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。
By methods of engineering drilling and geophysical investigation, this survey had ascertained the topographical feature of seabed, strata structure and physical mechanics property within survey area.
通过海洋物探方法和地质钻探施工，基本揭示了本区海底地形地貌特征、岩土层结构及土的物理力学性质。
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