Interpolations listed in wcs getCapabilites but not implemented

[lubojr]

• cubic, cubic-spline, lanczos and mode interpolations are listed in wcs getCapabilities, but not supported when asked by getCoverage

[constantinius]

This issue is due to the disparity of the two coverage renderer implementations: the rectified coverage renderer from MapServer, and the referenceable one using GDAL. The GDAL one supports the additional ones, the MapServer one does not. This issue will remain until the MapServer renderer is finally replaced by a GDAL one.

[Schpidi]

So I propose to simply not advertise the non-existent interpolations then.

[constantinius]

That is the point. They exist, but just for one internal path of the two possible ones. We could only advertise the ones available for all