[gdal-dev] NetCDF config option for west > east?

[Markus Metz]

I have created a PR for this, but there are still issues:

is
Pixel Size = (0.099999991285714,-0.100000004000000)
Corner Coordinates:
Upper Left  ( -25.0000122,  69.9999970)
Lower Left  ( -25.0000122,  29.9999954)
Upper Right (  44.9999817,  69.9999970)
Lower Right (  44.9999817,  29.9999954)
Center      (   9.9999847,  49.9999962)

should be
Pixel Size = (0.100000000000000,-0.100000000000000)
Corner Coordinates:
Upper Left  ( -25.0000000,  70.0000000)
Lower Left  ( -25.0000000,  30.0000000)
Upper Right (  45.0000000,  70.0000000)
Lower Right (  45.0000000,  30.0000000)
Center      (  10.0000000,  50.0000000)

Markus M

On Sat, Nov 24, 2018 at 6:24 PM Markus Metz <markus.metz.giswork at gmail.com>
wrote:

>
>
> On Sat, Nov 24, 2018 at 5:56 PM Even Rouault <even.rouault at 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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