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comments of
Maik Heistermann
Just in case anybody still lands here...it appears that the above exception can occur in case the path to the file is wrong or not correctly formatted. So you might...
First step would be to transform the 3D DEM coordinates into polar coordinates "as seen" from the radar, right? Like an analogon to [sat2pol](http://wradlib.org/wradlib-docs/latest/generated/wradlib.georef.satellite.sat2pol.html#wradlib.georef.satellite.sat2pol), or an "inverse" to [polar2lonlatalt_n](polar2lonlatalt_n). Then...