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Auteur G. Aumann |
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Titre : Aufbau qualitativ hochwertiger Geländemodelle aus Höhenlinien Titre original : [Création d'un modèle numérique de terrain de grande qualité à partir de courbes de niveau] Type de document : Thèse/HDR Auteurs : G. Aumann, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1994 Collection : DGK - C Sous-collection : Dissertationen num. 411 Importance : 97 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9456-7 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique
[Termes IGN] discrétisation
[Termes IGN] extraction automatique
[Termes IGN] extraction de traits caractéristiques
[Termes IGN] interpolation
[Termes IGN] méthode des éléments finis
[Termes IGN] squelettisation
[Termes IGN] Triangulated Irregular NetworkIndex. décimale : 33.30 Photogrammétrie numérique Résumé : (Auteur) The present interest on countrywide high quality digital terrain models (DTM) was the reason for this thesis where possible strategies for the generation of high quality digital terrain models from contours are shown. The paper deals of two main subjects, the preparation of original data and the following generation of DTM.
The basic requirement for the generation of a high quality DTM is the preparation of good original data. Digitized contours only contain the geometrical information about the terrain, which is only one pan of the information received from contours. The geomorphological information, which is very important for the generation of a DTM is only given implicitly by digitized contours. In this paper a method was evaluated and tested, which utilizes the implicit geomorphological information of contours automatically. In practical examples it was demonstrated that this new procedure utilizes automatically the geomorphological information of contours, which is necessary for the generation of a high quality DTM. The skeleton lines automatically found by this procedure agree very well to those evaluated graphically.
The investigations on DTM generation from contours confirm the statement that it is very important for the DTM generation to include geomorphological information, too. Since digital terrain models structured by gridded networks have a fundamentally more simple data organization than digital terrain models structured by triangulated networks, they are prefered for the DTM generation for big areas. A triangulation of the original data cannot be avoided. The triangulation is needed to detect the skeleton lines and for the generation of the DTM. But this triangulation can be done stepwise in smaller parts. The generation of a filtered grid structured DTM by the method of finite elements is preferable for generating high quality digital terrain models for large areas. By this method for the DTM generation contours and skeleton lines are used as well as artificial reference points in areas without reference data.Numéro de notice : 28073 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=63420 Exemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 28073-01 33.30 Livre Centre de documentation Photogrammétrie - Lasergrammétrie Disponible 28073-02 33.30 Livre Centre de documentation Photogrammétrie - Lasergrammétrie Disponible