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目前,地理信息系统处理空间数据多停留在点、线、面三类二维的地表数据,对离散或连续的真三维数据进行处理尚处于初步研究阶段。本文基于ArcGIS9.2版本中新开发的Extrude Between模块的拉伸封闭多边形面功能,以某校区地下87个离散钻孔数据为例,进行三维虚拟实现:首先,进行空间数据的挖掘,即对87个钻孔数据通过预处理,进行对具有特异值的各个钻孔数据层空间内插,生成具有深度属性的各层等高线,最终生成模拟各地层上表面形态的TIN;然后,虚拟实现真三维数据的可视化及体视化,达到对地下实体空间进行逼真模拟,反映该校区地形、地貌、地层分布以及水文地质特征。
At present, the three dimensional two-dimensional surface data that the geographic information system deals with the spatial data stay in the point, line, surface, discrete or continuous true three-dimensional data processing is still in the preliminary research stage. Based on the function of stretch closed polygons of the newly developed Extrude Between module in ArcGIS 9.2, a three-dimensional virtual implementation is carried out using 87 discrete borehole data in a campus as an example. Firstly, spatial data mining is performed on 87 Through the preprocessing, the borehole data of each borehole is spatially interpolated to generate the contour lines of each layer with the depth attribute, and finally the TIN that simulates the topography of each layer is generated. Then, the virtual reality Three-dimensional data visualization and visualization, to achieve realistic simulation of underground physical space, reflecting the school topography, geomorphology, stratigraphic distribution and hydrogeological features.