But probably implies local adjustments? That would explain some discrepancies in scale I am seeing. In theory I should have 5 meters per pixel but end up having to say 7 for a better match.
All these local adjustments will render my automation quite difficult. Ideally, I would like to cover an area that is roughly 250km x 250km... So probably viking converts lat/lon to UTM, and then just uses the georef map as if it is the right zone. I think what you need to do is to find the upper left pixel in WGS84 UTM. Check out the following program - probably viking should use it at some point, but it's the standard approach to coordinate conversion in the open source world: http://trac.osgeo.org/proj/
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