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Orthophoto generation using Ikonos imagery and high-resolution DEM: a case study on volcanic hazard monitoring of Nysoros island (Greece) / S. Vassilopoulou in ISPRS Journal of photogrammetry and remote sensing, vol 57 n° 1-2 (November - December 2002)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 57 n° 1-2 (November - December 2002) . - pp 24 - 38 Titre : Orthophoto generation using Ikonos imagery and high-resolution DEM: a case study on volcanic hazard monitoring of Nysoros island (Greece) Type de document : Article/Communication Auteurs : S. Vassilopoulou, Auteur ; V. Dietrich, Auteur ; Emmanuel P. Baltsavias, Auteur ; Maria Pateraki, Auteur ; E. Lagios, Auteur ; I. Pacharidis, Auteur ; Lorenz Hurni, Auteur Année de publication : 2002 Article en page(s) : pp 24 - 38 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Orthophotographie, orthoimage [Termes IGN] cartographie des risques [Termes IGN] erreur moyenne quadratique [Termes IGN] GPS en mode cinématique [Termes IGN] Grèce [Termes IGN] image à résolution métrique [Termes IGN] image Ikonos [Termes IGN] modèle numérique de surface [Termes IGN] orthoimage [Termes IGN] orthorectification [Termes IGN] point d'appui [Termes IGN] point de vérification [Termes IGN] risque naturel [Termes IGN] surveillance géologique [Termes IGN] visualisation cartographique [Termes IGN] volcan [Termes IGN] zone à risque Résumé : (Auteur) Georeferenced highresolution satellite images can be used for acquisition of topographic information, navigation and visualisation for various environmental studies. The present study is part of the multidisciplinary EU project GEOWARN related to monitoring, warning and emergency planning for volcanic hazards in the island of Nisyros, Greece. Here, the main aim was the orthorectification of a 1m resolution pansharpened IKONOS Geo image of Nisyros island. For the orthorectification, a digital elevation model (DEM) with a cell size of 2 m and an RMS accuracy of ca. 3.5 m was used, as well as 38 selected ground control points (GCPs) measured with differential GPS. An objecttopixel space transformation using the ground control points was computed using two different models, a reliefcorrected affine transformation and the polynomial mapping functions of Kratky. These transformations were used for orthorectification and the orthopboto accuracy was evaluated using GCPs as check points. Postprocessing for radiometric improvement of the orthophotos was applied. The ortbophoto and the DEM served as basic tools for subsequent base mapping and visualisation. Copyright ISPRS Numéro de notice : A2002-281 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/S0924-2716(02)00126-0 En ligne : https://doi.org/10.1016/S0924-2716(02)00126-0 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22192 [article]

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