[postgis-users] Measuring distances between two 3D points using SRID 4326

[Felix Filozov]

When measuring distances, using ST_3DDistance for example, between two 3D
points (set with SRID of 4326), is it necessary to project these points onto
a flat surface before measuring the distance? After which, I assume,
ST_3DDistance
computes the Euclidean distance between the projected X and Y coordinates
and the unprojected Z coordinates.

The manual seems to support my assumption, but I'd like somebody to confirm
that.

Thanks.

Felix
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