Effects of changing rice cultural practices on C-band synthetic aperture radar backscatter using Envisat advanced synthetic aperture radar data in the Mekong River Delta
Article
Article Title | Effects of changing rice cultural practices on C-band synthetic aperture radar backscatter using Envisat advanced synthetic aperture radar data in the Mekong River Delta |
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ERA Journal ID | 39708 |
Article Category | Article |
Authors | Lam-Dao, Nguyen (Author), Le-Toan, Thuy (Author), Apan, Armando (Author), Bouvet, Alexandre (Author), Young, Frank R. (Author) and Le-Van, Trung (Author) |
Journal Title | Journal of Applied Remote Sensing |
Journal Citation | 3 (1), pp. 1-17 |
Number of Pages | 17 |
Year | 2009 |
Place of Publication | United States |
ISSN | 1931-3195 |
Digital Object Identifier (DOI) | https://doi.org/10.1117/1.3271046 |
Web Address (URL) | https://www.spiedigitallibrary.org/journals/journal-of-applied-remote-sensing/volume-3/issue-1/033563/Effects-of-changing-rice-cultural-practices-on-C-band-synthetic/10.1117/1.3271046.short |
Abstract | Changes in rice cultivation systems have been observed in the Mekong River Delta, Vietnam. Among the changes in cultural practices, the change from transplanting to direct sowing, the use of water-saving technology, and the use of high production method could have impacts on radar remote sensing methods previously developed for rice monitoring. Using Envisat (Environmental Satellite) ASAR (Advanced Synthetic Aperture Radar) data over the province of An Giang, this study showed that the radar backscattering behaviour is much different from that of the reported traditional rice. At the early stage of the season, direct sowing on fields with rough and wet soil surface provides very high backscatter values for HH (Horizontal transmit – Horizontal receive polarisation) and VV (Vertical transmit – Vertical receive polarisation) data, as a contrast compared to the very low backscatter of fields covered with water before emergence. The temporal increase of the backscatter is therefore not observed clearly over direct sowing fields. Hence, the use of the intensity temporal change as a rice classifier proposed previously may not apply. Due to the drainage that occurs during the season, HH, VV and HH/VV are not strongly related to biomass, in contrast with past results. However, HH/VV ratio could be used to derive the rice/non-rice classification algorithm for all conditions of rice fields in the test province. The mapping results using the HH/VV polarization ratio at a single date in the middle period of the rice season were assessed using statistical data at different districts in the province, where very high accuracy was found. The method can be applied to other regions, provided that the synthetic aperture radar data are acquired during the peak period of the rice season, and that few training fields provide adjusted threshold values used in the method. |
Keywords | rice crop; cultural practices; synthetic aperture radar data; processing; polarisation; mapping; water conservation |
ANZSRC Field of Research 2020 | 300210. Sustainable agricultural development |
300206. Agricultural spatial analysis and modelling | |
401304. Photogrammetry and remote sensing | |
Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
Byline Affiliations | Department of Surveying and Land Information |
Centre for the Study of the Biosphere from Space, France | |
GIS and Remote Sensing Research Centre, Vietnam |
https://research.usq.edu.au/item/9z937/effects-of-changing-rice-cultural-practices-on-c-band-synthetic-aperture-radar-backscatter-using-envisat-advanced-synthetic-aperture-radar-data-in-the-mekong-river-delta
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