[gdal-dev] Understand Why a netCDF4 File Is Not Supported

[Rahkonen Jukka]

Hi,

Ogrinfo seems to open the file.

-Jukka Rahkonen-

Lähettäjä: gdal-dev <gdal-dev-bounces at lists.osgeo.org> Puolesta Scott Smith via gdal-dev
Lähetetty: torstai 1. syyskuuta 2022 19.04
Vastaanottaja: gdal-dev at lists.osgeo.org
Aihe: [gdal-dev] Understand Why a netCDF4 File Is Not Supported

Hi All,

I am trying to work with some SMOS data, specifically the netCDF4 files from https://smos-diss.eo.esa.int/oads/access/<https://eur06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fsmos-diss.eo.esa.int%2Foads%2Faccess%2F&data=05%7C01%7Cjukka.rahkonen%40maanmittauslaitos.fi%7Cc25e0b0ca843423558f608da8c33a3d2%7Cc4f8a63255804a1c92371d5a571b71fa%7C0%7C0%7C637976450669051916%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=SJapG8IICE%2BWs%2BRDqSyza9pXnAPCzh0uczKPzoFtYNs%3D&reserved=0>.

Running gdalinfo or gdal_translate using the Docker image osgeo/gdal:ubuntu-full-latest on these netCDF4 files seems to fail with

ERROR 4: '<file>' not recognized as a supported file format.

Full command and output

docker run -v /local/directory/containing/file/:/mnt/data/ osgeo/gdal:ubuntu-full-latest gdalinfo --debug ON /mnt/data/SM_OPER_MIR_SMUDP2_20220101T001713_20220101T011034_700_001_1.nc

GDAL_netCDF: driver detected file type=3, libnetcdf detected type=3
GDAL_netCDF: No UNIDATA NC_GLOBAL:Conventions attribute
GDAL_netCDF: var_count = 72
GDAL: GDALOpen(/mnt/data/SM_OPER_MIR_SMUDP2_20220101T001713_20220101T011034_700_001_1.nc, this=0x55cdea7bac30) succeeds as netCDF.
GDAL: GDALClose(/mnt/data/SM_OPER_MIR_SMUDP2_20220101T001713_20220101T011034_700_001_1.nc, this=0x55cdea7bac30)
GDAL: GDALOpen(/mnt/data/SM_OPER_MIR_SMUDP2_20220101T001713_20220101T011034_700_001_1.nc, this=0x55cdea7bac30) succeeds as netCDF.
GDAL: GDALClose(/mnt/data/SM_OPER_MIR_SMUDP2_20220101T001713_20220101T011034_700_001_1.nc, this=0x55cdea7bac30)
ERROR 4: `/mnt/data/SM_OPER_MIR_SMUDP2_20220101T001713_20220101T011034_700_001_1.nc' not recognized as a supported file format.
gdalinfo failed - unable to open '/mnt/data/SM_OPER_MIR_SMUDP2_20220101T001713_20220101T011034_700_001_1.nc'.

>From this I'm not really able to understand what is wrong with the file.

The file with which I am testing is available here: https://drive.google.com/file/d/1r4R2gy0w2nyEv1fwmMNNR8CHhwjvayIk/view?usp=sharing<https://eur06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdrive.google.com%2Ffile%2Fd%2F1r4R2gy0w2nyEv1fwmMNNR8CHhwjvayIk%2Fview%3Fusp%3Dsharing&data=05%7C01%7Cjukka.rahkonen%40maanmittauslaitos.fi%7Cc25e0b0ca843423558f608da8c33a3d2%7Cc4f8a63255804a1c92371d5a571b71fa%7C0%7C0%7C637976450669208186%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=IhJTrg4lnBCIABpwpwTKiKBA3rJF0B%2FcLvIz%2BrOpqjM%3D&reserved=0>

I am trying to figure out what is "wrong" with these files which render them unreadable by gdal. I have not managed to find much by Googling. I'm happy to continue investigating if anyone is happy to provide any pointers to where I should be looking.

Any advice, pointers or help would be greatly appreciated.

Many Thanks
Scott Smith
Open Cosmos

p.s. I'm not sure if this is relevant or helpful, but I have managed to have some partial success with an older version of gdal and some "single variable" files I created from the original. Included for information, the gdal version is   GDAL 3.3.2, released 2021/09/01   and a file which worked with gdalinfo is https://drive.google.com/file/d/1r4R2gy0w2nyEv1fwmMNNR8CHhwjvayIk/view?usp=sharing<https://eur06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdrive.google.com%2Ffile%2Fd%2F1r4R2gy0w2nyEv1fwmMNNR8CHhwjvayIk%2Fview%3Fusp%3Dsharing&data=05%7C01%7Cjukka.rahkonen%40maanmittauslaitos.fi%7Cc25e0b0ca843423558f608da8c33a3d2%7Cc4f8a63255804a1c92371d5a571b71fa%7C0%7C0%7C637976450669208186%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=IhJTrg4lnBCIABpwpwTKiKBA3rJF0B%2FcLvIz%2BrOpqjM%3D&reserved=0> .


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