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Using the Linear Line of Sight
Release 9.3
Last modified December 4, 2009		 E-mail This Topic Printable Version Give Us Feedback

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About using the Linear Line of Sight

The LLOS operates on DTED catalogs and surface raster datasets. It determines the visibility, based on the elevation, of all the points in a straight line on a surface between specified observer and target points and generates a line shapefile to display this information. The portions of the line that are hidden from the view of the observer are displayed in red, while the portions that are visible are displayed in green. If 3D Analyst is installed, the LLOS will generate a profile graph of the line, which represents a side view of the relief along the line between the observer and the target. It will also display a message in the status bar indicating whether the target is visible. The output shapefiles are saved in the Terrain Analysis working directory.


How to use the Linear Line of Sight

  1. Enable the Military Analyst extension.
  2. Install and enable ArcGIS 3D Analyst.
  3. Add the Military Analyst toolbar.
  4. Create and load a DTED or raster surface dataset catalog.
  5. Add the DTED catalog or raster surface dataset to ArcMap.
    6. Note that for the LLOS function to work, a raster surface dataset must contain elevation values.
  6. Click the Military Analyst menu and click Linear Line of Sight.
  7. Click the Input surface drop-down list and click the layer that will be used in the analysis.
  8. Click the Coordinate Tool button in the Start Point Parameters frame to open the Coordinate Tool dialog box.
  9. Type the observer coordinates into the appropriate field in the Coordinate Tool dialog box and click Convert or click the desired location in the data frame.
  10. Repeat step 3 for the End Point Parameters frame.
  11. Type the desired values in the Offset text boxes for the start and endpoints.
    12. Military Analyst uses the values in the Offset text boxes to raise the heights of the start and endpoints for analysis.
  12. Click OK.

Tip

  • You must have a valid surface layer, such as a DTED catalog, displayed in ArcMap to activate the LLOS.
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