| It is important in the research of the application and 3D GIS.to describe , analyse and visualize the 3D spatial entities ,it is necessary to construct 3D data structure and realize 3d entities(such as mine body, laneway, faultage, well etc..) drescribing,phenomena simulation , spatial analyse and 3D visualization in the deep application of 3DGIS on mine. The researches how to express the structure of hydrogeologic stratum, the existent condition of groundwater, the level of groundwater and the quality of groundwater and how to disclose moving regulation and dynamic characteristic of groundwater stream, form and development of groundwater cone of depression and land subsidence are in favor of the reasonable management of the groundwater resource. All these researches base on 3d geologic volume describing and the emphases are 3D model of geologic volume, 3D data structure and 3D visualization of geologic volume.The datum of geologic survey and observation is sometimes discrete and asymmetry, by which many phenomena are interpreted. The complicated geologic phenomena such as faultage, drape etc. are accurately represented and described through 3D simulation and visualization. The simple and available 3D mathematics model of geologic volume and the efficient 3D data structure are built. These are emphases in the research on 3D geologic volume. To solve this problem ,the author does a lot of research work. The basic thinking is to built 3D model, which are mingled by multiplayer DEM and tetrahedron , to disclose the rule of geologic volume distributing in the space and time. During the course of research, the author finishes the work as follows primarily.1.In the Chapter One, the paper tells four development phase of GIS , the condition and the purport on the research theme which are evaluated through the research on mine , crude petroleum layer and ground water ,then decides the primary research subject and the research context and the organization of the paper.2.In the Chapter Two, the paper reviews and sums up the present situation of3D model, data structure and 3D visualization of geologic volume at home and aboard systematically. It contrasts and analyses each form of geologic volume and many types of 3D model and data structure of the geologic volume.3.In the Chapter Three, the author develops the software system "the 3D visualization of geologic volume" by using VC++6.0 and the visualization toolkit named OpenGL.4.In the Chapter Four, the paper reviews and sums up systematically all sorts of 3D modle and data structure of geologic volume. It emphasizes on expounding the 3D model mingling multilayers DEM and tetrahedron model and its data structure, then it represents the algorithm to generate 3D model datum.5.In the Chapter Five, the paper brings forward three basic provisions of the method of interpolation in the Geo-field. It analyses and evaluated a lot of the methods of interpolation. The paper expounds the method of blending surface, the Kring method and the improved inverse distance to a power method. Then the 3D datum are generated by these methods.6.In the Chapter Six, the paper evaluates regular grids and TIN, which also brings forward Lod of regular grids and the algorithm of regular grids base on quadric tree whose features include view-dependent, real-time and multi-level. Then with regard to the generating rules and data structure of TIN , it expounds the algorithm to dynamically Simple the Triangulated Irregular Network based on viewpoint and viewaxis and the flow graphy.7.In the Chapter Seven, the paper represents 3D interacting model to edit geologic volume datum, the algorithm and formula of rotate and translate. It expounds how to convert 2D coordinates of mouse to 3D coordinates through assistant surface. Then, it represents the methods how to calculate upright slices, level slices, isoline of depth and bulk of geo_layer.8.In the Chapter Eight, Sum up the research work in the paper completely and point out the further research direction and problems. |
PDF Full Text Request