XSAR is a distributed Level 1 Synthetic Aperture Radar (SAR) file reader designed to write efficient distributed processing algorithms with xarray and dask.

It currently handles Level-1 Sentinel-1 and Radarsat-2 data in SAFE format, as found on scihub or PEPS.

XSAR rely on `xarray.open_rasterio`, rasterio and GDAL to read digital_number from SAFE product to return an `xarray.Dataset` object with dask chunks. LUTs are decoded from XML files and applied to digital_number, following official ESA thermal de-noising document and ESA Sentinel-1 Product Specification.

End user can directly use for example sigma0 variable, or the de-noised sigma0 computed from digital_number and by applying relevant LUTs.

Since XSAR rely on dask, it have a small memory footprint: variables are read from file and computed only if needed.