Problem with Running WRF_Hydro_Regridding_Spatial_Weights.py – Empty spatialweights.nc Output

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Aref Farhangmehr

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Aug 3, 2025, 11:30:21 AMAug 3

to wrf-hydro_users

Dear WRF-Hydro Team,

We am trying to use the bucket_loss option for calibration in WRF-Hydro (version 5.3), but we understand that this requires UDMP=1, which means we need a valid spatialweights.nc file.

To generate this file, we used the WRF_Hydro_Regridding_Spatial_Weights.py script. The script runs without errors and creates the file spatialweights_out.nc, but the output has empty variables. It seems the geo_em.nc file and the shapefile do not have overlap (I am not sure!).

It is worth to mention that when I load both the shapefile and the geo_em.nc file into ArcMap, they clearly overlap.

All required code and files are attached.

Do you know what could be causing this?

Thank you in advance.

Best regards,
Aref

loss.rar

zed li

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Sep 2, 2025, 8:51:19 AMSep 2

to wrf-hydro_users, Aref Farhangmehr

Hello,Aref

I hope this message finds you well. Sorry to bother you with this, but I'm having some trouble running the WRF_Hydro_Regridding_Spatial_Weights.py script and was hoping you might be able to offer some guidance.

I've been encountering an error that says: "TypeError: in method 'Geometry_Transform', argument 2 of type 'OSRCoordinateTransformationShadow *'". Interestingly, I get the same error even when using your script and input files directly.

I did some searching online and it seems this might be related to the GDAL package version. Would you be able to share which version of GDAL you were using when you successfully ran the script? I believe this information could really help me resolve the issue.

I also wanted to ask about how you prepared the input shp file. I generated the basn_msk raster using ArcGIS with the wrf_hydro_arcgis_preprocessor tool, and then exported it to a shp file. I was wondering if this approach is appropriate, or if there might be a better way to create the required shp file.

Thank you so much for your time and help. I truly appreciate any advice you might be able to offer.

Best regards,

Zed Li

Fatemeh Shirkhanloo

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Sep 2, 2025, 6:39:01 PMSep 2

to wrf-hyd...@ucar.edu, ddlw...@gmail.com, Aref Farhangmehr

Hi Zed,

Regarding to modules for running WRF_Hydro_Regridding_Spatial_Weights.py script successfully please install these :

conda
–version



conda create -n gdal_env python=3.10 gdal netCDF4 numpy -c conda-forge



conda activate gdal_env



python -c "from osgeo import gdal, ogr, osr; print('GDAL loaded
successfully')"



conda install -c conda-forge libgdal-netcdf



then if you are submitting a job, add this section to your job script on HPC: 

# Load conda
environment

source ~/.bashrc

conda activate gdal_env

cd
/home/fatemehs/WRB/wrf_hydro_arcgis_preprocessor-master

python3
WRF_Hydro_Regridding_Spatial_Weights.py


Best regards,
Fatemeh

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Aref Farhangmehr

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Sep 3, 2025, 7:57:58 AMSep 3

to zed li, wrf-hydro_users

Hi Zed

I am using the GDAL version of 3.8.5 and the python version of 3.10.18 .

All installed libraries in the conda environment are listed at the end of the email.

Regarding shapefile, I remember it needs a minor modification. I had the shapefile of the basin and just added "GRIDCODE" field in the shapefile Attribute Table using arcGIS/QGIS with a value of 1.

Hope it helps.

Regards;

Aref

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zed li

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Sep 3, 2025, 10:57:33 PMSep 3

to wrf-hydro_users, Aref Farhangmehr, wrf-hydro_users, zed li

Hi Aref,

Thank you so much for your helpful response!
The GDAL and Python version information you provided was exactly what I needed. I have now successfully set up the environment, and the script ran without any issues—generating both the Model_grid.tif and spatialweights_out.nc files.

I really appreciate your guidance on the shapefile modification as well.

Thanks again for your kind support!

Best regards,
Zed Li

zed li

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Sep 5, 2025, 6:00:38 PMSep 5

to wrf-hydro_users, Fatemeh Shirkhanloo

Hi Fatemeh,

Thank you so much for your detailed and helpful response!
I really appreciate you taking the time to share the exact environment setup and job submission instructions.

I followed the steps you provided and have successfully configured the software environment. Your guidance was incredibly valuable and made the process smooth and straightforward.

Thanks again for your kind assistance!

Best regards,
Zed Li

Fatemeh Shirkhanloo

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Sep 5, 2025, 6:00:43 PMSep 5

to zed li, wrf-hydro_users

Hi Zed,

Happy to hear that worked.
Good luck.

cheers,
Fatemeh

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