Journal of Geo-information Science >
Extraction of Paddy Rice Coverage Based on the HJ Satellite Data
Received date: 2012-02-15
Revised date: 2012-05-03
Online published: 2012-06-25
Supported by
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HJ-1A/1B satellite has high spatial and temporal resolution, so it is a potential data source for extraction of the planting area of rice and other crops. This paper we took Jianli County and its adjacent area, located on the hinterland of Jianghan Plain, as the study area. According to the growth period duration of rice, we selected multi-temporal HJ-1A/1B images in critical period of rice growth including transplanting stage and heading and seeding stage. Because land surface water index (LSWI) is sensitive to the increased surface moisture, so we use LSWI to distinguish cotton plants and construction land in paddy rices transplanting period. There are large differences between normalized difference vegetation index (NDVI) of water and plant, then we choose NDVI in paddy rices heading and seeding stage to distinguish moisture content. The time variation of NDVI of forest with paddy rice and lotus root is different, and paddy rices shortwave infrared reflectance (RIRS-B2) is smaller than lotus roots, so we use difference normalized vegetation index (DNDVI) and RIRS-B2 to differentiate paddy rice from forest and lotus root. We obtained a method to extract the planting area of rice based on the HJ satellite data. Then taking SPOT images as reference, the area accuracy and sample point accuracy are not less than 90%, and Kappa is not less than 0.80. So this proposed method can extract the rice planting area exactly.
Key words： planting area; HJ satellite; remote sensing; paddy rice
WEI Xincai, WANG Xinsheng, LIU Hai, XU Jing . Extraction of Paddy Rice Coverage Based on the HJ Satellite Data[J]. Journal of Geo-information Science, 2012 , 14(3) : 382 -388 . DOI: 10.3724/SP.J.1047.2012.00382
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