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Auteur M.P. Finn |
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Projecting global datasets to achieve equal areas / E. Lynn Usery in Cartography and Geographic Information Science, vol 30 n° 1 (January 2003)
[article]
Titre : Projecting global datasets to achieve equal areas Type de document : Article/Communication Auteurs : E. Lynn Usery, Auteur ; M.P. Finn, Auteur ; et al., Auteur Année de publication : 2003 Article en page(s) : pp 69 - 79 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie numérique
[Termes IGN] analyse comparative
[Termes IGN] coordonnées planes
[Termes IGN] coordonnées sphériques
[Termes IGN] données localisées numériques
[Termes IGN] données maillées
[Termes IGN] projectionRésumé : (Auteur) Scientists routinely accomplish global modeling in the raster domain, but recent research has indicated that the transformation of large areas through map projection equations leads to errors. This research attempts to gauge the extent of map projection and resampling effects on the tabulation of categorical areas by comparing the results of three datasets for seven common projections. The datasets, Global Land Cover, Holdridge Life Zones, and Global Vegetation, were compiled at resolutions of 30 arcsecond, 1/2 degree, and 1 degree, respectively. These datasets were projected globally from spherical coordinates to plane representations. Results indicate significant problems in the implementation of global projection transformations in commercial software, as well as differences in areal accuracy across projections. The level of raster resolution directly affects the accuracy of areal tabulations, with higher resolution yielding higher accuracy. If the raster resolution is high enough for individual pixels to approximate points, the areal error tends to zero. The 30arcsecond cells appear to approximate this condition. Numéro de notice : A2003-053 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1559/152304003100010956 En ligne : https://doi.org/10.1559/152304003100010956 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22349
in Cartography and Geographic Information Science > vol 30 n° 1 (January 2003) . - pp 69 - 79[article]Réservation
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