A 3-dimensional data model for visualizing cloverleaf junction in a city model

Chen Jun*, Sun Min, Qiming Zhou

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

2 Citations (Scopus)


The research work has been seldom done about cloverleaf junction expression in a 3-dimensional city model (3DCM). The main reason is that the cloverleaf junction is often in a complex and enormous construction. Its main body is bestraddle in air, and has aerial intersections between its parts. This complex feature made cloverleaf junction quite different from buildings and terrain, therefore, it is difficult to express this kind of spatial objects in the same way as for buildings and terrain. In this paper, authors analyze spatial characteristics of cloverleaf junction, propose an all-constraint points TIN algorithm to partition cloverleaf junction road surface, and develop a method to visualize cloverleaf junction road, surface using TIN. In order to manage cloverleaf junction data efficiently, the authors also analyzed the mechanism of 3DCM data management, extended BLOB type in relational database, and combined R-tree index to manage 3D spatial data. Based on this extension, an appropriate data structure for cloverleaf junction in 3DCM is proposed.

Original languageEnglish
Pages (from-to)9-15
Number of pages7
JournalGeo-Spatial Information Science
Issue number1
Publication statusPublished - Dec 1999

Scopus Subject Areas

  • Geography, Planning and Development
  • Computers in Earth Sciences

User-Defined Keywords

  • 3-dimensional city model (3DCM)
  • Cloverleaf junction
  • Data structure
  • Database
  • GIS


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