On Sat, Nov 24, 2018 at 5:56 PM Even Rouault <even.roua...@spatialys.com> wrote: > > > This particular NetCDF file, PM10 analysis from CAMS > > http://www.regional.atmosphere.copernicus.eu/, does not have a longitude > > variable, also no subdatasets. Resolution should be 0.1 degrees, but GDAL > > reports > > Pixel Size = (-0.415021467959250,-0.100000003824258) > > because west > east > > > > ok, ncdump on it confirms there's a clean discontinuity, and regular spacing > before and after: > > longitude = 335.05, 335.15,[...], 359.85, 359.95, > 0.04998779, 0.1499939, [...] 44.84998, 44.94998;
ncdump also confirms that longitudes are increasing from west: longitude = 335.05, 335.15 this is correct, while GDAL assumes that longitudes are decreasing from west The discontinuity 359.95, 0.04998779 is not a discontinuity with regard to their location on earth, the spacing is still about 0.1 because 0.04998779 = 360.04998779 > > the netCDF driver could detect and autocorrect this. Should be around line > 3174 of frmts/netcdf/netcdfdataset.cpp I will have a look. Thanks for your very fast feedback! Markus M
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