For another wind estimation processor that use similar code as xsar, I noticed an issue with ancillary data in the resulting product. I investigated and found that map_raster would interpolate ancillary data incorrectly.
The problematic section of the map_raster is :
https://github.com/umr-lops/xsar/blob/develop/src/xsar/base_dataset.py#L922C1-L933C18
I could confirm that this section yield incorrect results by forcing to go through the first section of the "if" block, and observed radically different results.
Going through the first part of the "if" block (xarray interp) - OK :
Going through the second part (RectBivariateSpline) - NOT OK :
I investigated further and finally tested using an older version of dask package.
Using dask=2025.3.0 fix the issue without modifying the code.
Going through the second part (RectBivariateSpline) with dask=2025.3.0 - OK :
Short term fix :
Pin to dask 2025.3.0
EDIT : dask 2025.7.0 works fine too.
Long term fix :
For each xsar releases, pin important dependencies, at carefully tested versions
For another wind estimation processor that use similar code as xsar, I noticed an issue with ancillary data in the resulting product. I investigated and found that map_raster would interpolate ancillary data incorrectly.
The problematic section of the map_raster is :
https://github.com/umr-lops/xsar/blob/develop/src/xsar/base_dataset.py#L922C1-L933C18
I could confirm that this section yield incorrect results by forcing to go through the first section of the "if" block, and observed radically different results.
Going through the first part of the "if" block (xarray interp) - OK :
Going through the second part (RectBivariateSpline) - NOT OK :
I investigated further and finally tested using an older version of dask package.
Using dask=2025.3.0 fix the issue without modifying the code.
Going through the second part (RectBivariateSpline) with dask=2025.3.0 - OK :
Short term fix :
Pin to dask 2025.3.0
EDIT : dask 2025.7.0 works fine too.
Long term fix :
For each xsar releases, pin important dependencies, at carefully tested versions