A non-planar data model for road networks based on GIS-T
Previous data models of road networks include planar and non-planar models.In planar models,intersections of road networks are transformed into arcs,sections into nodes,and sequential pairs are used to represent arcs between nodes,which can simulate traffic direction of sections and turning limitation at intersections well,but fail to define the granularity of lane and the node height difference.Non-planar data models provide the data of node height difference,which avoid impossible turning in three-dimensional road networks,but shortages as lack of detailed information of road intersections and node height difference and the curtly defined granularity of lanes lead to the low efficiency of analysis of road networks.This paper proposes an NA+ model of road networks based on non-planar structure and combined node height difference with direction lane to describe non-planar structure of road networks.Node height difference is denoted as Arabic numerals,the granularity of lane is specified as direction lane.In GIS-T database,the intersection table and the direction lane table are used to describe node height difference and direction respectively.The model consists with the circumstance of road networks;it is proved to be applicable and feasible to the applications of GIS-T.
geographical information system for transportation (GIS-T) road networks non-planar data model node height difference direction lane
Xiao Kehui Chen Jianhong Xiao Deqin Ye Shengtao
College of Informatics,South China Agricultural University,Guangzhou,China 510642 Center of Experimental Teaching for Common Basic Courses,South China Agricultural University,Guangzh Geography and Planning School,Zhongshan University,Guangzhou,China 510275
国际会议
第16届国际地理信息科学与技术大会(16th International Conference on GeoInformatics and the Joint Conference)
广州
英文
2008-06-28（万方平台首次上网日期，不代表论文的发表时间）