifications.

To execute a Custom Query complete the following:
  1. Click on the "Custom Query" button from the "Query" menu. The 'Text Frame' then displays the 'Custom Query' form.
  2. Select the feature you wish to query from the "Layer" dropdown list (e.g. Lakes, 1:7.5M).
    NOTE: If you select a Layer that is not currently visible, the Map Window will refresh with the selected layer now visible.
  3. Select the "Field" you wish to base your query on (e.g. NAME).
    NOTE: The "Field" selections vary depending on the "Layer" selection made.
  4. Select the desired "Operator" type (e.g. =). (If none is selected, "equal" is assumed.)
    The available Operators are:
    • <   (less than)
    • =   (equal)
    • >   (greater than)
    • <=   (less than and equal to)
    • >=   (greater than and equal to)
    • LIKE   (a "LIKE" query is used to evaluate text fields for all records containing the entered string)
    NOTE: There are 2 methods for selecting the appropriate 'Operator' to use. The dropdown list provides a list of standard operators such as =, <, >, and so on. The buttons located below the 'Operator' option provide the 'AND', 'OR' and 'NOT' operators for constructing more complex queries. For a simple query, the latter buttons will not be required and can be ignored.
  5. Select the value you wish to search for in the "Value" list box (which becomes populated when the "Load" checkbox is selected), or enter text in the text box above it.  (Note:  DO NOT PRESS ENTER - This will cause the page to refresh, and you will lose your selections)
  6. Click on the "Add to SQL" button to copy the entered values to the "SQL Statement" dialog box below.
  7. Optionally, add to the query string by selecting the 'AND', 'OR' and 'NOT' operators, and/or selecting additional values from the "Operator" and "Value" lists, and again click on the "Add to SQL" button. This will add an additional phrase to the existing query for a more complex query.
  8. If you are familiar with SQL, you may also simply type the query into the "SQL Statement" dialog box.
  9. Click on the "Execute" button to perform the query.
  10. A table displaying database information for the features matching the query is displayed in a new browser window. You can save this data to a text file (comma delimited); you can also zoom in to the selected records by clicking the "Zoom to Records" button, or to a specific selected feature by clicking that feature's hyperlink (presented in the "Map" column).
Spatial Query
A Spatial Query is an example of a "proximity query" whereby the user has the ability to perform a spatial selection, or spatial relationship analysis with other features. It can be used to find features within a specified distance (in units selectable by the user) of currently selected features (e.g. select all of the Rivers within 1000 metres of the selected Geological Province feature(s) boundaries), or to find features that intersect with currently selected features. The "Spatial Query" function will also identify features that are completely contained within currently selected features as well as features of the same type that touch at the features' boundaries.

To select features using a Spatial Query, complete the following:
  1. Select the "Spatial Query" button from the Query menu.
  2. From the "Source Layer" dropdown list, select the layer you wish to base the query on. Selecting on a layer makes that layer the "Active Layer" and loads it in the Map Window if it isn't already.
  3. From the "Selection Type" dropdown list, choose the selection method to be used for identifying the source feature. Options include selection by point, polygon, line and box.
  4. Select the source feature(s) from the Map Window that you wish to use for your spatial query. You may modify your selection results at any time by selecting the buttons below this dropdown to add to, remove from, or clear the current set of selected features.
  5. From the "Spatial Query Type" dropdown list, select the type of query that you wish to perform. A "Contains" query will display all feature(s) from the layer indicated in the "Target Layer" dropdown (as selected by the user) that completely fall within the selected source feature(s). (NOTE: This can be a very time-consuming operation depending on the complexity of the features being queried and the user is advised to be very familiar with the data before running this query). A "Buffer" query will display all feature(s) from the "Target Layer" dropdown that fall (inclusively) within a specified distance of the selected source feature(s). The user may enter a buffer distance in the "Buffer Distance" text field using any of the measurement units available from the "Set Measuring Units" tool under the "Map/View" menu. A "Intersection" query will display all feature(s) from the "Target Layer" dropdown that intersect with the selected source feature(s). Finally, the "Adjacency" query will display all feature(s) (from the same source layer) that touch the currently selected source feature(s). The "Target Layer" dropdown is not active for this type of query operation.
  6. To perform the query operation click on the "Submit" button. The resulting features from the query will be highlighted a different colour in the Map Window from the initial selection.
  7. Select the  "Show Target Attributes" button to open the "Query/Selection Results" window identifying the selected target feature(s).
  8. If you wish to create a new, temporary layer in the Layer List/Legend for the resulting query feature(s), click the "Save as Layer" button, enter a layer name in the new dialog window and click "Submit".

Database Specific Queries

NT GoMap allows you to search, view and download, free of charge, information from the following databases:

Showings Showings is a relational database containing information on mineral occurrences in the Northwest Territories. Showing information is gathered from mineral exploration reports, assessment reports, NTGO publications, and other key publications. Each Showing is cross-referenced to one or more NORMIN References. The Showings database is updated as new information is published or released.

References References is a relational database containing metadata on our library of publications in the Northwest Territories. References include NTGO publications, mineral exploration industry assessment reports, petroleum industry exploration reports, and other miscellaneous geological reports. The References database is updated as new information is published or released.

G-Meta G-Meta is a relational database containing metadata on geophysical and geochemical surveys that have been submitted as digital data in the Northwest Territories. G-Meta is a sub-set of References and includes digital data submitted with assessment reports. Each G-Meta record often contains several survey areas. The G-Meta database is updated as new information is published or released.

Diamonds Diamonds is a collection of two relational databases containing diamond sample information; KIDD (the Kimberlite Indicator and Diamond Database), and KIMC (the Kimberlite Indicator Mineral Chemistry database) in the Northwest Territories and Nunavut. KIDD information is gathered from assessment reports containing kimberlite indicator mineral data which includes sample location and the number of each of a variety of mineral grains found in the sample. KIMC is an extension of the KIDD database, consisting of grain information. For each sample, indicator minerals and their chemical compositions are recorded. The KIDD and KIMC databases are updated as new information is published or released.

KanddKANDD (Kimberlite Anomaly and Drillhole Data ) is a database of publically available kimberlite drillhole data from the Slave Craton, Northwest Territories and Nunavut filed in accordance with the Canada Mining Regulations (initially published as EGS Open Report 2001-005); supplemented by a catalogue of available core and scanned documents made available in NWT Open Report 2003-003; and including all of the publically available kimberlite drillhole data filed with NTGO in the form of various publications (assessment reports, open files, etc.) since 2001 including the extensive catalogue of BHP kimberlite core donated to NTGO in 2009.

Showings Query  -  On the "Showing Query" page, you may search the NORMIN database for mineral showings information according to their locations and geological characteristics. In all likelihood, there are numerous showings in the NWT and Nunavut which haven't yet been discovered, a number which have been discovered but haven't been reported in public records, and many which have been reported but haven't yet been recorded in NORMIN.

References Query  -  On this page, you may search the database for references by area, type or content. Many of the references in NORMIN are exploration assessment reports. Your results will be a list of key reference information, each list item linked to further detailed information. Information about something is called metadata, therefore your results are metadata about the references which meet your search criteria.

G-Meta (Geophysical and Geochemical Surveys Query  -  On this page, you may search our database for survey by area, category or presentation. Your results will be a list of key survey information, each list item linked to reference detailed information. Information about something is called metadata, therefore your results are metadata about the references which meet your search criteria.  The Geoph/Geoch Query presents you with a number of search options.

Diamond Query  -  On this page, you may search our database for KIDD records by area, mineral type, publishing date or reference number and reference type. Your results will be a list of KIDD information, each list item

Kandd Query  -  On the KANDD Query page, you may search our Diamond database for KANDD information according to their locations and characteristics.
 

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Utility Tools

This group of functions provides specific tools to allow you to make more effective use of the mapping environment that NT GoMap supports. Utility tools are provided for common functions such as accessing the layer list, printing, measuring lines and areas on the map, extracting data, viewing help metadata documentation, and similar productivity functions.

Overview Map
When the 'Toggle Overview map' button is selected, a small window is opened in the upper left corner of the Map Window Frame that contains a crude map showing the full extents of the NTGO base dataset. A red rectangle displayed on this Overview Map outlines the extents of the map currently displayed in the Map Window. Selecting the 'Toggle Overview map' button again will hide the overview map.

View Layer List
The 'Layer List' contains additional functionality which allows the user to turn features on or off (make them visible or invisible), set the "Active Layer", view metadata for each layer, reorder a layer, customize the appearance of a layer, and review what layers (features) are displayed.

Active Layer
The NT GoMap allows the user to review information pertaining to the features displayed on the map. In order for you to see the information from a desired feature, that feature must first be selected as the "Active Layer". To make a feature the 'Active Layer' and view its attributes, the following steps must be taken.

  1. Select the the "Layer List" button from the toolbar.
  2. Find the desired feature listed in the Layer List.
  3. Click on the desired layer. It will be highlighted to show that the layer is now "active".
  4. To view the layer's information, from the toolbar, select the "Identify" tool. Click on a feature displayed on the map belonging to the 'Active Layer'.
  5. Any database information regarding that feature will be displayed in a new window.
Visible  
Each user has their own reasons for creating maps. To better represent their own themes, the user will likely wish to turn on or turn off (make visible or invisible) particular features at different times.

To turn on or off a feature layer found in the 'Layer List', complete the following steps:
  1. Select the the "Layer List" button from the toolbar.
  2. Locate the feature layer desired within the 'Layer List' (use the scroll bar to the right of the window or arrow keys to move up or down through the list). Each feature layer contains a checkbox to the left of the feature layer name. Click on the checkbox to toggle the visibility of that layer on and off.
  3. Repeat steps 2 - 3 for as many features as desired.
  4. Click on the "Refresh Map" button located towards the bottom of the 'Layer List'.
  5. The NT GoMap will regenerate a new map with only the selected layers visible.
Change Measuring Units
Use the "Set Measuring Units" function to have measurements taken using the "Measure" tool, and distances shown on the scale bar, displayed using different units. Supported units are feet, miles, meters, and kilometers. To change the measuring units used by NT GoMap, carry out the following steps:
    1. Select the "Set Measuring Units" button from the Map/View menu.
    2. The 'Set Units' form will appear in the Text Frame. Select the desired units of measurement from the 'Display Units' dropdown list.
    3. Click the 'Set Units' button.
    4. The Map Window will refresh. The scale bar will now reflect the new units of measurement.
 Select Projection
Use the "Select Projection" function to set the projection, on the fly, of all information displayed in the Map Window. To set the projection of your displayed data, carry out the following steps:
  1. Select the "Select Projection" button from the Map/View menu.
  2. The 'Set Map Projection' page will appear in a new dialog window or in the right frame.
  3. Select the desired projection from the 'Select Projection' dropdown list.
  4. Click the 'Submit' button.
  5. The Map Window will refresh, displaying the current map information in the selected map projection.
This function does not alter the projection of the actual data files but only that of the map data (temporarily) displayed in the Map Window Frame.

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. Save Map Data
Use the "Save Map Data" function to save selected features to ESRI Shape File format for use in other applications. Follow these steps:

  1. The "Extract Data" function operates by exporting currently loaded layers which can determined by the clicking on the "Add/Remove Layers" button from the Legend area. You must first create a selection set using the "Select" function prior to using the "Extract Data" function. (If you click on the "Extract Data" button without first selecting features, you will see a message informing you that you must select features first.)
  2. Select the "Extract Data" button from the "Output" menu.
  3. The 'Save Map Data' form will appear as a new dialog window.
  4. Select the layer you wish to extract by clicking on the checkbox to the left of the layer name.
  5. Set the projection from the "Select Projection" dropdown list if the current projection is not adequate and then click the 'Download' button.
  6. The "File Download" dialog will appear. Click "Save" and, in the "Save As" dialog window that opens, navigate to the location where you wish to save the file.
  7. Click "Save" to download the file. The Shape file will be downloaded as a compressed file in .ZIP format.

NOTE: If Database layers (Showings, References, G-Meta, Diamonds) are loaded ( using the "Add/Remove Layers" function mentioned above), these too can be extracted or saved to a Shape File. As well, the output zip file can contain reports from these layers if the "Include Reports" checkbox has been clicked on for them in the "Save Map Data" screen.

. Extract Full Layer
Use the "Extract Full Layer" function to download entire layer as ESRI Shape File format for use in other applications. Follow these steps:

  1. The "Extract Data" function operates by exporting currently loaded layers which can determined by the clicking on the "Add/Remove Layers" button from the Legend area. You must first create a selection set using the "Select" function prior to using the "Extract Data" function. (If you click on the "Extract Data" button without first selecting features, you will see a message informing you that you must select features first.)
  2. Select the "Extract Full Layer" button from the "Output"" menu.
  3. The ' Save Entire Layers ' form will appear as a new dialog window.
  4. Select the layer you wish to extract by clicking on the checkbox to the left of the layer name.
  5. Set the projection from the "Select Projection" dropdown list if the current projection is not adequate and then click the 'Download' button.
  6. The "File Download" dialog will appear. Click "Save" and, in the "Save As" dialog window that opens, navigate to the location where you wish to save the file.
  7. Click "Save" to download the file. The Shape file will be downloaded as a compressed file in .ZIP format.

NOTE: IfIf Database layers (Showings, References, G-Meta, Diamonds) are loaded ( using the "Add/Remove Layers" function mentioned above), these too can be extracted or saved to a Shape File. As well, the output zip file can contain reports from these layers if the "Include Reports" checkbox has been clicked on for them in the "Save Entire Layers" screen.

Measure Measure
This tool allows you to measure distances on the map displayed in the 'Map Window Frame'. You can either measure the distance between two points or complete an accumulative distance measure by measuring more than one segment. To complete a measurement, do the following:

  1. Select the "Measure" button from the Standard Toolbar set of tools. The "Measure Distance" form is displayed in the Text Frame showing three measurement text boxes.
  2. Move the cursor to the location on the map you wish to start your measurement.
  3. Click the left mouse button to define the start point. A red dot will appear on the map.
  4. Move the cursor to the location on the map you wish to complete the measurement.
  5. Click the left mouse button again to define the end point. Another red dot will appear on the map and a red line will join the two dots together. The 'Totals' text box field calculates the distance between the two dots.
  6. Repeat steps 2-5 for as many segments as you want.
    (NOTE: The value in the 'Segment' text box field continues to change until you click the left mouse button again. Until then, it continues to display the distance from the last point to the cursor location. As you complete the line the 'Totals' distance is updated to include the line addition just made.
  7. To start a new measurement, select the "Remove Existing" button from the "Measure Distance" form and begin again.
Save Map Image Save Map Image
Use the "Save Image" function to save (download) map images or legend images for use in other applications (for example Microsoft Office). To do this, follow these steps:
  1. Select the "Save Image" button from the Output menu.
  2. The 'Save or Email Map Images' form will appear in the Text Frame.
  3. You can use this form to save either a map image or a legend image - if you want to save both, simply do one and then the other.
  4. Select the delivery method from the "Delivery Options" area.
  5. From the "Image Options" area, choose to save either a Legend Image or a Overview Map Image by selecting the appropriate checkbox.
  6. From the "Format Options" area, choose the appropriate output format for the image you wish to save.
  7. Click on the "Submit" button at the bottom of the frame. This will open the "File Download" dialog window.
  8. Select "Save" and from the "Save As" window that appears, enter the appropriate path and filename for the file you wish to save.
  9. If you wish to email map images, select "Email Images" from the "Delivery Options" area and provide the appropriate information for the recipient of the email. Then follow the same procedure to download and save a Map Image as above.
Layer Metadata
The "Layer Metadata" function provides access to metadata - information about the data displayed - for layers available in your NT GoMap application. This information will differ with each implementation, but generally includes descriptions of the layers available, information about how the data is maintained and by whom, and other similar information that may help you to correctly interpret the data. To view the metadata available for a given layer, carry out the following steps:
  1. Select the "View Layer Metadata" button from the 'Layer' menu.
  2. The 'Layer Metadata' form will appear in a new browser window. This form has 2 frames: the left frame contains a dropdown list to select the layer of interest, while the right frame is used to display the available metadata for the selected layer.
  3. Select the layer for which you wish to view metadata from the "Select Item to Review" expansion list (simply click on the "plus" sign to expand the list). This will cause the right frame to refresh and display the available metadata for that layer.
  4. If no metadata is available for the selected layer a message will be displayed to that effect.
  5. You can also access the Metadata function from the Layer List. Click on the "Layer Properties" button to open the 'Layer Metadata' form.
Help
If you are reading this, you have already figured out what this icon does!

Print
A built in print function allows you to produce a map that contains a title, map (a reproduction of the current map in the 'Map Window Frame') and legend. In order to produce a paper map (or hard copy) perform the following:
  1. Select the ct the "Quick Print" button from the "Output" menu. The 'Text Frame' then presents the 'Print Map' form.
  2. Fill in an appropriate title in the in the "Title to Display on Map:" dialog box.
  3. Fill in an appropriate subtitle in the "Subtitle to Display on Map:" dialog box.
  4. Type in the "Map Notes" dialog box any information you wish included on your printout.
  5. If you would not like a Legend included in the printout, remove the checkmark from the "Add Legend to Map" checkbox.
  6. Click on the "Print" button.
  7. The requested document is presented on the screen for review.
  8. The printer dialog box will appear. IT IS RECOMMENDED THAT YOU SWITCH THE LAYOUT TO LANDSCAPE BY PERFORMING THE FOLLOWING:
    • From the new browser window containing the print preview, select "File", "Page Setup".
    • Select "Landscape" as the Orientation.
    • Click "OK".
  9. To print select "File", "Print".
  10. Click on the "Print" button
    NOTE: This image cannot be scaled to fit on any paper size other than 'Letter'. Even if you change the paper size the image does not expand to fit the paper.

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Glossary

Attributes
Attributes are detailed descriptive information about the geographic features represented on the map. Vector layers depicted in the NT GoMap generally contain tables (rows and columns) of information that is not visible in the Map Window, but can be queried and viewed using functions provided in the NT GoMap. Each feature in a layer is represented by a row in the layer's attribute table; one or more fields (columns)of information is used to describe additional aspects of that feature. For example, a property parcel layer may have fields for owner name, owner address, property identifier, date of last property transfer, and so on. Use NT GoMap tools such as Custom Query, Identify, and Select to view the information available for features.

Buffer
Buffers are used for proximity analysis, and establish a zone of a specified distance around selected features. A buffer operation is carried out after you have selected one or more features, and specified the distance to be buffered and the layer whose features are to be highlighted by the buffer. The resulting buffer zones form polygons that are the specified buffer distance from each feature. For example, you may select a hydrant feature, and create a buffer to select all property parcel features within a distance of 500 metres from that hydrant.

Features
Features are discrete objects on a map. Real world features are generally represented in the NT GoMap as graphical points, lines, and polygons (area shapes) on a map; they may also be represented by continuous surface representations, as with digital aerial photography. Examples of features are hydrants (point), roads (line), and property parcels (polygon). Features are generally grouped into "layers", with all hydrants grouped in one layer, streets in another, and so on. Some operations in the NT GoMap take place on layers - for example turning layers on or off in the Map Window, or querying a layer to find features matching specific criteria; and other operations take place on individual features, such as an "Identify" operation to view the attributes of the feature in question.

Fields
A field (or column) is an "attribute" that is common to all of the features for a category. Each field or column contains the values for each feature in a given layer. For example, a road layer may have fields to capture the road name, road number, surface type, and classification. See "Attribute".

Identify
Each "vector" layer (see "Vector Data and Geometry Types" in a map has a table storing "attributes" (see "Attribute") about the geographic features it contains. A layer's attribute table contains one record for each feature in the layer. (The only layers that do not have attributes are "image" layers - see "Raster or Image Layers"). The identify tool will return the specific feature number, fields, and values for the feature that is clicked on.

Layers
A layer is used to group similar features. Layers available to view in the NT GoMap can be "vector" or "raster" layers (see "Vector Data and Geometry Types" and "Raster or Image Layers"). A layer consists of a collection of geographic features (such as roads, rivers, parcels, wildlife sightings, schools, or parks) and the attributes for those features. Some operations in the NT GoMap take place on layers - for example turning layers on or off in the Map Window, or querying a layer to find features matching specific criteria; and other operations take place on individual features, such as an "Identify" operation to view the attributes of the feature in question.

Mode
The NT GoMap behaves differently depending on the "Mode" that is set at any time. For example, clicking the "Identify" button changes the NT GoMap "Mode" to "Identify"; selecting the "Buffer" button changes the mode to "Buffer"; and so on. These mode changes take place automatically - you do not have to change the mode yourself. The current or active mode is always displayed in the mode frame, in the lower left hand portion of the NT GoMap screen.

Query
The process of retrieving information from layers and features represented in the Map Window by asking spatial or logical questions of the geographic data. There are 2 types of query available through NT GoMap functions. Spatial query is the process of selecting features based on location or spatial relationship (e.g., select all features within 300 feet of another; point at a set of features to select them). Logical query is the process of selecting features whose attributes meet specific logical criteria (e.g., select all polygons whose value for AREA is greater than 10,000 or select all streets whose name is 'Main St.'). Once selected, additional operations can be performed, such as drawing them, creating a buffer around them, listing their attributes or summarizing their attribute values. NT GoMap tools such as Buffer, Identify, Custom Query, and Select are functions that present data resulting from spatial or logical queries.

Raster or Image Layer
Raster data records spatial information in a regular grid or matrix organized as a set of rows and columns. Each cell within this grid contains a number representing a particular geographic feature. Raster data is used to store information about geographic features that vary continuously over a surface, such as elevation, reflectance, groundwater depths, etc. Raster data is highly dependent on the resolution of the regular grid in which it is recorded. The size of the cells in the grid is fixed, so as you zoom in on raster data displayed on a view, you will eventually see the shape of the cells. Image layers do not have attribute tables.

Scalebar
A Map's scale is the relationship between the dimensions of a map and the dimensions of the Earth. Scale can be expressed using a scale bar, as a verbal scale (e.g. 1cm = 7km), or as a ratio (e.g. 1:10 000). The NT GoMap's "Zoom to Map Scale" function uses a ratio scale approach; a ratio scale of 1:10 000 indicates that the Map Window will use 1 unit to represent 10,000 real world units; in other words, one centimetre on the map represents 10,000 centimetres on the ground, 1 inch represents 10,000 inches on the ground, and so on.

The lower right hand corner of the NT GoMap Map Window Frame includes a scale bar which is updated dynamically every time the Map Window is refreshed; the scale bar uses a real world scale to indicate the distance on the ground represented by the length of the scale bar on the map.

Select
When a feature is selected, it is highlighted on the screen. Various means can be used to define the features to be selected. Pointing at features is one means; you can also select by line, box, or polygon shapes which cause the features that are contained by or overlap the line, box or shape you draw to be selected. Features can also be selected as the result of another operation, as with the Buffer or Custom Query functions.

Shape Files
A Shape File is an industry standard file type for representing vector geographical data (see "Vector Data and Geometry Types"). The file format was originally defined by ESRI, a leading Geographical Information Systems (GIS) vendor, but has become a standard means of storing geographical data as point, line, or polygon layers. A Shape File is really a collection of files, including a file that defines each feature's geometry (the .SHP file), a file that defines attribute information for each feature (the .DBF file), and files that define indexes and other aspects of the Shape file data.

Vector Data and Geometry Types
Vector data records spatial information as pairs of coordinates in a rectangular (planar) coordinate system. The Vector data model is best used to locate discrete geographic features with precise locations like streets, parcel boundaries, streams, telephone poles, etc.

There are 3 primary classes of vector data defined by the type of geometry they use. Point features, such as the locations of telephone poles, schools, or water wells, are recorded as single pairs of coordinates (x and y location). Line features, such as roads, watermains, and streams, are recorded as an ordered series of x, y coordinates. Polygon or area features, such as property parcel limits, municipal boundaries, watersheds and sewer catchment areas, are defined by ordered series of x, y coordinates where the first and last pair of coordinates are the same, forming a closed shape.

Each of these geometry types is treated differently in the NT GoMap. In symbolizing point features, for example, only a single colour is specified for the symbol used to represent the point in question; a polygon feature requires that a colour be defined for its boundary, and another to represent its internal "fill" colour (shading).

Shape files, AutoCAD drawing files, ArcSDE and Oracle Spatial data are some of the many examples of Vector data sources.

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