TM影像在陕北地区生态环境本底调查中的应用

BASE SITUATION INVESTIGATION OF ECOLOGICAL ENVIRONMENT IN NORTH SHAANXI PROVINCE WITH THE DATA OF TM IMAGES

利用1997年11幅TM影像为遥感信息源,以陕北地区(榆林、延安、铜川)为试验区,采用ERDASIMAGINE提供的计算机监督分类方法,对该地区的植被类型、植被覆盖度、土地利用以及坡耕地进行了大规模的遥感调查,并将调查成果按110万比例尺制图。研究表明,利用监督分类方法对分辨率为30m的TM影像进行陕北地区生态环境遥感调查与制图是可行的,能较真实地反映该地区植被和土地利用的基本特征。

According to the method of supervised classification in ERDAS IMAGINE, the ecological investigations, such as vegetation type, vegetation coverage, landuse and sloping cultivated land, were made for Yulin, Yanan and Tongchuan regions in north Shaanxi province, using the data of 11 TM images in 1997, and the results were mapped at a scale of 1:100000. The results show that the investigation of ecological environment with TM image using the method of supervised classification on Loess Plateau was proved available. With the assistant of knowledge of basic GIS information and other data resource, the mean precision can be achieved about 83.8%.