In order to correctly map an earth-image on a sphere i think i need to use polar mapping with an image that uses Equirectangular projection like this: However when i need to correctly map an image that uses Mercator projection , i’m lost as to what to use as cylindrical uvmapping doesn’t undo the size distortions from Mercator. I have used before for something similar if I remember correctly. For one image $400 might be a bit steep though. Can’t remember if the trial lets you save. might be helpful. Have a look for MicroDEM also if my memory serves me right that has a bunch of re-projection features too. Thanks Fabian for your help. I’ve tried MicroDEM but it seems to be a bit outdated, wanting to install turboPascal and what not. I remember making my first algorithms in University with turboPascal, long long time ago. Anyway, I ended up making an approximate deformation map to convert all mercator maps as a sequence. Although not perfect in a technical sense, the results are good enough. Source.