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New methodologies for true orthophoto generation / A.F. Habib in Photogrammetric Engineering & Remote Sensing, PERS, vol 73 n° 1 (January 2007)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 73 n° 1 (January 2007) . - pp 25 - 36 Titre : New methodologies for true orthophoto generation Type de document : Article/Communication Auteurs : A.F. Habib, Auteur ; E.M. Kim, Auteur ; C.J. Kim, Auteur Année de publication : 2007 Article en page(s) : pp 25 - 36 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Orthophotographie, orthoimage [Termes IGN] artefact [Termes IGN] base de données localisées [Termes IGN] géoréférencement [Termes IGN] grande échelle [Termes IGN] mesure géométrique [Termes IGN] milieu urbain [Termes IGN] modèle numérique de surface [Termes IGN] modèle numérique du bâti [Termes IGN] orthoimage intégrale [Termes IGN] pas d'échantillonnage au sol [Termes IGN] relief Résumé : (Auteur) Orthophoto production aims at the elimination of sensor tilt and terrain relief effects from captured perspective imagery. Uniform scale and the absence of relief displacement in orthophotos make them an important component of GIS databases, where the user can directly determine geographic locations, measure distances, compute areas, and derive other useful information about the area in question. Differential rectification has been traditionally used for orthophoto generation. For large scale imagery over urban areas, differential rectification produces serious artifacts in the form of double mapped areas at object space locations with sudden relief variations, e.g., in the vicinity of buildings. Such artifacts are removed through true orthophoto generation methodologies which are based on the identification of occluded portions of the object space in the involved imagery. Existing methodologies suffer from several problems such as their sensitivity to the sampling interval of the digital surface model (DSM) as it relates to the ground sampling distance (GSD) of the imaging sensor. Moreover, current methodologies rely on the availability of a digital building model (DBM), which requires an additional and expensive pre-processing. This paper presents new methodologies for true orthophoto generation while circumventing the problems associated with existing techniques. The feasibility and performance of the suggested techniques are verified through experimental results with simulated and real data. Copyright ASPRS Numéro de notice : A2007-010 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.73.1.25 En ligne : https://doi.org/10.14358/PERS.73.1.25 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28376 [article]