TMI被动微波遥感资料用于地表洪涝特征分析试验  

The Application of TMI Polarization Ratio PR in Flooded Area Detecting and Classification

作　　者：谷松岩[1,2] 高慧琳[1] 朱元竞[1] 李万彪[1] 赵柏林[1] 

机构地区：[1]北京大学物理学院大气科学系 [2]国家卫星气象中心,北京100081

出　　处：《遥感学报》2004年第3期261-268,共8页NATIONAL REMOTE SENSING BULLETIN

基　　金：国家自然科学基金 ( 90 10 2 0 10 );国家重点基础研究项目G2 0 0 0 0 4870 3的共同资助

摘　　要：星载被动微波遥感资料为云天条件下地表洪涝特征分析提供了可能。微波极化比 (PR)可以有效刻画地表洪涝特征 ,宏观反映地表湿度信息。正演模拟分析结果表明地表粗糙度、地表植被覆盖状况和地表湿度对上行微波亮温有影响 ;TRMM/TMI低频微波通道微波极化比能减弱大气因素的影响 ,清晰反映地表的洪涝特征。合理确定分类阈值 ,对 1 998年长江流域洪涝区进行地表洪涝特征分析 ,可以在TMI像元尺度 ,将洪涝区分类为不同等级。洪涝区分类结果与经过天 -地校验过的机载和星载SAR资料地表洪涝分类实况对比 ,TRMM/TMI低频微波通道微波极化比 1 0GHz的PR1 0和 1 9GHz的PR1 9的分类正确率不低于 75 %。By using a radiative transfer model for simulation of microwave brightness temperatures over land surface, the effects of canopy and roughness on passive microwave soil moisture retrieval results have been analyzed. In order to reduce the influence of atmosphere, surface temperature, roughness and canopy, microwave polarization ratio of TRMM/TMI was employed and we got a good result when put the polarization ratio of TRMM/TMI into the use of surface flood area detection and classification. When practied our method over Dongting and Boyang lake area of China in the summer of 1998, the classification results of Radarsat SAR and L SAR surface flood area were used, and we got a Vol./Cal. over 75 0%. Low frequency channels of TRMM/TMI at 10GHz and 19GHz, were effectual in surface flood area detection and classification.

关 键 词：星载被动微波 微波极化比 地表洪涝特征 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]