Hi all, I would like to use QGIS for surfaces documentation (in my case: mural painting...). My main problem is to set a scale to the raster file. Of course I have no latitude or longitude, however, I'm using the georeferencer plugin to "georeference" the raster, because if I don't "georeference" the image, I can't use others plugin such Polygonize plugin...) but It's quite difficult because I have to use a trigonometric trick to convert the parameters in distance. I tried to set a user defined coordinate system more closer to a plane using the proj4 guidelines, but all my attempts to simplify the matter fails. What can I do? Are there any other methods to set a user scale and set a very very user defined coordinate system? Thanks a lot!
Best regards, Giacomo Marchioro
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