Retrieving soil moisture from simulated brightness temperatures by a neural network

Yuei An Liou, Shou Fang Liu, Wen June Wang

研究成果: 雜誌貢獻期刊論文同行評審

54 引文 斯高帕斯(Scopus)

摘要

We present the retrievals of surface soil moisture (SM) from simulated brightness temperatures by a newly developed error propagation learning back propagation (EPLBP) neural network. The frequencies of interest include 6.9 and 10.7 GHz of the advanced microwave scanning radiometer (AMSR) and 1.4 GHz (L-band) of the soil moisture and ocean salinity (SMOS) sensor. The land surface process/radiobrightness (LSP/R) model is used to provide lime series of both SM and brightness temperatures at 6.9 and 10.7 GHz for AMSRs viewing angle of 55°, and at L-band for SMOS's multiple viewing angles of 0°, 10°, 20°, 30°, 40°, and 50° for prairie grassland with a column density of 3.7 km/m 2. These multiple frequencies and viewing angles allow us to design a variety of observation modes to examine their sensitivity to SM. For example, L-band brightness temperature at any single look angle is regarded as an L-band one-dimensional (1-D) observation mode. Meanwhile, it can be combined with either the observation at the other angles to become an L-band two-dimensional (2-D) or a multiple dimensional observation mode, or with the observation at 6.9 or 10.7 GHz to become a multiple frequency/dimensional observation mode. In this paper, it is shown that the sensitivity of radiobrightness at AMSR channels to SM is increased by incorporating L-band radiobrightness. In addition, the advantage of an L-band 2-D or a multiple dimensional observation mode over an L-band 1-D observation mode is demonstrated.

原文???core.languages.en_GB???
頁(從 - 到)1662-1672
頁數11
期刊IEEE Transactions on Geoscience and Remote Sensing
39
發行號8
DOIs
出版狀態已出版 - 9月 2001

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