Hi Michael,
I guess this is finally the perfect use case we were waiting for to find
a good reason to embed a Small Language Model within GDAL to figure out
what are the columns and lines axis. In the meantime, the boring
https://github.com/OSGeo/gdal/pull/12700 will fix it
Even
Le 04/07/2025 à 00:48, Michael Sumner via gdal-dev a écrit :
I'm confused about the orientation of this in 2D mode 1485x1272 is
correct, with 122 bands.
(requires earthdata auth)
gdal raster info
"/vsicurl/https://obdaac-tea.earthdatacloud.nasa.gov/ob-cumulus-prod-public/PACE_OCI.20250501T234515.L2.SFREFL.V3_0.nc";
--output-format text | grep /rhos
#
SUBDATASET_1_NAME=NETCDF:"/vsicurl/https://obdaac-tea.earthdatacloud.nasa.gov/ob-cumulus-prod-public/PACE_OCI.20250501T234515.L2.SFREFL.V3_0.nc":/geophysical_data/rhos
# SUBDATASET_1_DESC=[1485x1272x122] /geophysical_data/rhos (32-bit
floating-point)
If we drill into the rhos sds X becomes unrolled as the 1485 bands:
gdal raster info
"vrt:///vsicurl/https://obdaac-tea.earthdatacloud.nasa.gov/ob-cumulus-prod-public/PACE_OCI.20250501T234515.L2.SFREFL.V3_0.nc?sd_name=/geophysical_data/rhos";
--output-format text | grep "Size"
#Size is 122, 1272
We can (redundantly??) cast via mdim to get 1485x1272, but then we've
lost the geolocation arrays:
gdal raster info
"vrt:///vsicurl/https://obdaac-tea.earthdatacloud.nasa.gov/ob-cumulus-prod-public/PACE_OCI.20250501T234515.L2.SFREFL.V3_0.nc?transpose=/geophysical_data/rhos:0,1";
--output-format text | grep "Size"
#Size is 1485, 1272
At any rate in the default case the geolocation arrays don't match the
data orientation.
Cheers, Mike
--
Michael Sumner
Ordinary Member, Streets People Love Hobart Association
Research Software Engineer
Australian Antarctic Division
Hobart, Australia
0438489030
e-mail: mdsum...@gmail.com
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