SMAP L2 Radiometer Half-Orbit 36 km EASE-Grid Soil Moisture, Version 2

This Level-2 (L2) soil moisture product provides gridded estimates of global land surface conditions retrieved by the Soil Moisture Active Passive (SMAP) passive microwave radiometer during 6:00 a.m. descending half-orbit passes. Input SMAP L-band brightness temperature data used to derive soil moisture are resampled to an Earth-fixed, global, cylindrical 36 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 soil texture and vegetation opacity.

Note: These data are Beta-release quality, meaning that they have not undergone full validation and may still contain 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）被动微波辐射计在每日上午6时降轨半圈过境时段内反演得到的全球陆面状态网格化估算值。用于反演土壤湿度的SMAP L波段亮温数据，已被重采样至地球固定的全球圆柱等面积可扩展网格2.0版（EASE-Grid 2.0）。同时还将多种辅助数据作为输入项，例如土壤质地与植被不透明度(vegetation opacity)。注意：本数据为Beta测试版质量，即尚未经过完整验证，仍可能存在显著误差。