论TM图像在土地利用和农作物布局动态监测中的定位定性精度

OM THE POSITIONING AND QUALITATIVE ACCURACY OF TM IMAGES IN OBSERVATION OF DYNAMIC CHANGE OF LAND USE AND CROP DISTRIBUTION

由于经济建设的发展和自然因素的影响，土地利用状况和农作物布局每年都在发生变化，耕 地在减少、农作物布局每年在调整、建设用地不断增加，为及时掌握土地利用和农作物布局的动态 变化，根据全国农业区划委员会的要求，利用ＴＭ磁带结合彩红外航片和地图，在北京地区进行 了动态监测研究试验。由１：１０万地形图选取平面控制点对ＴＭ磁带进行精处理，平面定位精度为 半个象元，精度较高；利用微机多因子自动分类和目视解译对比分析，定性分类精度达９４％；ＴＭ 图象的多光谱信息丰富，定位定性精度较高，适用于土地利用和农作物布局的动态监测，周期短、 效益好。

Because of the influences of economical construction development and natural factors, the change of land use condition and crop distribution has been taking place every year, including the decrement of cultivated land, the adjustment of crop distribution and the increment of building-used land. In order to capture the dynamic change of land use and crop distribution Promptly, at the request of National Agricultural Zoning Committee, we made a study test for dynamic monitoring in Beijing area, using TM imagery integra- ted with the color infrared aerial photo and maps. When the precise geometric rectification of TM imagery was made with the ground control points selected from topographic map in scale of 1:100000, the accuracy of half a pixel is high. In the comparison analysis between the multi-factor auto-classification on microcomputer and visual interpretation, both qualitative accuracy can reach to 94 percent. The multispectral information of TM imagery is abundant, both its positioning and qualitative accuracy are relatively high, so it it suitable for the dynamic monitoring of land use and crop distribution, and will has shot period and high efficiency.