[gdal-dev] Gdal contour number of contour with -p

[Julien Cabieces]

Hi,

I notice that executing gdal_contour has different number of contour
with or without -p option.

gdal_contour  -b 1 -a level -fl 1 -f GPKG NETCDF:"/tmp/myfile.nc":MYVAR
/tmp/outfile.gpkg

This generates one contour line.

gdal_contour  -p -b 1 -a level -fl 1 -f GPKG
NETCDF:"/tmp/myfile.nc":MYVAR /tmp/outfile.gpkg

This generates two contour polygons, one where all values are greater
than 1 and other one where all values are lesser than 1.

I was wondering if it wouldn't be better to generate only one polygon
contour where all values are greater than 1, in order to keep the same
contour number with or without the option.

Regards,

Julien


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