Probably my SRS was wrong, my historical maps are in EPSG:3819, but I needed to convert this coordinates to EPSG:23700, wich has wrong parameters in open source softwares (I have to add to the proj.4 format of EPSG:23700 the following towgs parameter: '+towgs84=52.684,-71.194,-13.975,-0.312,-0.1063,-0.3729,1.0191') and my maps longitude counts from El-Hierro (not from Greenwich).
After the transforming process, I had to cut off the frame of the maps. When I tried to figure out how to do this, I released the geotransform starting point is far away from the real starting point (in qgis). Now I am on holyday, but the next week I think, I can reproduce this error. Best regards, Balazs 2011/8/9 Vadim Shlyakhov <vadp.d...@gmail.com> > On Mon, Aug 8, 2011 at 6:42 PM, Balazs Szabó <szabo...@gmail.com> wrote: > > > I tried the .GCPsToGeoTransform() method, and it is ok, but in the > > geotransform tuple (geotransform[0],geotransform[3] ) gave me fake > starting > > point. > > Frankly speaking, this is a bit strange if your raster is linear and > you have a proper set of GCPs and SRS. But it shouldn't matter if you > are going to use GCP-based warp, so you could drop > .GCPsToGeoTransform() altogether. >
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