[postgis-users] Calculating line of sight

[Greg Troxel]

Also, for distances of more than a few km, you should take earth
curvature into account.  I am unclear on how that's handled in postgis.
Perhaps if you convert each point to X,Y,Z then straightforward 3D
calculations will be right.   But using a projected coordinate system
such as UTM and elevations will be off.
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