摘要
提出了利用ENVISAT/ASAR/AP模式VV极化的低入射角数据和黄土高原陆面过程试验资料对黄土高原平凉试验区表层土壤湿度进行反演的方法。结果表明:在相对平坦的混合地表类型区域,反演的土壤湿度与地面实测值平均误差<0.02 cm3.cm-3,绝对误差均在0.04 cm3.cm-3范围内,该结果能较好地对黄土高原塬区土壤湿度进行干旱监测;但在陡峭山坡及塬边等地形起伏较大的区域,结果较差。
Using the ENVISAT/ASAR AP mode VV polarization observation data at a low incidence angle and ground measured soil moisture collected from the land surface process experiment Loess Plateau of,which was conducted in the summer of 2005（LOPEX05）,an algorithm for estimating the land surface soil moisture over LOPEX05 area was developed.The validated results indicate that the average difference soil moisture between the estimated from microwave remote sensing and ground measurements is less than 0.02 cm^3·cm^-3,the maximum difference is less than 0.04 cm^3·cm^-3.And the developed algorithm was applied to the surface soil moisture mapping,the results show that it is potential to monitor drought on the agricultural fields over the Chinese Loess Plateau,when the land coverage mixed with small farm fields and the imagery data resolution are taken into accounted.However big differences are not acceptable for surface soil moisture estimation over the steep slope region,the edge of mesa and building groups region.Thus,further work on surface soil moisture retrieval will be investigated in the future.
出处
《高原气象》
CSCD
北大核心
2008年第2期279-285,共7页
Plateau Meteorology
基金
中国科学院百人计划项目(2004406)
中国科学院资源环境领域野外台站研究基金项目“黄土高原陆-气相互作用的初步观测试验研究”共同资助
作者简介
张堂堂（1977-），男，山西兴县人，博士研究生，主要从事微波遥感与陆面过程研究．E—mail：ttzhang@lzb．ac．cn
