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Importing DLG Files

Created by the USGS, digital line graph (DLG) files are digital representations of cartographic data. These files are vector representations of maps either derived from photographs or digitized maps.

To open, place, or import a DLG file:

  1. Choose File | Open or Place, or GIS | Import.
  2. Select DLG/DO/OPT as file type.

    3. DLG files can have either .DLG, .DO, or .OPT as an extension.

  3. Navigate to the .DLG file and click Open or Place.

    4. In the DLG-0 Import Options dialog box, select your settings.

  4. Click OK.

DLG-O Import Options dialog box

Files/Layers

This list indicates all the files that you are opening or placing. The map objects that are contained in the file are indicated to the right (Point, Line, Area).

Add/Remove

Click the Add button to open or place another file. To delete a file from the list, select the file in the list and click the Remove button.

Projection

Click this button to open the File Coordinate System dialog box.

Properties

Select a map object (Point, Line, Area) and click this button to open the Layer Properties dialog box.

Move Up/ Move Down

Use these buttons to shuffle the files within the list.

Auto Define Document Coordinate System

Select this check box so Canvas sets up the projected coordinate system for the file.

If this check box is deselected and you click OK, the Document Coordinate System dialog box opens. This dialog box has the same projection options as the GIS manager.