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Building boundary tracing and regularization from airborne lidar point clouds / A. Sampath in Photogrammetric Engineering & Remote Sensing, PERS, vol 73 n° 7 (July 2007)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 73 n° 7 (July 2007) . - pp 805 - 812 Titre : Building boundary tracing and regularization from airborne lidar point clouds Type de document : Article/Communication Auteurs : A. Sampath, Auteur ; J. Shan, Auteur Année de publication : 2007 Article en page(s) : pp 805 - 812 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes IGN] correction géométrique [Termes IGN] détection du bâti [Termes IGN] données lidar [Termes IGN] lasergrammétrie [Termes IGN] lissage de données [Termes IGN] Maryland (Etats-Unis) [Termes IGN] reconstruction 3D du bâti [Termes IGN] segmentation [Termes IGN] semis de points [Termes IGN] Toronto Résumé : (Auteur) Building boundary is necessary for the real estate industry, flood management, and homeland security applications. The extraction of building boundary is also a crucial and difficult step towards generating city models. This study presents an approach to the tracing and regularization of building boundary from raw lidar point clouds. The process consists of a sequence of four steps: separate building and non-building lidar points; segment lidar points that belong to the same building; trace building boundary points; and regularize the boundary. For separation, a slope based 1D bi-directional filter is used. The segmentation step is a region-growing approach. By modifying a convex hull formation algorithm, the building boundary points are traced and connected to form an approximate boundary. In the final step, all boundary points are included in a hierarchical least squares solution with perpendicularity constraints to determine a regularized rectilinear boundary. Our tests conclude that the uncertainty of regularized building boundary tends to be linearly proportional to the lidar point spacing. It is shown that the regularization precision is at 18 percent to 21 percent of the lidar point spacing, and the maximum offset of the determined building boundary from the original lidar points is about the same as the lidar point spacing. Limitation of lidar data resolution and errors in previous filtering processes may cause artefacts in the final regularized building boundary. This paper presents the mathematical and algorithmic formulations along with stepwise illustrations. Results from Baltimore city, Toronto city, and Purdue University campus are evaluated. Copyright ASPRS Numéro de notice : A2007-314 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.73.7.805 En ligne : http://dx.doi.org/10.14358/PERS.73.7.805 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28677 [article]

Interpretation of Spot-1 color composites for mapping defoliation of hardwood forests by gypsy moth / W.M. Ciesla in Photogrammetric Engineering & Remote Sensing, PERS, vol 55 n° 10 (october 1989)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 55 n° 10 (october 1989) . - pp 1465 - 1470 Titre : Interpretation of Spot-1 color composites for mapping defoliation of hardwood forests by gypsy moth Type de document : Article/Communication Auteurs : W.M. Ciesla, Auteur ; C.W. Dull, Auteur ; R.E. Acciavatti, Auteur Année de publication : 1989 Article en page(s) : pp 1465 - 1470 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] bande infrarouge [Termes IGN] carte de la végétation [Termes IGN] défoliation [Termes IGN] forêt tempérée [Termes IGN] image en couleur composée [Termes IGN] image SPOT [Termes IGN] Insecta [Termes IGN] Maryland (Etats-Unis) [Termes IGN] photo-interprétation [Termes IGN] photographie aérienne [Termes IGN] réflectance végétale [Termes IGN] système d'information géographique Numéro de notice : A1989-292 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article DOI : sans En ligne : https://www.asprs.org/wp-content/uploads/pers/1989journal/oct/1989_oct_1465-1470 [...] Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=25251 [article]