Arid
MONITORING OF SOIL MOISTURE DYNAMICS IN THE SEMI-ARID TROPICS BY MEANS OF ALOS-2/PALSAR-2 DUAL-POLARIZATION SCANSAR DATA
Koyama, Christian N.1; Watanabe, Manabu1; Shimada, Masanobu1,2
通讯作者Koyama, Christian N.
会议名称38th IEEE International Geoscience and Remote Sensing Symposium (IGARSS)
会议日期JUL 22-27, 2018
会议地点Valencia, SPAIN
英文摘要

In the dry tropical forest and semi-arid savanna information about the soil moisture dynamics and distribution are vital to better understand and mitigate damages caused by drought. To estimate the soil moisture over large areas from 50-m resolution ALOS-2 ScanSAR data, we adopt dual-polarization L-band algorithms originally developed for high resolution ALOS data. Based on the partial-polarimetric eigenvector decomposition, the scattering entropy and alpha angles are employed to correct for the above ground vegetation effects. The large incidence angle variation along the 350-km ScanSAR swath requires the use of an incidence angle correction factor. However, due to the relative poor data quality of the ScanSAR products suffering from scalloping and near-range/far-range striping along the subswathes, we observe lower accuracies than Stripmap mode. While in the dry season soil moisture retrieval in the open forest is well possible, in the rainy season the entropy exceeds the validity range due to the larger amounts of canopy biomass resulting in unreliable soil moisture estimates. Savanna vegetation allows a biomass-corrected soil moisture estimation throughout the whole year. Due to the lack of distributed in-situ data, we use coarse scale SMOS and SMAP soil moisture data to validate the accuracy of dual-polarization ScanSAR soil moisture estimates. Comparisons between the kilometer-scale radiometer derived soil moisture estimates and 50-m ALOS-2 results show a good agreement in the dry season with RMSEs smaller 5 Vol.-%, while in the rainy season the RMSEs can be as high as 15 Vol.-%.


英文关键词Dry tropical forest JJ-FAST Lband soil moisture polarimetry
来源出版物IGARSS 2018 - 2018 IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMPOSIUM
ISSN2153-6996
出版年2018
页码5513-5516
EISBN978-1-5386-7150-4
出版者IEEE
类型Proceedings Paper
语种英语
国家Japan
收录类别CPCI-S
WOS记录号WOS:000451039805092
WOS关键词RETRIEVAL
WOS类目Engineering, Electrical & Electronic ; Geosciences, Multidisciplinary ; Remote Sensing
WOS研究方向Engineering ; Geology ; Remote Sensing
资源类型会议论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/307255
作者单位1.TDU, Sch Sci & Engn, Hatoyama, Saitama 3500394, Japan;
2.EORC, JAXA, 2-1-1 Sengen, Tsukuba, Ibaraki 3058505, Japan
推荐引用方式
GB/T 7714
Koyama, Christian N.,Watanabe, Manabu,Shimada, Masanobu. MONITORING OF SOIL MOISTURE DYNAMICS IN THE SEMI-ARID TROPICS BY MEANS OF ALOS-2/PALSAR-2 DUAL-POLARIZATION SCANSAR DATA[C]:IEEE,2018:5513-5516.
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