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Auteur C. Barber |
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Lidar elevation data for surface hydrologic modeling: resolution and representation issues / C. Barber in Cartography and Geographic Information Science, vol 32 n° 4 (October 2005)
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Titre : Lidar elevation data for surface hydrologic modeling: resolution and representation issues Type de document : Article/Communication Auteurs : C. Barber, Auteur ; A. Shortridge, Auteur Année de publication : 2005 Article en page(s) : pp 401 - 410 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique
[Termes IGN] données lidar
[Termes IGN] modèle hydrographique
[Termes IGN] modèle numérique de surfaceRésumé : (Auteur) This paper is concerned with the application of high spatial resolution elevation data derived from light detection and ranging technologies (lidar) to surface hydrologic modeling. In recent years, airborne lidar technology bas been employed to develop high accuracy digital elevation models (DEMs) with horizontal resolution on the order of a few meters. As with any spatial data product there are limits to the lidar's practical use that vary with the intended application. This paper considers potential issues and challenges for the use of lidar-derived DEMs in surface hydrologic modeling applications, such as characterizing flow direction and power, identifying sub-basins in a watershed, and calculating upstream contributing area and other variables. We compare results using conventional 30m DEMs and 6m lidar for a high relief study area and a low relief study area. Results are more comparable between these data sources, regardless of hydrologic operation, for the high relief area, while the similarity of results in the low relief area is dependent upon the particular operation. Post-processing on the lidar data successfully removed such flow obstacles as bridges that might have artificially impeded surface flow. An exploration of the effect of spatial resolution on results suggests that cell size is a more significant factor than production method. Numéro de notice : A2005-542 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1559/152304005775194692 En ligne : https://doi.org/10.1559/152304005775194692 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27678
in Cartography and Geographic Information Science > vol 32 n° 4 (October 2005) . - pp 401 - 410[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 032-05041 RAB Revue Centre de documentation En réserve L003 Disponible Evaluating alternative line simplification strategies for multiple representations of cartographic lines / C. Barber in Cartography and geographic information systems, vol 22 n° 4 (December 1995)
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Titre : Evaluating alternative line simplification strategies for multiple representations of cartographic lines Type de document : Article/Communication Auteurs : C. Barber, Auteur ; R. Cromley, Auteur ; R. Andrle, Auteur Année de publication : 1995 Article en page(s) : pp 276 - 290 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie numérique
[Termes IGN] approche hiérarchique
[Termes IGN] généralisation cartographique automatisée
[Termes IGN] lissage de courbe
[Termes IGN] objet géographique linéaire
[Termes IGN] représentation cartographiqueRésumé : (Auteur) Two basic strategies have been identified for handling multiple representations of line features in digital databases. Either a finite number of scale-dependent representations of cartographic lines can be explicitly stored, or a scale-independent database is generated from which subsequent scale representations can be extracted as needed. These two strategies parallel differences in hierarchical and non-hierarchical line simplification operators. Non-hierarchical line simplification can produce the most geometrically accurate simplification at any scale, while hierarchical operators are often associated with scale-independent databases. In this research, hierarchical and non-hierarchical line simplification operators are evaluated by comparing both the points retained by these different algorithms and the overall quality of the graphic portrayal for sample lines of different complexity and at different scales. Visual inspection of the results did not reveal any discernable difference at any scale for any line. Subsequent numerical analyses shows some differences but overall little geometric quality is lost by using a hierarchical operator as opposed to a non-hierarchical one and given the greater flexibility of scale representations that is possible, hierarchical methods appear to be more satisfactory. Numéro de notice : A1995-006 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1559/152304095782540230 En ligne : https://www.tandfonline.com/doi/abs/10.1559/152304095782540230 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=25736
in Cartography and geographic information systems > vol 22 n° 4 (December 1995) . - pp 276 - 290[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 032-95041 RAB Revue Centre de documentation En réserve L003 Disponible