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

This enhanced Level-2 (L2) product contains calibrated, geolocated, brightness temperatures acquired by the Soil Moisture Active Passive (SMAP) radiometer during 6:00 a.m. descending and 6:00 p.m. ascending half-orbit passes. This product is derived from SMAP Level-1B (L1B) interpolated antenna temperatures. Backus-Gilbert optimal interpolation techniques are used to extract maximum information from SMAP antenna temperatures and convert them to brightness temperatures, which are posted to the 9 km Equal-Area Scalable Earth Grid, Version 2.0 (EASE-Grid 2.0) in a global cylindrical projection.本增强型二级（L2）产品包含土壤湿度主动被动（Soil Moisture Active Passive, SMAP）辐射计在上午6时降轨与下午6时升轨半轨过境期间获取的经定标、地理定位的亮温数据。本产品衍生自SMAP一级（L1B）插值天线温度数据。研究采用巴克斯-吉尔伯特最优插值（Backus-Gilbert optimal interpolation）技术，从SMAP天线温度数据中提取最大信息量，并将其转换为亮温数据，随后将这些亮温数据发布至采用全球圆柱投影的9公里等面积可缩放地球网格2.0版（Equal-Area Scalable Earth Grid, Version 2.0, EASE-Grid 2.0）。