基于BIM的三维地形自动修正和拟合方法

在铁路工程BIM设计中,利用测绘资料生成的三维地形面是BIM设计的基准数据。现有铁路BIM设计软件一般利用已知特征点、线直接生成三角网,由该方法生成的面存在无法反映实际特征以及三角面之间过渡突兀等问题。针对此方法的不足,提出一种基于高斯过程回归模型的三维地形面拟合及修正方法,即利用少量特征点、线拟合三维地形面,也可以在顾及原始曲面三维特征的前提下,利用少量高精度特征点、线进行纠正,得到更高精度的地形面。该方法已应用于京张高铁BIM设计中,为路基、桥梁、隧道、建筑以及站后各专业提供了准确的地形基准,具备良好的实际应用价值。

A Method of automatic rectify and fit Three-Terrian in applying BIM in railway-design

In the railway BIM design,the 3 D terrain surfaces generated by surveying data is the benchmark data of BIM design.Existing railway BIM design software usually generate triangulation directly by known feature points an lines(such as delaunay).The surface generated by this method cannot reflect the actual characteristics,and there is a problem of transitional abrupt transition between triangle faces.Aiming at these shortcomings,this paper proposes a 3 D terrain surface fitting and correction method based on Gaussian process regression model.This method can be used to fit 3 D terrain surface with few feature points and lines,and which can obtain a more accurate surface by using high-precision feature points and lines to correct the original surface.The method proposed in this paper has been applied to the BIM design of BeijingZhangjiakou High-speed Railway to provide accurate topographical benchmarks for subgrades,bridges,tunnels,buildings and post-station professionals,and has good practical application value.