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DOI10.1109/JSTARS.2016.2628523
Dynamic Characterization of the Incidence Angle Dependence of Backscatter Using Metop ASCAT
Hahn, Sebastian; Reimer, Christoph; Vreugdenhil, Mariette; Melzer, Thomas; Wagner, Wolfgang
通讯作者Hahn, Sebastian
来源期刊IEEE JOURNAL OF SELECTED TOPICS IN APPLIED EARTH OBSERVATIONS AND REMOTE SENSING
ISSN1939-1404
EISSN2151-1535
出版年2017
卷号10期号:5页码:2348-2359
英文摘要

Observing a target from different look and incidence angles is one of the key features of the Advanced Scatterometer (ASCAT) on-board the series of Metop satellites. The incidence angle dependency of backscatter plays an important role in extracting useful information for the retrieval of geophysical parameters. The TU Wien change detection algorithm exploits the multiangle measurement capabilities of ASCAT to retrieve relative surface soil moisture content. In the TU Wien algorithm, the incidence angle dependence of backscatter is characterized with a second-order polynomial and its coefficients are estimated from several years of data due to robustness. Recently, however, it has been shown by Melzer [1], that a kernel smoother (KS) holds promise to characterize the polynomial coefficients on an interannual basis. In this study, we tested the performance and robustness of the KS globally, by comparing the results obtained from ASCAT on-board Metop-A and Metop-B independently. Overall, a good agreement has been found between Metop-A and Metop-B confirming a robust interannual estimation of the incidence angle dependence of backscatter using the KS. However, in two cases, the prevailing conditions on the ground complicated the estimation: areas with very low signal variation and sandy deserts. An analysis of Hovmoller diagrams provided insight into seasonal variations, also revealing small remaining biases between the instruments. The dynamic characterization of the incidence angle dependence of backscatter allows to study the temporal evolution in more detail and, at the same time, moving a step further on the vegetation correction in the TU Wien soil moisture algorithm.


英文关键词Performance evaluation radar remote sensing radar cross sections soil moisture
类型Article
语种英语
国家Austria
收录类别SCI-E
WOS记录号WOS:000406418700022
WOS关键词LAND SCATTEROMETER DATA ; SOIL-MOISTURE ; ERS SCATTEROMETER ; SPACEBORNE SCATTEROMETERS ; SATELLITE SCATTEROMETER ; SEAWINDS ; ICE ; CALIBRATION ; VALIDATION ; QUIKSCAT
WOS类目Engineering, Electrical & Electronic ; Geography, Physical ; Remote Sensing ; Imaging Science & Photographic Technology
WOS研究方向Engineering ; Physical Geography ; Remote Sensing ; Imaging Science & Photographic Technology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/199569
作者单位Vienna Univ Technol, TU Wien, Dept Geodesy & Geoinformat, A-1040 Vienna, Austria
推荐引用方式
GB/T 7714
Hahn, Sebastian,Reimer, Christoph,Vreugdenhil, Mariette,et al. Dynamic Characterization of the Incidence Angle Dependence of Backscatter Using Metop ASCAT[J],2017,10(5):2348-2359.
APA Hahn, Sebastian,Reimer, Christoph,Vreugdenhil, Mariette,Melzer, Thomas,&Wagner, Wolfgang.(2017).Dynamic Characterization of the Incidence Angle Dependence of Backscatter Using Metop ASCAT.IEEE JOURNAL OF SELECTED TOPICS IN APPLIED EARTH OBSERVATIONS AND REMOTE SENSING,10(5),2348-2359.
MLA Hahn, Sebastian,et al."Dynamic Characterization of the Incidence Angle Dependence of Backscatter Using Metop ASCAT".IEEE JOURNAL OF SELECTED TOPICS IN APPLIED EARTH OBSERVATIONS AND REMOTE SENSING 10.5(2017):2348-2359.
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