利用MODIS 数据监测河北省冬小麦种植信息

根据冬小麦发育期的同步性、土壤类型、灌溉条件等多项因子, 参考河北省土地利用现状资料和生态功能区划成果, 将河北省冬小麦种植区域划分为五大区。利用多时相MODIS 遥感数据和冬小麦地面GPS 定位调查信息, 充分考虑冬小麦的生长发育特征和下垫面的植被生长特征来剔除小麦生长季节的非麦区信息。在测算冬小麦种植面积、解决混合像元问题时, 改进了“麦土比”的概念,提出了“像元麦土比”的新方法, 将遥感知识、农学知识和地学知识进行有机结合, 形成一套计算机自动提取冬小麦种植信息系统。利用该系统提取了河北省2004～2005 年度冬小麦播种信息, 遥感测算的全省总面积误差为3. 2% , 综合考虑各个地市的偏差情况, 9 个地市面积平均绝对误差为9. 6%。

Monitoring Planting Information of Hebei Province Winter Wheat Utilizing MODIS Data

According to the growing synchronizations of winter wheat,the growing average status,the soil types and the irrigation conditions,etc,referring to Hebei recent land-using data and ecological regionalization result,this paper devides the planting environment of winter wheat into five parts in Hebei province.On this basis,with the use of multi-temporal MODIS data and spot GPS location information,fully considering the growing characteristics of winter wheat and the surface vegetation,this paper finds out the non-winter wheat planting area's information in the growing season.When calculating the winter wheat's planting area and solving mixing pixels,this paper Improves the ratio of the wheat area and land into a new method which calculates the ratio of actual wheat planting area and those map area of wheat pixels.Combining the remote sensing knowledge,geographical knowledge and agricultural knowledge,making an system of monitoring planting information,later we use this system to extract the winter wheat planting information during 2004~2005 period and give the total area statistic error of 3.2%.