The establishment of a space data base of geological maps by GIS is one of important components of" digital land".
运用地理信息系统（ GIS）建立地质图空间数据库是“数字国土”的重要组成部分。
Three-dimension Seismic Data Volume is a three-dimensional digital image which maps the geological structure subsurface.
三维地震数据体是反映地下地质构造的三维数字图象。
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