Photogrammetry is indeed an interesting subject. Over the years(!), I've tried
to imaging how it could be done in SDL (using two stereo photos of a scene, not
one, egads!)

My fuzzy idea would use eval_pigment to compare pixels or blocks of same, then
find what the horizontal/vertical pixel distance *differences* are at various
points in the photos, then somehow use that info to discern where in 3D space
those 'matching' pixels correspond to. With some arbitrary scaling in z
involved. Of course, I'm assuming that the original camera is looking straight
ahead, not up or down. That might complexify things.(?)

A very basic idea, I admit, and without any fancy 'edge-finding' stuff.

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