| 基于轮廓线三维矿体表面重建的一种改进算法 |
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| 引用本文： | 李兆亮,王林飞,熊盛青,罗锋,闫浩飞,朱自强.基于轮廓线三维矿体表面重建的一种改进算法[J].物探与化探,2019(1):118-124. |
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| 作者姓名： | 李兆亮 王林飞 熊盛青 罗锋 闫浩飞 朱自强 |
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| 作者单位： | 中国自然资源航空物探遥感中心;自然资源部航空地球物理与遥感地质重点实验室 |
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| 基金项目： | 国家重点研发计划项目"综合航空地球物理数据处理;解释和管理软件平台研发"(2017YFC0602204) |
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| 摘 要： | 基于轮廓线的三维矿体表面建模方法是矿体建模的主流方法,但在实际应用中,传统的建模方法显现出了不足之处,笔者对该方法进行了针对性地改进。对于一组单轮廓线可自动添加矿体趋势线,并且还可以进行人工编辑修改,然后利用中间加密轮廓线的方法实现对矿体形态的控制。通过投影计算封闭轮廓线之间的最短距离自动添加分支点,利用平面的带洞限定三角剖分实现分支的自动构建,大大节省了人力资源,同时保证了分支矿体的准确性。针对初始构建的三维矿体表面模型几何质量差,引入了质量控制,实现了表面模型的重构,保证了模型质量和后续的计算。这些改进在实际的应用中取得了良好的效果。
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| 关 键 词： | 矿体表面建模 矿体趋势 分支矿体 网格优化 |
An improved algorithm for surface reconstruction of 3D orebody based on contour line |
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| LI Zhao-Liang,WANG Lin-Fei,XIONG Sheng-Qing,LUO Feng,YAN Hao-Fei,ZHU Zi-Qiang.An improved algorithm for surface reconstruction of 3D orebody based on contour line[J].Geophysical and Geochemical Exploration,2019(1):118-124. |
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| Authors: | LI Zhao-Liang WANG Lin-Fei XIONG Sheng-Qing LUO Feng YAN Hao-Fei ZHU Zi-Qiang |
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| Institution: | (China Aero Geophysivey & Remote Sensing Center for Natural & Resource, Beijing 100083, China;Key laboratoray of Airborn Geophysics and Remote Sensing Geology, Ministry of Natural and Resource, Beijing 100083, China) |
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| Abstract: | The 3 D orebody surface modeling method based on contours is the main method of orebody modeling;nevertheless,in practical application,the traditional modeling method has shortcomings,which have been improved with the method in this paper. In general,contour lines of these methods are used to reconstruct the surface model by artificial selection of two contour lines,but it is difficult to grasp the overall trend of the orebody as a whole,and the shape of the three dimensional orebodies is relatively coarse. When researchers deal with the problem of branch,it is very tedious to add the branch point in that it takes a lot of manpower and time,and it is difficult to guarantee the correct result. The surface model of the orebody exhibits a lot of degenerated triangles,even in the situation that the surfaces of the orebodies are self-intersected or overlapped,hence the geometric quality of the model is so poor that it influences subsequent visualization and model calculation. The trend line for a group of contours is introduced,and it can also be edited.Then the encryption method for refining the intermediate contours so as to achieve the control of the orebody shape is used. Through projection,the shortest distance between closed contours is calculated,and branch points are automatically added. The constrained triangulation with holes is used to achieve the building of branch automatically,which greatly saves human resources and ensures the accuracy of branch of orebody. According to the problem of poor geometric quality of the initial 3 D orebody surface model,the quality control to achieve the reconstruction of the surface model is introduced,which ensures the model quality and subsequent calculation. These improvements have achieved good results in practical application. |
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| Keywords: | orebody surface modeling trend of orebody branch orebody mesh optimization |
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