| Based on the full research of method model of Mineral Resources Assessment, this paper summarizes the kernel algorithms during developing and programming software of Mineral Resources Assessment on basis of Geographical Information System (GIS). Based on the research of the kernel technologies and kits of MAPGIS, the author and his colleagues developed and programmed Mineral Resources Assessment System (MARS). It has been applied in National Mineral Resources Assessment Project.In the whole procedure of Mineral Resources Assessment, there are two important problems of multi-feature information extraction and results presentation. Exactly, GIS has an advantage on these issues. Specifically, Spatial Analysis and Spatial Index of GIS can deal with Multi-feature information extraction and Integration; auto-creating contour map provides result visualization expression. In addition, with the maturity of three-dimension (3D) visualization technology, the paper presents a method that it has applied 3D visualization technology to improve MRAS'effects of visualization.Based on the theory of Regional Mineral Resource Assessment and analysis requirements of MRAS, the paper carries out researches in the following areas:⑴.Based on research of technologies of Spatial Index and Spatial Analysis in GIS, the paper improves Point-In-Polygon query algorithm on basis of BSP tree.⑵.Based on technologies of automatic drawing map in GIS, the paper emphasizes an algorithm for contour tracing in irregular and complicated areas.⑶.Present an improved MRAS software processing. The processing applies Hillshade technology to improve visualization effect of software.⑷.Apply improved MRAS software to carry out qualitative prediction of copper and nickel deposits in East Tianshan area, Xinjiang Autonomous Region.
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