Monitoring of the rice cropping system in the Mekong Delta using ENVISAT/ASAR dual polarization data

Article


Bouvet, Alexandre, Le Toan, Thuy and Lam-Dao, Nguyen. 2009. "Monitoring of the rice cropping system in the Mekong Delta using ENVISAT/ASAR dual polarization data ." IEEE Transactions on Geoscience and Remote Sensing. 47 (2), pp. 517-526. https://doi.org/10.1109/TGRS.2008.2007963
Article Title

Monitoring of the rice cropping system in the Mekong Delta using ENVISAT/ASAR dual polarization data

ERA Journal ID4638
Article CategoryArticle
AuthorsBouvet, Alexandre (Author), Le Toan, Thuy (Author) and Lam-Dao, Nguyen (Author)
Journal TitleIEEE Transactions on Geoscience and Remote Sensing
Journal Citation47 (2), pp. 517-526
Number of Pages10
Year2009
Place of PublicationPiscataway, NJ. United States
ISSN0196-2892
1558-0644
Digital Object Identifier (DOI)https://doi.org/10.1109/TGRS.2008.2007963
Web Address (URL)http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4768722
Abstract

The rice cropping system in Asia is undergoing major changes to cope with increasing demography and changing climate, making rice monitoring a critical issue. Past studies have demonstrated the use of C-band synthetic aperture radar (SAR) data to map rice areas. The methods were based on the temporal change of intensity backscattering coefficient of vertically or horizontally co-polarized data (VV or HH). In this paper, we assess the use of the HH/VV polarization ratio derived from Advanced SAR (ASAR) data from ENVIS AT data for the production of rice paddy maps. The approach is based on past knowledge on the polarization behavior of rice canopy, i.e., VV backscattering is much lower than HH during a large part of the rice season, due to the attenuation of the wave by the vertical structure of the plants. The methodology is developed for the Mekong Delta, Vietnam, where a complex cropping pattern is found (one to three crops of rice per year). The approach includes a statistical analysis of the HH/VV distributions of rice and non-rice classes at different dates. The analysis results confirm that HH/VV can be used as classifier and point out the need for relevant speckle filtering prior to classification. A classification method is developed and applied to single- and multidate data sets. The methods are tested at one district of the province of An Giang and extended to the whole province. Comparisons of the mapping results to geographic-information-system land-use data and official agricultural statistics show very good agreement. The method will be further applied to the entire Mekong Delta.

KeywordsAdvanced) Synthetic Aperture Radar (ASAR); Mekong Delta; polarization ratio; rice mapping; image classification; imaging systems; land use; photoacoustic effect
ANZSRC Field of Research 2020300206. Agricultural spatial analysis and modelling
401302. Geospatial information systems and geospatial data modelling
401304. Photogrammetry and remote sensing
Public Notes

© 2009 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

Byline AffiliationsCentre for the Study of the Biosphere from Space, France
Faculty of Engineering and Surveying
Event5th International Symposium on Retrieval of Bio- and Geophysical Parameters from SAR Data for Land Applications (BioGeoSAR 2007)
Institution of OriginUniversity of Southern Queensland
Event Details
5th International Symposium on Retrieval of Bio- and Geophysical Parameters from SAR Data for Land Applications (BioGeoSAR 2007)
Event Date
25 to end of 28 Sep 2007
Event Location
Bari, Italy
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