1. National-Local Joint Engineering Laboratory of Geo-spatial Information Technology, Hunan University of Science and Technology, Xiangtan 411201, China 2. School of Resource,Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan 411201, China
It is essential to obtain a wide range of spatial distribution and dynamic change information of paddy rice timely and accurately for scientific guidance of rice production, rational utilization of water resources, and monitoring of atmospheric environmental changes. In this study, the decision tree extraction model of rice planting area in Hunan Province was constructed on the basis of time series variation characteristics of MODIS-derived LSWI and EVI in rice planting area, and the accuracy of the model was evaluated. In addition, the spatiotemporal variation characteristics of the rice planting areas in Hunan Province from 2000 to 2016 were investigated. The results are as follows: the total classification accuracy of rice planting area extraction model in the research area is 90.2%, the Kappa coefficient is 0.74 and; in comparison with agriculture statistics, the mean relative error is 13.6%. The proposed extraction model can be applied to the efficient extraction of rice planting area on a wide range and long time series basis. The average annual rice planting area in Hunan Province is 3 441.2 thousand hectares, of which 1 024.1 thousand hectares are single-cropping rice, mainly distributed in the Dongting Lake plain, and 2 417.1 thousand hectares are double-cropping rice, mainly distributed in the north-central part of Hunan Province such as Yueyang, Yiyang, Changde, Changsha, Zhuzhou, Xiangtan and Loudi City. the rice planting area in Hunan Province was reduced by 732 thousand hectares from 2000 to 2004, reached a relatively stable level in 2005—2010 and increased by 295.5 thousand hectares in 2011—2016. Overall, there existed a decreasing trend from 2000 to 2016, with the rice planting area reduced by 582.2 thousand hectares.
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Gang DENG, Zhiguang TANG, Chaokui LI, Hao CHEN, Huanhua PENG, Xiaoru WANG. Extraction and analysis of spatiotemporal variation of rice planting area in Hunan Province based on MODIS time-series data. Remote Sensing for Land & Resources, 2020, 32(2): 177-185.
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