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i.albedo: add Sentinel-2 broadband albedo support - #7935
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Adds a -s flag computing broadband shortwave albedo from Sentinel-2 surface reflectance (B2, B3, B4, B8, B11, B12), using the narrow-to-broadband conversion coefficients of Bonafoni & Sekertekin (2020), IEEE Geosci. Remote Sens. Lett. 17(9):1618-1622, doi:10.1109/LGRS.2020.2967085. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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Summary
-sflag toi.albedoto compute broadband shortwave albedo from Sentinel-2 surface reflectance bands (B2, B3, B4, B8, B11, B12), alongside the existing MODIS/AVHRR/Landsat/ASTER modes.bb_alb_sentinel2()inbb_alb_sentinel2.c, following the existing per-sensor function pattern (bb_alb_landsat.c,bb_alb_landsat8.c, etc.).i.albedo.md) updated: description, NOTES on expected band order/scaling, a worked EXAMPLE, and a REFERENCES entry for the new coefficient source.Test plan
make MODULE_TOPDIR=$HOME/dev/grassfromimagery/i.albedo/.i.albedo -son synthetic single-value Sentinel-2 band rasters (B2=0.05, B3=0.08, B4=0.06, B8=0.35, B11=0.20, B12=0.10) and confirmed the output (0.177031) matches the hand-computed weighted sum exactly.i.albedo's other sensor modes either; happy to add one if maintainers want it as part of this PR.Co-Authored-By: Claude Sonnet 5 noreply@anthropic.com