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Volume :36 Issue : 136 2010      Add To Cart                                                                    Download

Geomapper: A Visual Basic Software For Construction And Rendering Of 3d Solid Geologic Models

Auther : Dr. Alaa A. Masoud

     Construction and visualization process of the three-dimensional models has been recently advanced underpinned with the rapid advances in computer technology and numerical computation algorithms. These modeling approaches have been proven to be promising in predicting geological, structural, and hydrological settings needed for environmental planning of land-use, hazard mitigation, and sustainable resource management. However, these models require densely distributed data points that are often sparse and scarce. The present work introduces prototype 3D geologic modeling tools developed to assist in constructing 3D models from traditional geologic maps stored as GIS layers taking information depicted on these maps or from drilled-well charts as a source for data. The process-oriented algorithm integrates a successive sequence of geologic events and a logical model. The logical model describes the inter-relationships between the geologic units and their defining boundaries and the 3D surface data represented by the topography. The tools implemented can produce and visualize models ranging from simple layered sedimentation/erosion to complexly faulted geologic units, based on scattered data (e.g. surfaces, 3D grids, and the geologic entity/boundary hierarchy). The tools were encoded into a Visual Basic (VB) program with Arabic and English graphical user interfaces (GUI) to enhance its interoperability and to effectively establish a geoinformation knowledge base in institutional/educational courses in areas where Arabic is the native language. The implemented functions allow estimating the continuous surface boundaries using optimal approximation techniques, importing data from other GIS packages like GRASS GIS and ARC GIS, logical model building, interactive setting of the perspective view, contouring, and outputting the results to bitmap image format. Outputs include 2D and 3D perspective geologic views, user-defined cross-sections, structure contours, and continuous dip surfaces. Mathematical formulae used for the implemented tools are described. The software was successfully tested and proved promising using simulated fault and landslide data as well as terrain data from the landscape surrounding Riyadh City in the Kingdom of Saudi Arabia.

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May 18, 2017

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