Description
When using the Line of Sight tool, the Curvature option is not enabled.
Cause
Specific criteria are not being met for the Curvature option to enable.
Note:
This information only pertains to ESRI GRIDs.
Solution or Workaround
Ensure that the following criteria are met:
- The surface must have a spatial reference. Check for spatial reference by right-clicking on the image > Properties > Source tab > Spatial Reference.
- The surface must be in a projected coordinate system.
- The Z units of the surface must be defined.
Summary:Instructions provided describe how to define Z units for a GRID.
Procedure:Follow the steps below:
- Open Windows Explorer.
- Navigate to the location of the GRID.
- Open the folder with the name of the image.
- Right-click on 'prj.adf' > Open with... > select Notepad or Wordpad.
- Of interest is the ZUNITS parameter. It may be absent or set to a value of 'NO' or 'NONE'. Change this to FEET, METERS, or a floating point value which represents units per meter.
- Save the changes. The Z units are now defined.