以河南开封和山西太谷地区作为研究区域 ,选用LandsatTM作为农作物种植面积遥感监测的数据源。利用LandsatTM提取河南开封实验区 2 0 0 1年的夏季作物和山西太谷地区 2 0 0 3年秋季作物的作物种植成数。同时 ,利用IKONOS ,QuickBird高分辨率遥感影像 ,通过地面调查进行了地面作物填图和分类 ,同样得到实验区的农作物种植成数。最后通过两种结果对比 ,表明开封实验区夏季作物的监测精度达到 99%以上 ,太谷实验区秋季作物的监测精度达到 97%以上 ,由此推断 ,表明利用LandsatTM监测农作物种植成数的精度能够满足中国农情遥感监测的运行化要求

In this paper,the accuracy of planted area proportion using Landsat TM is assessed with two pilot sites at Kaifeng of Henan province and Taigu of Shanxi province. In Kaifeng,one Landsat TM imagery on April 1 2001 was acquired for summer crop.In Taigu,Landasat TMimage on Oct.14 2001 was acquired for autumn crop.Landsat TM images were processed for ectracting the planted area proportion with 6 steps;atmospheric correction,geometric correction,SAVI calculation,non-arable land masking,unsupervised classification,and labeling.Planted pixels were counted counted and the planted area proportion can be calculated by the diveded the number of arable land pixels extracted from the land use map at a scale of 1:100 000. At the same time,in order o assess the accuracy of planted area proportion from Landsat TM,an IKONOS imagery (11km*11km Coverage)on Mar.21,2001.was acquired for Kaifeng.After an unsupervised classification based on ground survey,the planted area proportion are obtained.A QuickBird imagery was applied to Taigu site,and the planted area proportion are obtained by field works,which fills every parcel with crop or landuse type. These two planted area proportions for two sites can be compared to assess the accuracy of extracting the planted area proportion with TM data.It shows that the accuracy is 99% in Kaifeng and 97% in Taigu.And this is acceptable for the operational purpose of China Crop Watch System with remote sensing.