目前,加拿大采用一种既经济又准确的大面积监测森林衰竭状态的管理方法,即利用1:1万地形图按10Km~2为单元的UTM地图坐标方格管理林区。这些图构成管理加拿大森林资源的基础。大量凋查数据是从1:4万～1:7万航空像片上获取的。航空像片町以从国家航片库查得,省一级也有类似的航片库,存有1:1万～1:5万的航片资料,由航片产生图纸、报告、数据等。但是,绝大多数原始资料都是10～30年前的。这些现存数据提供了有价值的工作基础。目前,需要获取特定位置森林资源的显著变化数据。卫星图像,特别是彩色透明片,能以较低的成本获得最佳信息。困难在于需对数据进行解译和转绘成适宜的图件。尽管Landsat图像分辨率低,但火烧林地轮廊清晰,砍伐林地,新建林区道路也易识别,并能通过光学处理从图像细部解译出所需的信息。对监 At present, Canada adopts an economical and accurate management method for monitoring the state of forest depletion in a large area, that is, using 1: 10000 topographic maps to manage the forest area in UTM map coordinates of 10Km ~ 2 units. These maps form the basis for managing Canada’s forest resources. A large number of wilting data were obtained from 1: 40000 to 1: 70000 aerial photographs. Air Photo Town to check from the State Aviation Library, the provincial level has a similar aerodrome, there are 1: 1 million to 1: 50000 photos of the flight information produced by the aerial drawings, reports, data and so on. However, most of the original information is 10 to 30 years ago. These extant data provide a valuable working basis. Currently, significant changes in forest resources are required for specific locations. Satellite images, especially color transparencies, can get the best information at a lower cost. The difficulty lies in the need to interpret and transcribe the data into suitable maps. Despite the low resolution of Landsat images, the burned woodland vestibules are clear, deforested, and newly forested roads are easily identified and optically interpret the required information from the image detail. On the prison