Three-dimensional topology-considered underground working well facility modeling method

Abstract

The invention provides a three-dimensional topology-considered underground working well facility modeling method. The method comprises the following steps of: carrying out point cloud simplification;extracting a main shaft of a point cloud of a working well; rotating an original point cloud to ensure that the original point cloud stands in a three-dimensional space along the direction of the mainshaft; constructing a triangular patch to realize simple modeling of a working well model: a) extracting a point cloud on the top surface of the working well and carrying out plane fitting, b) extracting a point cloud on the bottom surface of the working well and carrying out plane fitting, c) constructing the triangular patch according to a boundary line on the top surface, a boundary line on the bottom surface and a height between the top surface and the bottom surface so as to carry out simple modeling which fits point cloud data; and constructing working model components. The method can be adapted to multiple point cloud types and is strong in algorithm adaptability; the model fits practical point clouds is good in quality; and compared with common curved surface reconstruction algorithms, the method is high in model construction speed and strong in practicability, and is capable of realizing organic unification between internal pipelines and external point clouds and better satisfy reproduction of practical scenes.

Description

technical field [0001] The invention belongs to the technical field of space information, in particular to a modeling method for underground well facilities in consideration of three-dimensional topology. Background technique [0002] 3D laser scanning technology emerged in the reverse engineering of the industrial field in the early days, and was mainly used in the industrial manufacturing fields such as handicraft design, automobile, aircraft and shipbuilding, and was gradually applied to the surveying and mapping industry. In the development of urban underground pipelines, with the improvement of the information construction level of urban underground pipelines, the expression form of underground pipeline information has been gradually upgraded from traditional two-dimensional symbols to three-dimensional three-dimensional. The distribution of pipelines in the underground is criss-crossed, and two-dimensional graphics cannot express the spatial relationship between pipeli...

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Problems solved by technology

However, most of the underground space modeling research is currently focused on the three-dimensional modeling of underground pipelines and stratum modeling, and less consideration is given to the topological relationship between underground wells and pipelines between wells. Hu Zhen et al. Transform the two 3D simulation methods to construct the underground pipeline model, but there is a certain error between the constructed model and the actual

Tang Xiangzhen realized the three-dimensional conversion of two-dimensional models through interaction, but due to the need for two-dimensional data and interactive operations, there are certain limitations

Li Qingquan proposed a model calculation method of step-by-step calculation, but this article only introduced the generation of circular pipelines, and lacked research on the well model

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