[Waterluvian]

I've done this kind of stuff through a point and click UI in GIS software. It's really cool seeing a lot of the underlying math and concepts laid out like this.

[parsecs]

I'm curious - what did you do, in what software, and how?

[ecommerceguy]

ESRI software has had this raster function for quite a while, at least 20 years. Usually 2 or 3 points would suffice. Using hundreds of points was unnecessary.

[wizzwizz4]

Hundreds of points lets you get a good average. 2 or 3 requires that you've definitely clicked the same point on both images; a human can use other bits of the image to work that out, but a computer finds it harder.

[zokier]

I think what he is referring to is georeferencing and reprojecting, you can read how it works in e.g. QGIS here https://docs.qgis.org/3.16/en/docs/user_manual/working_with_...

[Waterluvian]

Georeferencing processes of various complexity in ArcGIS, PCI Geomatica, and ENVI.