학술논문
Assessment of version 4 of the SMAP passive soil moisture standard product
Document Type
Conference
Author
O'Neill, P.; Chan, S.; Bindlish, R.; Jackson, T.; Colliander, A.; Dunbar, S.; Chen, F.; Piepmeier, J.; Yueh, S.; Entekhabi, D.; Cosh, M.; Caldwell, T.; Walker, J.; Wu, X.; Berg, A.; Rowlandson, T.; Pacheco, A.; McNairn, H.; Thibeault, M.; Martinez-Fernandez, J.; Gonzalez-Zamora, A.; Lopez-Baeza, E.; Udall, F.; Seyfried, M.; Bosch, D.; Starks, P.; Holifield, C.; Prueger, J.; Su, Z.; van der Velde, R.; Asanuma, J.; Palecki, M.; Small, E.; Zreda, M.; Calvet, J-C.; Crow, W.; Kerr, Y.
Source
2017 IEEE International Geoscience and Remote Sensing Symposium (IGARSS) Geoscience and Remote Sensing Symposium (IGARSS), 2017 IEEE International. :3941-3944 Jul, 2017
Subject
Language
ISSN
2153-7003
Abstract
NASA's Soil Moisture Active Passive (SMAP) mission launched on January 31, 2015 into a sun-synchronous 6 am/6 pm orbit with an objective to produce global mapping of high-resolution soil moisture and freeze-thaw state every 2–3 days. The SMAP radiometer began acquiring routine science data on March 31, 2015 and continues to operate nominally. SMAP's radiometer-derived standard soil moisture product (L2SMP) provides soil moisture estimates posted on a 36-km fixed Earth grid using brightness temperature observations and ancillary data. A beta quality version of L2SMP was released to the public in October, 2015, Version 3 validated L2SMP soil moisture data were released in May, 2016, and Version 4 L2SMP data were released in December, 2016. Version 4 data are processed using the same soil moisture retrieval algorithms as previous versions, but now include retrieved soil moisture from both the 6 am descending orbits and the 6 pm ascending orbits. Validation of 19 months of the standard L2SMP product was done for both AM and PM retrievals using in situ measurements from global core cal/val sites. Accuracy of the soil moisture retrievals averaged over the core sites showed that SMAP accuracy requirements are being met.