Assessment of version 4 of the SMAP passive soil moisture standard product

2017 IEEE International Geoscience and Remote Sensing Symposium (IGARSS) Pub Date : 2017-12-01 DOI:10.1109/IGARSS.2017.8127862

P. O’neill, S. Chan, R. Bindlish, T. Jackson, A. Colliander, R. Dunbar, Fan Chen, J. Piepmeier, S. Yueh, D. Entekhabi, M. Cosh, T. Caldwell, J. Walker, Xiaoling Wu, A. Berg, T. Rowlandson, A. Pacheco, H. Mcnairn, M. Thibeault, J. Martínez-Fernández, Á. González-Zamora, E. López-Baeza, F. Uldall, M. Seyfried, D. Bosch, P. Starks, C. H. Collins, J. Prueger, Z. Su, R. Velde, J. Asanuma, M. Palecki, E. Small, M. Zreda, J. Calvet, W. Crow, Y. Kerr

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引用次数: 6

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.

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SMAP被动土壤水分标准产品第4版的评估

NASA的土壤湿度主被动(SMAP)任务于2015年1月31日发射，进入与太阳同步的早上6点/下午6点轨道，目标是每2-3天生成高分辨率的全球土壤湿度和冻融状态地图。SMAP辐射计于2015年3月31日开始获取常规科学数据，并继续名义上运行。SMAP的辐射计衍生的标准土壤湿度产品(L2SMP)利用亮度温度观测和辅助数据，在36公里的固定地球网格上提供土壤湿度估计。2015年10月发布了L2SMP的beta质量版本，2016年5月发布了第3版验证的L2SMP土壤湿度数据，2016年12月发布了第4版L2SMP数据。版本4数据使用与以前版本相同的土壤湿度检索算法进行处理，但现在包括从上午6点下降轨道和下午6点上升轨道检索的土壤湿度。对19个月的标准L2SMP产品进行了验证，使用全球核心cal/val站点的原位测量进行AM和PM检索。核心站点土壤水分反演的平均精度表明，SMAP精度基本满足要求。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2017 IEEE International Geoscience and Remote Sensing Symposium (IGARSS)

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