多层DEM建模及其在地层可视化中的应用研究

提出了一种以可视化语言IDL作为建模工具实现多层地层三维可视化的方法。该方法基本思路:(1)获取地层状况数据,对该数据进行插值分析,以规则或不规则栅格网表示地层面,形成单层DEM。(2)按照单层DEM形成方法对每个地层面进行插值或拟合,得到不同地层的三维空间分布情况。如果地层中没有断层,将各个相邻层面上的栅格网一一连接,建立拓扑关系,即可获得地层实体模型。如果地层相交,需对交叉区域进行采样点检测或高程判断,确定交叉区域所属范围,在此基础上再建立三维地层模型。(3)构造体数据,利用多层DEM对体数据分层赋值,并用不同属性标记各地层,这样就实现了地质空间的显示。测试结果表明,该方法具有一定的实用性。

Research of Multi-layer DEM Modeling and Its Application in Stratum Visualization

The paper proposed a method of using visual language IDL as modeling tool to realize 3D visualization of stratum.Basic idea of the method is as following: (1) Obtaining statue data of stratum,making interpolation analysis of the data,and expressing surface of stratum by regular or irregular grid networks to form single-layer DEM.(2) Interpolating or fitting each surface of stratum according to forming method of single-layer DEM so as to obtain distribution of 3D space of different stratum.If there is no fault in stratum,connecting the grid networks of adjacent surfaces of stratum to build topological relation,which can obtain solid model of stratum.If there is intersection in stratums,doing detection of sample points or height judgment for cross region to determine range of the cross region to build 3D model of stratum.(3) Constructing volume data,using multi-layer DEM to make hierarchical assignment,and using different properties to mark stratums,which can realize visualization of geological space.The test result showed that the method has certain practicality.