This study identifies the process of urban expansion and building density since 1932 using a combine of technology of RS and GIS.
基于历史地图、地形图和遥感影像提取1932年以来，北京主城区城市空间扩张，以及建筑密度空间信息。
It fully reflected that the technology is an important technical method of modern geological work gathering GIS, GPS, RS and computer technology in one.
充分体现了该项技术是集g IS、GPS、RS和计算机技术为一体的现代地质工作重要方法和技术手段。
Using the GIS and RS technology, the cultivated land database could be developed and evaluation units & data could be obtained quickly. Thus the efficiency of work could be improved.
利用GIS和RS技术可以建立耕地资源数据库，快速准确地获取评价数据和确定评价单元，提高评价工作效率；
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