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A star-based data structure to store efficiently 3D topography in a database

Geo-Spatial Information Science 2013年第4期16卷 256-266页

作者： hugo ledoux Martijn MEIJERS Faculty of Architecture and the Built Environment OTBGIS technologyDelft University of TechnologyJaffalaan 92628 BXDelftThe Netherlands

For storing and modeling three-dimensional(3D)topographic objects(***,roads,dykes,and the terrain),tetrahedralizations have been proposed as an alternative to boundary *** in theory they have several advantages,current implementations are either not space efficient or do not store topological relationships(which makes spatial analysis and updating slow,or require the use of an expensive 3D spatial index).We discuss in this paper an alternative data structure for storing tetrahedralizations in a database management system(DBMS).It is based on the idea of storing only the vertices and stars of edges;triangles and tetrahedra are represented *** has been used previously in main memory,but not in a *** describe how to modify it to obtain an efficient implementation in a DBMS,and we describe how it can be used for modeling 3D *** we demonstrate with different real-world examples,the structure is compacter than known alternatives,it permits us to store attributes for any primitives,and has the added benefit of being topological,which permits us to query it *** structure can be easily implemented in most DBMS(we describe our implementation in PostgreSQL),and we present some of the engineering choices we made for the implementation.

关键词： 3D GIS tetrahedralization database management system(DBMS) data structures

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Three-dimensional modeling with national coverage:case of The Netherlands

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Geo-Spatial Information Science 2013年第4期16卷 267-276页

作者： Jantien STOTER Linda van den BRINK Jakob BEETZ hugo ledoux Marcel REUVERS Paul JANSSEN Friso PENNING George VOSSELMAN Sander OUDE ELBERINK Kadaster Hofstraat 1107311ApeldoornThe Netherlands OTB-Section GIS Technology)Delft University of Technology Jaffalaan 92600 AADelftKZThe Netherlands Geonovum Barchman Wuytierslaan 103818 LH AmersfoortThe Netherlands Department of the Built Environment Eindhoven University of TechnologyVRT 9.08Postbus 5135600 MBEindhovenThe Netherlands Department GeoInformation City of The HagueThe Netherlands Faculty of Geo-Information Science and Earth Observation–ITC University of TwenteHengelosestraat 997514 AEEnschedeThe Netherlands

Three-dimensional technologies have matured over the *** the same time,3D information is becoming increasingly important in many *** it is not straightforward to apply the solutions that work on prototypes,small areas or for specific projects to 3D modeling of a whole *** the Netherlands,two initiatives are ongoing to address the issues of nation-wide 3D ***,the initiative that aims at establishing and implementing a national 3D standard for large-scale topography with support of all *** and maintaining the large-scale data are the responsibility of local governments(mainly municipalities).The second initiative is led by the Kadaster(the organization responsible for topographic mapping in the Netherlands)and aims at automatically generating a 3D version of the 1:10 k object-oriented data-set based on a smart combination of the two-dimensional data with high-resolution laser *** initiatives are presented in this paper including results,open issues,and future plans.

关键词： 3D modeling 3D standard country wide 3D mapping

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