The NASA Soil Moisture Active Passive (SMAP) Produce Soil Moisture Product in HH, VV and dual polarization.
Which of these products are the best one? Which of these products are suitable in rangelands?
That's a great mission. They will provide data about permafrost as well.
Soil moisture product from VV is the best, per the mission's validation:
S. K. Chan et al., "Assessment of the SMAP Passive Soil Moisture Product," in IEEE Transactions on Geoscience and Remote Sensing, vol. 54, no. 8, pp. 4994-5007, Aug. 2016.
doi: 10.1109/TGRS.2016.2561938
I would recommend the answer of lining...VV is better than HH
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