Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1109/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
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ISSN | 1939-1404 |
EISSN | 2151-1535 |
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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