[gdal-dev] How do GCP's in a VRT file work?

[Joe Lovick]

This is really informative and makes perfect sense..... makes my life a 
lot harder, but perfect sense

If I Could i ask a follow on question to this,

        What is the recommended processing paradigm for slightly 
off-nadir imagery where their is a need for a full [3x3] matrix mapping 
to take it to a consistent projection? ie the images have at a minimum 
perspective effects.

     the reason i ask, is i have a significant image pile that needs 
this re-projection to remove camera lens + perspective effects , to map 
it to a consistent conformal projection? Can i do this with gdal_warp? 
or do i need to code this up, and then go from their once their is just 
a rotation / scale left.

Many thanks

Joe


On 2023-11-29 09:37, Greg Troxel via gdal-dev wrote:
> The basic point is that this process is starting from a belief that the
> imagery is consistent and needs only translation, scaling, and rotation.
> That's not quite true, as a general matrix multiply is looser than a
> rotation and scale, having 4 variables vs 2.
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