Estimating long term surface soil moisture from satellite microwave observations in Illinois, USA

被引：0
|
作者：
Owe, M. [1 ]
De Jeu, R. [1 ]
van de Griend, A. [1 ]
机构：
[1] NASA/Goddard Space Flight Center, Greenbelt, Maryland 20771, United States
来源：
IAHS-AISH Publication | 2000年 / 267期
关键词：
Interpolation - Microwaves - Moisture - Radiometers - Remote sensing - Vegetation - Weather satellites;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
A database of long-term soil moisture was compared to satellite microwave observations over a test site in the midwestern United States. Night-time microwave brightness temperatures were observed at a frequency of 6.6 GHz by the Scanning Multichannel Microwave Radiometer (SMMR). At 6.6 GHz, the instrument provides a spatial resolution of approximately 150 km, and a temporal frequency over the test area of about two to three night-time orbits per week. Vegetation radiative transfer characteristics, such as the canopy transmissivity, were estimated from vegetation indices such as the NDVI and the MPDI. Because the time of satellite coverage does not always coincide with the ground measurements of soil moisture, the existing ground data were used to calibrate a water balance for the top 10 cm surface soil layer in order to interpolate daily surface moisture values. Passive microwave remote sensing presents the greatest potential for providing regular spatially representative estimates of surface soil moisture at global scales.
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页码：394 / 399
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