Which of the SMAP Passive Soil Moisture products are the best one?

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Natalia S Duxbury

That's a great mission. They will provide data about permafrost as well.

Liming He

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

Avinash Kumar Ranjan

I would recommend the answer of lining...VV is better than HH