Geodesic intersection

[Even Rouault]

Hi,

Mostly a FYI, but this might be of interest for a more precise 
ST_Intersection() on geography. Charles Karney published last year a 
paper on how to compute the intersection of 2 geodesics on the ellipsoid 
(https://arxiv.org/pdf/2308.00495) and has an implementation of it in 
https://github.com/geographiclib/geographiclib/blob/main/include/GeographicLib/Intersect.hpp 
. For arbitrary geometry intersection, a probably not super efficient 
approach would be to test all pairs of (edge_first_geom, 
edge_second_geom), see if they intersect using GeographicLib, add the 
intersection point to the edges, and then use the standard intersection.

Even

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