利用DLG进行DEM的高程提取

Elevation extraction of establishing DEM with DLG

大比例尺数字线划地形图(DLG)是目前我国建立数字高程模型(DEM)的一个主要数据来源,通过分析DEM的建立过程得出由DLG建立DEM的关键问题是从DLG中高效获取有效的高程数据。对提取高程数据工作中可能出现的数据格式多样性、数据提取效率和有效数据丢失等情况提出了相应的解决办法。

Large scale digital line global map is a main data source of establishing DEM in our country at present.It can be concluded that the key point in the process of establishing DEM is to acquire elevation data efficiently from it.The correspounding way of dealing with various situations were proposed such as data format variety,extracting elevation data efficiently and effective data loss in the work of extracting elevation data.