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Mapping Paddy Rice Varieties Using Multi-temporal RADARSAT SAR Images

  • Jang, Min-Won (Department of Agricultural Engineering, Institute of Agriculture & Life Science, Gyeongsang National University) ;
  • Kim, Yi-Hyun (National Academy of Agricultural Science, Rural Development Administration) ;
  • Park, No-Wook (Department of Geoinformatic Engineering, Inha University) ;
  • Hong, Suk-Young (National Academy of Agricultural Science, Rural Development Administration)
  • Received : 2012.11.17
  • Accepted : 2012.12.12
  • Published : 2012.12.31

Abstract

This study classified paddy fields according to rice varieties and monitored temporal changes in rice growth using SAR backscatter coefficients (${\sigma}^{\circ}$). A growing period time-series of backscatter coefficients was set up for nine fine-beam mode RADARSAT-1 SAR images from April to October 2005. The images were compared with field-measured rice growth parameters such as leaf area index (LAI), plant height, fresh and dry biomass, and water content in grain and plants for 45 parcels in Dangjin-gun, Chungnam Province, South Korea. The average backscatter coefficients for early-maturing rice varieties (13 parcels) ranged from -18.17 dB to -6.06 dB and were lower than those for medium-late maturing rice varieties during most of the growing season. Both crops showed the highest backscatter coefficient values at the heading stage (late July) for early-maturing rice, and the difference was greatest before harvest for early-maturing rice. The temporal difference in backscatter coefficients between rice varieties may play a key role in identifying early-maturing rice fields. On the other hand, comparisons with field-measured parameters of rice growth showed that backscatter coefficients decreased or remained on a plateau after the heading stage, even though the growth of the rice canopy had advanced.

Keywords

References

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