17 August 1994 Digital terrain model (DTM) integration and three-dimensional query spaces in geographic information systems
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Proceedings Volume 2357, ISPRS Commission III Symposium: Spatial Information from Digital Photogrammetry and Computer Vision; (1994) https://doi.org/10.1117/12.182830
Event: Spatial Information from Digital Photogrammetry and Computer Vision: ISPRS Commission III Symposium, 1994, Munich, Germany
Abstract
The integration of digital terrain models (DTM) in geographic information systems (GIS) implies automatically an extension of the GIS reference surface and its query space. It is trivial that a DTM is the natural boundary representation of the earth's surface. Man-made objects, for instance homes, streets, bridges, dams should be considered in a second step because these objects cannot be represented well by boundary surfaces. The link of these objects to DTM can be realized by keys and pointers. Therefore, an efficient DTM integration in GIS is the first task to be solved. The paper introduces DTM data structures represented by NIAM diagrams. Using the entity-relationship model these diagrams are very capable to describe the power of relations. Next a 3-D query space is defined keeping in mind 3-D coordinates and 2- D topological elements. Based on this query space spatial operators are derived which fit in standard SQL vocabulary. The implementation part of the paper uses the exodus storage manger to map the DTM of the Federal State Baden-Wurrtemberg in a spatial database system.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Dieter Fritsch, Dieter Fritsch, Dieter Schmidt, Dieter Schmidt, } "Digital terrain model (DTM) integration and three-dimensional query spaces in geographic information systems", Proc. SPIE 2357, ISPRS Commission III Symposium: Spatial Information from Digital Photogrammetry and Computer Vision, (17 August 1994); doi: 10.1117/12.182830; https://doi.org/10.1117/12.182830
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