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您的检索式：作者名="Hugo LEDOUX"
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| 1 | A star-based data structure to store efficiently 3D topography in a database显示文摘For storing and modeling three-dimensional(3D)topographic objects(e.g.buildings,roads,dykes,and the terrain),tetrahedralizations have been proposed as an alternative to boundary representations.While 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 implicitly.It has been used previously in main memory,but not in a DBMS.We describe how to modify it to obtain an efficient implementation in a DBMS,and we describe how it can be used for modeling 3D topography.As 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 efficiently.The 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. | Hugo LEDOUX Martijn MEIJERS | 2013 | Geo-Spatial Information Science2013，16，4： | 0 |
| 2 | Three-dimensional modeling with national coverage:case of The Netherlands显示文摘Three-dimensional technologies have matured over the years.At the same time,3D information is becoming increasingly important in many applications.Still it is not straightforward to apply the solutions that work on prototypes,small areas or for specific projects to 3D modeling of a whole nation.In the Netherlands,two initiatives are ongoing to address the issues of nation-wide 3D modeling.First,the initiative that aims at establishing and implementing a national 3D standard for large-scale topography with support of all stakeholders.Collecting 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 data.Both initiatives are presented in this paper including results,open issues,and future plans. | Jantien STOTER Linda van den BRINK Jakob BEETZ Hugo LEDOUX Marcel REUVERS Paul JANSSEN Friso PENNING George VOSSELMAN Sander OUDE ELBERINK | 2013 | Geo-Spatial Information Science2013，16，4： | 0 |
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