Rice crop mapping using radar imagery: comparison of classification accuracy of different Envisat ASAR modes and classifiers

Lam-Dao, Nguyen and Apan, Armando and Le-Toan, Thuy and Bouvet, Alexandre and Young, Frank and Le-Van, Trung (2009) Rice crop mapping using radar imagery: comparison of classification accuracy of different Envisat ASAR modes and classifiers. In: 2009 Surveying and Spatial Sciences Institute Biennial International Conference (SSC 2009), 28 Sep-2 Oct 2009, Adelaide, Australia.

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Food security has become a key global issue due to rapid population growth in many parts of Asia, as well as the effect of climate change. For this reason, there is a need to develop spatio-temporal monitoring system that can accurately assess rice area planted. In the Mekong Delta, Vietnam, the changes in cultural practices have been gradually adopted in the last ten years. These changes have impacts on remote sensing methods developed for rice monitoring, particularly on the accuracy of the resulting classified image. Thus, the aim of this study was to compare the accuracy obtained by different Envisat ASAR modes (APP and WS) and the classifiers used. Using Envisat ASAR APP data, the study showed that the radar backscattering behaviour is much different from that of the traditional rice previously reported in the literature, due to changes brought by modern cultural practices. The polarisation ratio (HH, VV) of rice fields at a single date during a long period of the rice season could be used to derive the rice/non-rice mapping algorithm. The results of this thresholding algorithm achieved higher and consistent accuracies between seasons and districts (i.e. maximum accuracy of 99% and 98%, respectively) across the study site when compared to other classifiers, such as the minimum-distance-to-means, maximum likelihood, spectral angle mapper (SAM), ISODATA and K-Means. Regarding the ASAR modes of data acquisition, the ASAR APP data yielded higher and consistent classification accuracy. However, the ASAR WS product proved to be a potential data for rice mapping at regional scale.

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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to published version due to publisher copyright policy.
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Surveying and Land Information
Date Deposited: 25 Mar 2010 02:46
Last Modified: 20 Nov 2015 05:05
Uncontrolled Keywords: food security; spatio-temporal monitoring; rice crop mapping; rice; monitoring; rice monitoring; radar imagery; classification accuracy; Envisat ASAR modes; classifiers; Vietnam
Fields of Research : 08 Information and Computing Sciences > 0801 Artificial Intelligence and Image Processing > 080109 Pattern Recognition and Data Mining
09 Engineering > 0999 Other Engineering > 099902 Engineering Instrumentation
09 Engineering > 0909 Geomatic Engineering > 090905 Photogrammetry and Remote Sensing
Socio-Economic Objective: B Economic Development > 82 Plant Production and Plant Primary Products > 8204 Summer Grains and Oilseeds > 820402 Rice
URI: http://eprints.usq.edu.au/id/eprint/7146

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