DTM-BASED SURFACE AND VOLUME APPROXIMATION - GEOPHYSICAL APPLICATIONS

被引:17
作者
KALMAR, J [1 ]
PAPP, G [1 ]
SZABO, T [1 ]
机构
[1] HUNGARIAN ACAD SCI,GEODET & GEOPHYS RES INST,H-9401 SOPRON,HUNGARY
关键词
LOCAL SURFACE INTERPOLATION; DTM-BASED OPTIMIZED BODY MODEL; 3-D CRUSTAL MODEL; PANNONIAN BASIN; FORWARD GRAVITY FIELD;
D O I
10.1016/0098-3004(94)00069-7
中图分类号
TP39 [计算机的应用];
学科分类号
081203 ; 0835 ;
摘要
Based on earlier investigations, two new methods for local surface interpolation developed by us were applied to derive regular grids, that is Digital Terrain Models (DTM) from the digitized contour lines of two surfaces. These surfaces represent two main structural boundaries of the Earth's crust, the pre-Tertiary basement and the Mohorovicic discontinuity in the Pannonian Basin, Hungary. The grids were used to model the volume of sediments and mantle material above the basement and below the Moho respectively in order to build up an initial version of a 3-D model of the crust in Hungary for regional gravity field modeling. The grid representation provides an evident and elementary way for modeling a body by right rectangular prisms of Delta x x Delta y x z, where Delta x and Delta y are distances between grid knots in the X and Y directions respectively, and z represents a grid value at a grid knot. However, because of the nature of forward gravity modeling, the elementary prisms might be drawn together in a simple volume density distribution (e.g. homogeneous layer) and in such a way that the computation time can be reduced significantly. Therefore, a recursive algorithm for volume approximation by right rectangular prisms of a body determined by its DTM also was developed and applied in the determination of the 3-D crustal model in the Pannonian Basin.
引用
收藏
页码:245 / 257
页数:13
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