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在我国社会主义经济建设中,许多部门常常需要测定和计算土地面积。例如林业资源调查需要计算森林植被覆盖率和树种分布范围;土地管理需要调查地籍面积以控制建设用地规模和保护耕地资源;城市规划需要掌握规划区域占地情况以进行方案可行性研究等等。以前这些面积量测常常是使用器械在图面上进行的,这是有效可行的。但是在我国森林和耕地面积日益锐减的情况下,为了保护森林资源和耕地资源,进行面积的动态监测,有时需要适时进行精确的面积比较,在新图未出来之前就计算面积,因此,
In the socialist economic construction in our country, many departments often need to measure and calculate the land area. For example, the forestry resources survey needs to calculate the coverage of forest vegetation and the distribution range of tree species; the land management needs to investigate the cadastral area to control the scale of construction land and protect the resources of arable land; and the urban planning needs to know the land occupation in the planned area for the feasibility study of the program and so on. These area measurements are often performed on the surface using instruments, which is effective. However, under the circumstance of decreasing forest and arable land area in our country, in order to monitor the area of forest resources and cultivated land resources dynamically, it is sometimes necessary to compare the area accurately in time and calculate the area before the new map is come out. Therefore,