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A multispectral and multiscale morphological index for automatic building extraction from multispectral GeoEye-1 imagery / X. Huang in Photogrammetric Engineering & Remote Sensing, PERS, vol 77 n° 7 (July 2011)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 77 n° 7 (July 2011) . - pp 721 - 732 Titre : A multispectral and multiscale morphological index for automatic building extraction from multispectral GeoEye-1 imagery Type de document : Article/Communication Auteurs : X. Huang, Auteur ; L. Zhang, Auteur Année de publication : 2011 Article en page(s) : pp 721 - 732 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] détection du bâti [Termes IGN] extraction automatique [Termes IGN] image Geoeye [Termes IGN] image multibande [Termes IGN] reconstruction 3D du bâti [Termes IGN] seuillage d'image [Termes IGN] Wuhan (Chine) Résumé : (Auteur) This study proposes a novel morphological building index (MBl) for automatic building extraction from high-resolu-tion remotely sensed imagery. The basic idea of MBl is to build a relationship between the implicit characteristics of buildings (e.g., brightness, size, and contrast) and the properties of morphological operators (e.g., reconstruction, granulometry, and directionality). Buildings are extracted by performing a threshold on the MBl feature image. Subsequently, the shape features, such as area and length width ratio, are used to refine the binary building map. In order to validate the proposed algorithm, a comparative study was performed between MBl, a recently developed texture-derived built-up presence index (PanTex), and the widely used object-based approach. Experiments were conducted on a multispectral GeoEye-1 image, covering a study area of 5.5 km by 5.3 km in Hongshan district of Wuhan, central China. In experiments, MBl achieved satisfactory results and outperformed other algorithms in terms of both accuracies and visual inspection. The effect: of parameters of mbi were also analyzed in detail, includ-ing directions, sizes and the binaryzation threshold. Numéro de notice : A2011-314 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.77.7.721 En ligne : https://doi.org/10.14358/PERS.77.7.721 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31093 [article]

A slope-based method for matching elevation surfaces / D. Streutker in Photogrammetric Engineering & Remote Sensing, PERS, vol 77 n° 7 (July 2011)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 77 n° 7 (July 2011) . - pp 721 - 732 Titre : A slope-based method for matching elevation surfaces Type de document : Article/Communication Auteurs : D. Streutker, Auteur ; N. Glenn, Auteur ; R. Shresta, Auteur Année de publication : 2011 Article en page(s) : pp 721 - 732 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes IGN] analyse comparative [Termes IGN] appariement de données localisées [Termes IGN] appariement géométrique [Termes IGN] données lidar [Termes IGN] hauteur de vol [Termes IGN] Idaho (Etats-Unis) [Termes IGN] pente [Termes IGN] reconstruction d'objet [Termes IGN] recouvrement d'images Résumé : (Auteur) A method is presented for the co-registration of overlapping elevation surfaces based on local slope analysis. Comparison and statistical analysis of local slope versus local elevation difference between overlapping surfaces allows for the estimation of both vertical and horizontal offsets between the two surfaces. This method is then used to re-align the flightlines of a Light Detection and Ranging (lidar) dataset collected in southern Idaho resulting in a dataset with significantly higher accuracy than the original. The relative horizontal accuracy is doubled, with a final value of approximately 25 to 30 cm, while the relative vertical accuracy is improved by several centimeters to a final valm of approximately 6 to 7 cm. Numéro de notice : A2011-315 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.77.7.743 En ligne : https://doi.org/10.14358/PERS.77.7.743 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31094 [article]