Maybe out of left field but is one implementation working in double and the other one working in float?
On Thu, Sep 4, 2025 at 1:50 PM Cory Foy via gdal-dev <gdal-dev@lists.osgeo.org> wrote: > > > I apologize. I'm not familiar with the GetExtent() function. So this is > > just a guess and feel free to ignore it. Given that GetExtent() reports 2 > > coordinates, it seems to describe an axis aligned bounding. GeoTransform() > > provides information to describe an oriented bounding box. Could this > > perhaps be the source of disagreement between the two routines? > > Thanks David. I realize now what’s going on is GetExtent and GetGeoTransform > are returning different values than the command line gdalinfo is. > > For example, running gdalinfo on my PDF shows: > > GeoTransform = > -8800981.741226587, 1.534954250051887, 0.7153177546590841 > 4288851.899958452, 0.7158702972076904, -1.534439284842128 > > Corner Coordinates: > Upper Left (-8800981.741, 4288851.900) ( 79d 3'38.03"W, 35d54'51.91"N) > Lower Left (-8800543.967, 4287912.823) ( 79d 3'23.87"W, 35d54'27.31"N) > Upper Right (-8799766.057, 4289418.869) ( 79d 2'58.72"W, 35d55' 6.76"N) > Lower Right (-8799328.283, 4288479.792) ( 79d 2'44.56"W, 35d54'42.16"N) > Center (-8800155.012, 4288665.846) ( 79d 3'11.30"W, 35d54'47.03”N) > > But calling it from my compiled version in the app on the same file gives me: > > GeoTransform = > -8800981.488120455, 1.5351602235290571, 0.7144694099544626, > 4288852.103036083, 0.7156171000026056, -1.5347947295515767 > > And an extent of [-8800981.488120455, -8799328.385944527, 4287912.808661598, > 4289418.871779285] > > All of which is _close_ but obviously not the same. Gdalinfo is the correct > representation, so I’m not sure why I’m getting the data I’m getting from my > compiled version. They’re both from 3.11. But that explains why I was so > confused. > > Thanks for at least giving it a look and guess - going to have to figure out > why these are getting different values. > > Cory_______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > https://lists.osgeo.org/mailman/listinfo/gdal-dev _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/gdal-dev
