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Multiresolution compression and visualization of global topographic data / T. Gerstner in Geoinformatica, vol 7 n° 1 (March - May 2003)  

Public [article]  inGeoinformatica > vol 7 n° 1 (March - May 2003) . - pp 7 - 32 Titre : Multiresolution compression and visualization of global topographic data Type de document : Article/Communication Auteurs : T. Gerstner, Auteur Année de publication : 2003 Article en page(s) : pp 7 - 32 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie numérique [Termes IGN] arbre-B [Termes IGN] compression de données [Termes IGN] données topographiques [Termes IGN] modèle numérique de terrain [Termes IGN] représentation multiple [Termes IGN] Triangulated Irregular Network [Termes IGN] visualisation Résumé : (Auteur) We present a multiresolution model for terrain surfaces which is able to handle large-scale global topographic. It is based on a hierarchical decomposition of the sphere by a recursive bisection triangulation in geographic coordinates. Error indicators allow the representation of the data at various levels of detail and enable data compression by local omission of data values. The resulting adaptive hierarchical triangulation is stored using a bit code of the underlying binary tree and additionally, relative pointers which allow a selective tree traversal. This way, it is possible to work directly on the compressed data. We show that significant compression rates can be obtained already for small threshold values. In a visualization application, adaptive triangulations which consist of hundreds of thousands of shaded triangles are extracted and drawn at interactive rates. Numéro de notice : A2003-059 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1023/A:1022818126783 En ligne : https://doi.org/10.1023/A:1022818126783 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22355 [article]

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