Problem with ground_heading ? - Githubissues

umr-lops / xsar

Synthetic Aperture Radar (SAR) Level-1 GRD python mapper for efficient xarray/dask based processing

https://cyclobs.ifremer.fr/static/sarwing_datarmor/xsar/

MIT License

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Problem with ground_heading ? #149

Open yreynaud opened 1 year ago

yreynaud commented 1 year ago

For Radarsat-2 I used the same function than Sentinel-1 to load heading angle (load_ground_heading). When we compare the results between data already computed on Cyclobs (netcdf files) and data computed by the load_ground_heading function, we notice that values are the same on average.

A first problem is that the range of values is bigger on Cyclobs ground heading than on xsar one (it means that the calculation method isn't the same.
Also, xsar ground heading is rotated; is it the result of a convention?

Here are some comparisons to illustrate the problem :

agrouaze commented 1 year ago

We have to investigate further to say whether or not it is an issue in xsar.