Simultaneous estimation of soil moisture and surface roughness using microwave scattering theory with multi incident angle and multi polarization

基于数值散射模型和野外试验，探讨了水稻作物冠层下地表状况监测的可能性。结果表明，C波段入射角小于25 °，L波段入射角在10 ° ~ 50 °之间，可以探测到冠层下的地表情况，因此，冠层下的地表情况监测是可能的，但目前还没有合适的业务SAR卫星。利用多幅遥感图像融合技术制作了泰国稻田地区的陆面湿度图，并进行了多角度、多波段微波散射仪获取陆面湿度的野外试验。在裸地和草地上进行了人工草地化试验，观测了植被指数、土壤含水量和粗糙度。利用TRMM/PR卫星资料对全球陆面状况进行了研究，利用TRMM/PR卫星资料对全球陆面状况进行了季节性分析，并利用TRMM/PR卫星资料对全球陆面状况进行了多角度的观测，通过对全球TRMM/PR卫星资料的季节性分析，可以探测到陆面状况，特别是陆面湿度。

The possibility of monitoring of the groud surface condition under the rice crop canopy is investigated based on a numerical scattering model and field experiments. It is found that the ground surface condition under the canopy can be detected at the incident angle of less than 25 degree at C-band and at the incident angle between 10 and 50 degree at L-band.Therefore it is possible to monitor the ground surface condition under the canopy, but suitable operational SAR satellite is not available now.In addition, a land surface wetness map of rice-paddy region in Thailand is made using several remotely sensed images with data-fusion technique.Field experiments for capturing land surface wetness using microwave scatterometer with multi incident angle and multi-porlarization have been carried out at a bare soil field and a grassland.Vegetation indices, soil moisture and roughness length have been observed in the experiments. Analysis using these obtained data has been carried out in order to relate soil moisture with other surface parameters.Global land surface condition is investigated to utilize TRMM/PR data.TRMM/PR is used as a satellite microwave scatterometer with multi incident angles for land surface observation in this research.Land surface condition and, in paticular, land surface wetness can be detected in the seasonal analysis of global TRMM/PR data.