First a disclaimer, I'm not very fluent in GIS language and terms, so apologies if I use wrong terms etc.

Task: A couple of years ago, I had the task of making image overlays for google, using UTM coordinates + color info. I did this by making a simple bitmap using the UTM coordinates and colored each pixel in the desired color. Then I transformed this image using gdalwarp.

gdalwarp -q -s_srs EPSG:32632 -t_srs EPSG:4326

Worked perfectly for our needs.

Problem: Now I have the same task, but this time the info for creating the image files is given in WGS84 instead of UTM. How do I best accomplish this task. Do I convert WGS84 -> UTM, then do "as-last-time" or is there a more elegant solution for creating the image directly from WGS84?

Needs to be open source, preferably Python or Python/command, for automation.

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