Sebastian,
I can reproduce the 2 error messages you got. There's indeed something
in QGIS that tries a terrestrial reprojection and should be fixed, but I
don't think this is really critical apart of the annoyance of being
spammed about that. Please file a QGIS issue to track this. That said, I
managed to do a non-Earth reprojection by adding a custom CRS with the
following WKT definition:
GEOGCRS["MARS Geographic",
DATUM["D_MARS",
ELLIPSOID["MARS",3396000,0,
LENGTHUNIT["metre",1,
ID["EPSG",9001]]]],
PRIMEM["Reference meridian",0,
ANGLEUNIT["degree",0.0174532925199433,
ID["EPSG",9122]]],
CS[ellipsoidal,2],
AXIS["longitude",east,
ORDER[1],
ANGLEUNIT["degree",0.0174532925199433,
ID["EPSG",9122]]],
AXIS["latitude",north,
ORDER[2],
ANGLEUNIT["degree",0.0174532925199433,
ID["EPSG",9122]]]]
and selecting it as the project CRS. Using ESRI:104905 (GCS_Mars_2000)
seems to also work (I haven't deeply checked but I do get a reprojected
raster and geographic coordinates), but you'll get each time the
warnings about the 2 terrestrial coordinate operations. Hopefully in
coming months, I'll be able to ingest the IAU catalog into the PROJ
database as well.
Even
Le 18/03/2021 à 21:07, Sebastian Walter a écrit :
Hi,
Since Version 3.X I'm not able to perform transformations on planetary
(non-Earth) data (from e.g. Mars or Mercury, example dataset:
https://maps.planet.fu-berlin.de/mex4/h1104_0000.ihs.53.tif). The
error message is:
No transform is available between SINUSOIDAL MARS and Custom CRS:
GEOGCRS["unknown",DATUM["unknown",ELLIPSOID["WGS 8….
proj_create_operations: Source and target ellipsoid do not belong to
the same celestial body
No transform available between SINUSOIDAL MARS and EPSG:4326
The consequence is that transformations to lat/lon are not possible
any more. With the older QGis there was no problem like this. My
suspect is the "new" Proj6 database layout, but the above error
messages also point to the fact there there is some EPSG:4326
projection hard-coded into Qgis.
Is anybody successfully using Qgis with non-Earth data and proper
transformations?
Thanks for any advise...
Sebastian
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