Arc scanning type construction scheme of triangular irregular network containing edge topological information

Abstract

The invention discloses an arc scanning type construction scheme of a triangular irregular network containing edge topological information and relates to a technology for constructing the triangular irregular network (TIN) which is required for data processing of a geographical information system (GIS) and a laser radar (LiDAR), in particular to a fast construction technology of the triangular irregular network containing the edge information. In the scheme, a data structure containing directed edges and a topological relation thereof is used. The scheme comprises the following steps: firstly calculating distances and azimuth angles of all points in a point set relative to a certain selected reference center, sequencing the point set according to the distances to the reference center, joining discrete points into the triangular network one by one through the circular arc scanning way from inside to outside according to the sequence, and simultaneously performing local optimization on a newly generated triangle through the recursion way. In the method, a double circular linked list is combined with a storage bucket which is divided according to the azimuth angles for managing and retrieving all the edges on a convex border on the outer side of the existing triangular network. When each point is jointed into the triangular network, the guide function of the storage bucket is utilized for fast finding out the edges being in line with the networking conditions so as to construct the new triangle. The method has the characteristics of fast network construction speed, simple concept, easiness in realization and clear topological relation of the triangular network, thereby providing the effective method for constructing the triangular irregular network and performing the data processing thereof based on massive data of the LiDAR.

Description

technical field [0001] The invention relates to the construction technology of the irregular triangular network (TIN) required for geographic information system (GIS) and laser radar (LiDAR) data processing, especially the rapid construction technology of the irregular triangular network containing side information. Background technique [0002] Irregular triangulation is an important digital elevation model in the field of GIS. Because it is not limited by resolution, has low data redundancy, and is convenient for drawing 3D graphics, it has broad application prospects in the fields of terrain visualization and hydrological simulation models. . At present, the data structure adopted by irregular triangulation is mostly based on the structure of triangle records, and does not directly contain the topological information of the edges. This causes the topological information about edges to be obtained through certain searches and calculations, which affects the efficiency of ...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the deficiencies that the existing Delaunay triangulation data structure does not contain edge information and the existing scan line method, and proposes a scan line type construction method for the Delaunay triangulation that contains edge topology information

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