opera-adt / DSWX-SAR

Dynamic Surface Water Extent from Synthetic Aperture Radar
Apache License 2.0
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re-define the dark land areas #38

Closed oberonia78 closed 9 months ago

oberonia78 commented 9 months ago

This PR updates the dark land areas. The dark land was extracted from several ancillary data. Since the only co-polarization image (i.e. VV) shows the boundary between the water and dark land, the algorithm selects the only co-polarization for fuzzy value computation without cross polarizations. This is because the cross-polarization does not show a distinct boundary.

In contrast, the cross-pol is less affected by the bright-water issue. So, only a cross-polarization image is used to compute the fuzzy value where the areas are highly guaranteed.

The previous version was not clear in defining the dark land and water. This PR updates the dark land /water in fuzzy logic computation step.