Centre de documentation
scientifique

Use of contour-based DEM for deriving and mapping topographic attributes / H. Mizukoshi in Photogrammetric Engineering & Remote Sensing, PERS, vol 68 n° 1 (January 2002)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 68 n° 1 (January 2002) . - pp 83 - 93 Titre : Use of contour-based DEM for deriving and mapping topographic attributes Type de document : Article/Communication Auteurs : H. Mizukoshi, Auteur ; M. Aniya, Auteur Année de publication : 2002 Article en page(s) : pp 83 - 93 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] analyse d'image numérique [Termes IGN] détection de contours [Termes IGN] gradient de pente [Termes IGN] modèle hydrographique [Termes IGN] modèle numérique de surface [Termes IGN] modèle numérique de terrain [Termes IGN] profil topographique Résumé : (Auteur) Algorithms using contour-based DEMs to calculate slope gradient and aspect, and to classify and map slope profile and plan forms, were developed, which we call C-BATM (Contour-Based Automatic Terrain Mapping). These are important topographic attributes for various analyses and terrain-related hazard mapping. As a first step, a fall line, the line of the maximum gradients or a flow path, was generated from all data points of all contours. Then, using the fall line segment (between adjacent contours), slope gradient and aspect were calculated. The change in, slope gradients in three consecutives contours are the basis for classifying slope profile from into concave, planar and convex. Slope plan form was classified from the contour crenulation, using a point of inflection by examining the directional change of contour segments (line between two consecutive data points). In the process of classifying slope morphologies, the profile and plans curvatures were also calculated and recorded. Test results of these methods in mountainous areas indicate the advantage of using contour-based DEMs over the use of the grid-based DEM or TIN. These methods have a potential of much wider applications to terrain analyses and hydrological modeling. Numéro de notice : A2002-011 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans En ligne : https://www.asprs.org/wp-content/uploads/pers/2002journal/january/2002_jan_83-93 [...] Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=21928 [article]