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I would like to use QGIS for the documentation of mural paintings (so I don't need georeferecing) I would like to set my own scale from a raster file (measure a know distance and use it as reference). I'm reading the manual but I don't find how to do that... Thanks a lot!

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I'm trying to set a user defined projection system usig proj4. I wonder which is the best CRS for a 2D surface.... –  G M Jan 25 '13 at 21:56

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