Retain vertical CRS information

[chambbj]

CODEM is dropping any vertical CRS information that is present in the input files. The vertical CRS of the registered product should be inherited from the foundation DSM.

[j9ac9k]

To follow up on this, it appears that codem retains the vertical CRS information if it is recognized by gdalinfo, but does not recognize it if it's set as a GeoTIFF key (where listgeo recognized it).