Elevation handling
The surface of the earth has to be modeled for geometrics functions localization and rectification. Two types of earth model are available :
constant elevation over ellipsoid
DEM which represents the surface of the earth
DEM
DEM is a 2.5D representation of the surface of the earth.
Limitations
nodata are not (yet) handled in shareloc.geofunctions.DTMIntersection code. Thus a filling strategy should be set when using nodata DTM. This can be done by setting fill_nodata arg in shareloc.geofunctions.DTMIntersection. Filling strategy examples can be found in test test_dtm_image