Hi Agustin, > Please see the screenshot here: > https://sites.google.com/site/filestemp2/home/error_georef.jpg?attredirects > =0 > > We've tried polynomia of order 1 and 2 and Helmert, with very similar > results. CRS is ED50 UTM31N > > I've uploaded the input layer and points file to: > https://sites.google.com/site/filestemp2/home/Ilerfly125v2.tif?attredirects > =0&d=1 > https://sites.google.com/site/filestemp2/home/Ilerfly125v2.tif.points?attr > edirects=0&d=1 >
thanks for your test case. I did a quick test reprojection, but couldn't see a problem with the georeferencer output, i.e. the coordinates generated by the transform fit the destintaion coordinates within a few pixels, putting the max. error somewhere in the ballpark of 1.5m. This relies on the destination coordinates being in ED50 UTM31N. The georeferencer has no support for transforming the destination coordinates, so they need to be specified in the destination CRS. I suspect the discrepancy you are seeing might be a problem with the WGS84<->ED50 datum transformation, so it would be helpful if you could provide the ArcGIS output as well. > Here you have an screenshot of the comparison to the same image > georeferenced with ARCGIS (left) > https://sites.google.com/site/filestemp2/home/errorgeorefARCG_QGIS.jpeg?att > redirects=0&d=1 > https://sites.google.com/site/filestemp2/home/errorgeorefARCG_QGIS.jpegw?a > ttredirects=0&d=1 I guess you meant to say that the right one is from ARCGIS? cheers, Manuel
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