This value sets the treshold when groundlevel of Above Sea Level (ASL) is used for RF predictions.

Fix_Elev_Thr.dat
<height>
<comment>

Variables:

Variable Comment
height Height in meters
comment

this text:

If the antenna height is greater or equal to the value in the line above, the antenna height value will be considered as the elevation above sea level instead of being the height above ground.

Sample file

mapfile.dat
2000
If the antenna height is greater or equal to the value in the line above,
the antenna height value will be considered as the
elevation above sea level instead of being
the height above ground.