> Interpolation of the geoid grid is done by PROJ itself, and this is > > bilinear interpolation > > Awesome, good to know. Is there anyway of configuring this?
Depends on your definition of configuring. As it is open source, everything is somehow configurable. Here changing the lines of code starting at https://github.com/OSGeo/PROJ/blob/master/src/grids.cpp#L3226 :-) But people seem to be generally happy with bilinear interpolation. -- Spatialys - Geospatial professional services http://www.spatialys.com
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