Visualization is the key to understanding the topographical data and provides a special way of revealing the relationship and laws between submarine landform and other Marine factors.
可视化是地形数据解译的关键，它为揭示海底地形与其他海洋要素之间所蕴含的关系和规律提供了独到的方法。
Digital Terrain Model is a general designation of space topographical data set, and it is the digital description with the figure of space position and topographical attributive character.
数字地形模型是空间地形数据集合的统称，是具有空间位置特征和地形属性特征的数字描述。
But most of topographical map database produced by survey department is only cartographic data, which is vector data structure, but cannot be imported into GIS directly to meet GIS using.
但测绘部门建立的地形图数据库多为单纯的制图数据，虽然与GIS数据一样是矢量结构，却无法直接输入GIS以满足应用需要。
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