基于BIM建模技术的三维地形生成与显示方法  

The 3D terrain generation and display based on BIM modeling technology

作　　者：黄斌 杨伟 HUANG Bin;YANG Wei(Hangzhou Huandi Survey Planning and Design Co.,Ltd.,Jiaxing,Zhejiang,314051,China)

机构地区：[1]杭州环地勘测规划设计有限公司嘉兴分公司,浙江嘉兴314051

出　　处：《测绘技术装备》2022年第2期99-104,共6页Geomatics Technology and Equipment

摘　　要：利用传统方法检索三维地形特征点时,由于其图像尺度空间的局部极值未达到最大,影响采集序列图像的匹配,进而导致生成的地形模型精度较差。基于此,本文提出基于BIM建模技术的三维地形生成与显示方法。该方法首先通过无人机机载像机连续拍摄地面,得到序列图像,并将其转换为具有三维坐标的数字图像,提取并匹配地形特征点,拼接图像得到整体地形的三维结构;其次利用BIM建模技术,集成地形三维空间数据,得到三维地形模型;最后通过空间点内插和纹理映射,渲染模型。选取某工程建设区域进行对比试验,结果表明,该方法能有效去除冗余空间点,在降低建模复杂程度的同时有效提高特征点插值精度。When using traditional methods to retrieve 3D terrain feature points,the local extreme value of the image scale space does not reach the maximum,which affects the matching of acquired sequence images,resulting in poor accuracy of the generated terrain model.For this reason,this paper proposes a 3D terrain generation and display method based on BIM modeling technology.It firstly uses the camera mounted on the UAV to continuously obtain sequence images of ground,which are converted into digital images with 3D coordinates,extracts and matches the terrain feature points,and stitches the images to get the 3D structure of the overall terrain;Then,it uses the BIM modeling technology to integrate the 3D spatial data of the terrain to obtain a 3D terrain model.Finally,the model is rendered through the method of spatial point interpolation and texture mapping and select a construction area of a project to carry out a comparative experiment.The result shows that this method can effectively remove redundant space points,reduce the complexity of modeling and improve the accuracy of feature point interpolation,and the accuracy of the 3D terrain model data constructed by this method is higher than those from traditional methods.

关 键 词：BIM建模 数字图像 三维地形 特征点 模型精度 

分 类 号：P208[天文地球—地图制图学与地理信息工程]