2004 Volume 15 Issue 4 Pages 193-208
The geologic function that assigns a unique geologic unit to every point in the objective 3-D space is a key element of a computer geo-mapping. Algorithms for construction and visualization of 3-D geologic model based on the geologic function have been widely developed. As the concept of geologic boundary is not contained in the geologic function, it was newly defined a generalized geologic function that assigns a pair of directly above and below geologic units to every point in the objective 3-D space. The generalized geologic function clarifies a boundary of geologic units to be visualized. Visual Basic program Geomodel2003 was developed to visualize geologic boundaries on the objective surface by embedding sub-routines for visualization of geologic boundary which had been developed in the Geomodel2000. We verified the adequacy and usefulness of the proposed algorithm. Application of Geomodel2003 to a test data in Honjyo area, Akita Prefecture, Japan, proved that the proposed algorithm is valid 3-D geologic modeling.
