Geographic entity surface element extraction of intersections based on road vector data
Geographic entity data is an important part of three-dimensional(3D)real scene data,and intersection entity plays an important role in urban 3D real scenes.At present,the extraction of the entity surface element of the intersection is to manually locate the intersection and manually construct the intersection surface at the intersection position,but it is easy to miss the intersection,and there is a lot of manual editing work.In order to accurately locate the intersection and efficiently construct the intersection surface elements,this paper designed a method of extracting geographic entity surface elements of intersections based on road vector data.By constructing a triangulated irregular network(TIN)of road data and analyzing the characteristics of TIN at the intersection,the paper accurately located the intersection and automatically constructed the surface element of the intersection.The paper also verified the effectiveness of the proposed method based on the fundamental surveying&mapping road vector data in Hunan Province.The experimental results show that the accuracy of intersection located by this method reaches 97.5%,and the construction of the intersection surface is more accurate,which can effectively shorten the production cycle of the intersection entity,and the research results can be applied to the localization and construction of other strip intersection entity classes.
geographic entitytriangulated irregular network(TIN)road vector datasurface element
万方数据
维普
