کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4526315 | 1323828 | 2008 | 11 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Passive L-band microwave soil moisture retrieval error arising from topography in otherwise uniform scenes Passive L-band microwave soil moisture retrieval error arising from topography in otherwise uniform scenes](/preview/png/4526315.png)
Soil moisture is an important component of the water cycle and will be measured for the first time on a global scale by a dedicated passive L-band microwave radiometer that is planned for launch in 2008. Here, the contribution of topography to the error budget is examined for a vegetated scene with uniform microwave emission. Dual-polarization brightness temperature curves were generated over a range of look angles for 1-D scenes with simple geometrical features, and the soil moisture was retrieved assuming a flat surface. The errors were small for the scenarios considered. Theoretical errors were tested for realistic topography with a DEM transect of a mountainous region, and were found to be comparable. Knowledge of the mean slope from high-resolution DEM data can be used to improve the accuracy of the retrieval.
Journal: Advances in Water Resources - Volume 31, Issue 11, November 2008, Pages 1433–1443