SMAP L2 Radar/Radiometer Half-Orbit 9 km EASE-Grid Soil Moisture, Version 2

This Level-2 (L2) soil moisture product provides gridded estimates of global land surface conditions retrieved by both the Soil Moisture Active Passive (SMAP) radar and radiometer during 6:00 a.m. descending half-orbit passes. Input SMAP L-band backscatter and brightness temperature data used to derive soil moisture are resampled to an Earth-fixed, global, cylindrical 9 km Equal-Area Scalable Earth Grid, Version 2.0 (EASE-Grid 2.0). A variety of ancillary data are also used as input, such as surface temperature, vegetation water content (VWC), and soil texture. Note: These data are Beta-release quality, meaning that they have not undergone full validation and may stillcontain significant errors.本二级（L2）土壤湿度产品提供了由土壤湿度主动被动（Soil Moisture Active Passive, SMAP）卫星的雷达与辐射计，在每日早6时降轨半圈次过境观测中反演得到的全球陆面状态网格化估算结果。用于反演土壤湿度的SMAP L波段后向散射与亮温数据，已重采样至地球固定的全球圆柱等面积可缩放网格2.0版（EASE-Grid 2.0），空间分辨率为9千米。本次处理还使用了多种辅助数据作为输入，例如地表温度、植被含水量（VWC）以及土壤质地。 注：本数据为Beta测试版质量，即尚未经过全面验证，仍可能存在显著误差。