基于2004年和2008年的8 d 合成的MODIS 多时相地表反射率产品,提取华北冬麦种植典型区面积分布. 根据冬小麦生育期内时相变化建立了EVI时序曲线;基于Savitzky-Golay滤波降低云对时序数据的影响重构时序EVI数据,并结合作物物候期、种植结构和图像解译结果, 提取华北典型区冬小麦种植空间分布. 结果表明, 依据MODIS-EVI时序数据提取的研究区冬小麦种植面积空间分布, 与统计数据比较其总体精度可达98%. 2008年冬小麦的面积与2004年相比有所增加, 其中山东省增加15%左右; 而北京和天津市这5年里的面积基本持平.
The multi-temporal 8-day composite MODIS surface reflectance products of 2004 and 2008 were used to extract winter wheat planting area in the typical region of North China. The time-series EVI curve was built according to the growth period of winter wheat. We reconstruct the MODIS-EVI time-series using Savitzky-Golay smooth filter to reduce the cloud noise. By considering coupling with crop phenology, planting structure, and visual interpretation, we extract the planting area of winter wheat. The results show that the spatial distribution for winter wheat extracted by MODIS-EVI time-series data is about 98% of the statistical data. The planting area of winter wheat in Shandong province was increased by about 15%. However, the planting areas of winter wheat in Beijing and Tianjin regions are mainly invariant in the past 5 years.
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