LOS Options

To set these values, LOS Right click options or use the "Modify, LOS Parameters" menu choice.

Gallery showing effects of individual parameters

In the process of being reorganized

The user can adjust the following parameters for the line of sight profile:

  • Color visible/masked: the profile can show terrain visible to the observer in different colors.
  • Draw LOS: the program can connect the observer and target, showing what blocks or nearly blocks the line of sight.
  • Label multiple LOS
  • Line width: in pixels for the LOS line.
  • Earth curvature algorithm: select how vertical curvature is computed.  The program will not allow vertical curvature on very long profiles (such as those with the ETOPO5 and GTOPO30 data sets) where curvature dominates topographic changes.  
  • Height observer: height of the observer above the ground, in meters.
  • Height target: height of the observer above the ground, in meters.
  • Fresnel zone: you can show Fresnel zones for radio wave propagation beyond the direct line of sight; if selected, the zones depend on the radio frequency in Mhz.
  • Closest distance to block LOS (m)
  • Missing data blocks LOS: DEM holes can either be ignored for computations, or automatically block the LOS.  Holes are bad, and there is no single good solution.
  • Show pitch: show the pitch on the title bar, and the min/max pitch of the sensor.
  • Show masked airspace: 
  • Show slope protractor: Puts a legend in the upper left corner with the slope, corrected for the vertical exaggeration.
  • Show observer masking circle: this distance is set on masked antenna height, and if this option is selected, a circle will be drawn on the map.
  • Show LOS data base: the program creates a data base with the results of each LOS profile.  You can display this for advanced GIS operations on the database.
  • Adjust sensor pitch:
  • OpenGL settings. These affect the OpenGL picked on the LOS Right click options
    • Show LOS line
    • OpenGL LOS line parameters
  • Vegetation effects

To change vertical exaggeration, change the size of the window using standard Windows commands (like dragging a corner of the window). Note vertical exaggeration will be indicated on the window title bar.

Last revision 8/3/2012