I have a file with a projection shown, using REPORT_COMPD_CS=TRUE of:
COMPOUNDCRS["WGS 84 / UTM zone 17N + unknown",
PROJCRS["WGS 84 / UTM zone 17N",
BASEGEOGCRS["WGS 84",
DATUM["World Geodetic System 1984",
ELLIPSOID["WGS 84",6378137,298.257223563,
LENGTHUNIT["metre",1]]],
PRIMEM["Greenwich",0,
ANGLEUNIT["degree",0.0174532925199433]],
ID["EPSG",4326]],
CONVERSION["UTM zone 17N",
METHOD["Transverse Mercator",
ID["EPSG",9807]],
PARAMETER["Latitude of natural origin",0,
ANGLEUNIT["degree",0.0174532925199433],
ID["EPSG",8801]],
PARAMETER["Longitude of natural origin",-81,
ANGLEUNIT["degree",0.0174532925199433],
ID["EPSG",8802]],
PARAMETER["Scale factor at natural origin",0.9996,
SCALEUNIT["unity",1],
ID["EPSG",8805]],
PARAMETER["False easting",500000,
LENGTHUNIT["metre",1],
ID["EPSG",8806]],
PARAMETER["False northing",0,
LENGTHUNIT["metre",1],
ID["EPSG",8807]]],
CS[Cartesian,2],
AXIS["easting",east,
ORDER[1],
LENGTHUNIT["metre",1]],
AXIS["northing",north,
ORDER[2],
LENGTHUNIT["metre",1]],
ID["EPSG",32617]],
VERTCRS["unknown",
VDATUM["unknown"],
CS[vertical,1],
AXIS["up",up,
LENGTHUNIT["metre",1,
ID["EPSG",9001]]]]]
When trying to gdalwarp to EGM2008 using gdalwarp -t_srs
epsg:32617+3855, vertical datum reprojection does not occur unless I
overwride the source srs with -s_srs epsg:32617. Using GDAL 3.6.2 and
proj 9.1.1. With proj_debug, I can see that the PROJ_TRACE:
vgridshift: is not occurring unless the srs is overridden. I’m fairly
sure that this has worked in the past but I can’t say exactly which
version. This is an older geotiff that was written about 7 years ago.
--
Michael Smith
US Army Corps / Remote Sensing GIS Center
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