基于3D Tiles的大规模三维地质模型共享技术研究  

Research on large-scale 3D geological model sharing technology based on 3D Tiles

作　　者：吴龙华 侯建光 朱月霞 李运杰 WU Longhua;HOU Jianguang;ZHU Yuexia;LI Yunjie(Jiangsu Geological Bureau,Nanjing 210007,China)

机构地区：[1]江苏省地质局地质信息中心,南京210007

出　　处：《物探化探计算技术》2024年第2期242-250,共9页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：江苏省地勘基金项目(SDK2020001);江苏省省级财政(地质找矿)专项资金项目(HDYS-DZ005)。

摘　　要：针对三维地质模型的网络共享与发布研究较少,基于3D Tiles提出了一种大规模三维地质模型共享发布方案:首先采用基于二次误差测度(QEM)的半边折叠算法,对模型进行简化,建立分层LOD模型;再利用平面四叉树+纵向固定距离切分的方法对各级模型进行分块,建立瓦片分层结构树;最后计算出所需的几何误差、变换矩阵等参数,并生成3D Tiles瓦片内容及瓦片集描述文件。基于此方案选取了某区域约1000 km^(2)的三维地质体模型进行了实验,实验表明该方案在保障模型的几何特征和细节表现的同时,可对大规模三维地质模型进行高效、流畅的加载与显示。With the lack of research on network sharing and publishing of 3D geological models,a large-scale 3D geological model sharing and publishing scheme is proposed based on 3D Tiles:First,the half-edge folding algorithm based on the quadratic error measure(QEM)is used to simplify the model and establish a hierarchical LOD model;Then use the method of quadtree with vertical fixed distance segmentation to divide models at all levels,and establish a tile hierarchical structure tree;Finally the required geometric error,transformation matrix and other parameters are calculated,and the 3D Tiles tile content and tile set description file are generated.Based on this scheme,a 3D geological body model of about 1,000 square kilometers in a certain area was selected for experiments.Experiments show that this scheme can efficiently and smoothly display large-scale 3D geological models while ensuring the geometric features and details of the model.

关 键 词：3D Tiles 共享与发布 三维地质 CESIUM 

分 类 号：P628[天文地球—地质矿产勘探]