SMAP (Soil Moisture Active and Passive) is one of the Earth observation satellites of the United States, which has active sensors and passive sensors. The active sensor is an L-band radar, and the passive sensor is an L-band microwave radiometer. The vegetation optical thickness is derived from SMAP Class 1C (L1C) interpolated brightness temperature. Backus Gilbert optimal interpolation technology is used to extract information from SMAP antenna temperature and convert it into brightness temperature. These temperatures are published in the form of global cylindrical projection to 9 km equal product expandable earth grid version 2.0 (EASE Grid 2.0). By 2021, these data will also be released to the Northern Hemisphere EASE Grid 2.0,
SMAP_ L3_ SM_ P_ E_ Yyyymmdd.tif, where yyyy represents the year, mm represents the month, and dd represents the day
P. O’NEILL P. O’neill . (2022). SMAP Vegetation Optical Depth Data in Southwest China (2015-2022). Upper Yangtze River Scientific Data Center, (Download the reference：
Related Literatures:1. O'Neill, P. E., S. Chan, E. G. Njoku, T. Jackson, R. Bindlish, J. Chaubell, and A. Colliander. (2021). SMAP Enhanced L3 Radiometer Global and Polar Grid Daily 9 km EASE-Grid Soil Moisture, Version 5 [Data Set]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/4DQ54OUIJ9DL. Date Accessed 10-05-2022.( View Details | Bibtex)
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| East: 112.50 | West: 97.00 |
|---|---|
| South: 20.50 | North: 34.50 |
