获取数字三维地形成果主要涉及数据源、采集模式和生产流程个方面。
To gain the 3d digital topographic results mainly involves three aspects such as the data source, the processing mode and the production procedure.
DEM是地形表面的数字表达，易于三维可视化和统计分析。
DEM is a digital expression of landform surface, and is of great advantage to three-dimensional visualization and statistical analysis.
在小区规划，园林设计等与三维地形有关的数字分析中，地表面积是经常用到的数据。
When community programming planed, surface area is usually used to express digital analyze about three dimension terrain.
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