Retrieving Soil Moisture from TRMM/TMI
利用TRMM／TMI资料提取地表层湿度信息试验

Remote sensing of soil moisture by microwave radiometry has been a subject of intensive studies in the past two decades. Following the studies done before, a new approach to retrieve surface layer soil moisture is accomplished in this paper, in which the passive microwave data of TRMM/TMI and ground observation data have been used to retrieve surface soil moisture. Surface and atmosphere microwave radiance transfer models have been applied to analyze the effects of surface and atmosphere, e. g. scan angle, surface roughness, and canopy layer. In the retrieval technique for TMI low frequency, variable gain and intercept appeared. Multi-spectrum remote sensing information, surface digital elevation measurement data, and mixed-pixel information were involved. The consistency was obtained between the retrieval results and ground observation or HUBEX IOP data.