NDLI: Impact of terrain topography on retrieval of snow water equivalence using passive microwave remote sensing

Content Provider	IEEE Xplore Digital Library
Author	Pei Wang Lingmei Jiang Lixin Zhang Ying Guo
Copyright Year	2010
Description	Author affiliation: The Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology of Chinese Academy of Sciences, Shijiazhuang 050021, China (Ying Guo) \|\| State Key Laboratory of Remote Sensing Science, Jointly Sponsored by Beijing Normal University and the Institute of Remote Sensing Applications of Chinese Academy of Sciences,Beijing,100875, China (Pei Wang; Lingmei Jiang; Lixin Zhang)
Abstract	The current algorithms of retrieval of snow water equivalence (SWE) using passive microwave remote sensing is based on the linear brightness temperature difference. In the mountain areas, the topography affects the microwave signal received by the microwave radiometer by ways of changing the elevation and the radiation between the terrains. Accordingly it can exert some certain influences on the result of SWE using the current algorithms of the retrieval of SWE. In this paper, Guo's terrain correction algorithm (2009) of passive microwave remote sensing is applied to correct the brightness temperature globally at AMSR-E's frequencies which are used in the current algorithms of the retrieval of SWE. We evaluated the terrain impact on brightness temperature at 18.7 GHz and 36.5 GHz at each polarization and polarization difference, respectively. From our analysis, we could see that: at the global scale, Guo's terrain correction algorithm is sensible to the changes of the topography on brightness temperature; the influence of the terrain on the passive microwave brightness temperature is similar with at 18.7 GHz and 36.5GHz.The vertical polarization channels are apt to be greater than zero while the horizontal ones to be less than zero. From the analysis of Guo's terrain correction on Tb at 18.7 GHz and 36.5 GHz, brightness temperature differences of the same polarizations are better combination compared to that of the different polarizations. Most of the difference of SWE estimated on Jan. 2, 2009 after terrain correction could be 14 mm, and the maximum difference is up to 40mm.
Starting Page	1757
Ending Page	1760
File Size	364257
Page Count	4
File Format	PDF
ISBN	9781424495658
ISSN	21537003
e-ISBN	9781424495665
e-ISBN	9781424495641
DOI	10.1109/IGARSS.2010.5652279
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-07-25
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Snow Brightness temperature Histograms Passive microwave remote sensing Surface topography snow water equivalence (SWE) passive microwave remote sensing terrain correction
Content Type	Text
Resource Type	Article

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