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Combined use of Quickbird and lidar data for mapping a urban environment / N.B. Da Luz in Revue Française de Photogrammétrie et de Télédétection, n° 198 - 199 (Septembre 2012)

Public [article]  inRevue Française de Photogrammétrie et de Télédétection > n° 198 - 199 (Septembre 2012) . - pp 78 - 87 Titre : Combined use of Quickbird and lidar data for mapping a urban environment Type de document : Article/Communication Auteurs : N.B. Da Luz, Auteur ; D.J. Dos Santos, Auteur ; A.L. De Mendonça, Auteur ; A.F. Buffara Antunes, Auteur ; H. Araki, Auteur ; Q. Chen, Auteur Année de publication : 2012 Article en page(s) : pp 78 - 87 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] carte d'occupation du sol [Termes IGN] cartographie urbaine [Termes IGN] classification par arbre de décision [Termes IGN] données lidar [Termes IGN] données localisées 3D [Termes IGN] image Quickbird [Termes IGN] milieu urbain [Termes IGN] modèle numérique de surface [Termes IGN] Parana (Brésil) [Termes IGN] segmentation d'image [Termes IGN] semis de points Résumé : (Auteur) High resolution satellite imagery and airborne Lidar data can characterize the earth surface with unprecedented details in spatial and structure information, respectively. However, most studies have used them separately instead of in combination for land surface mapping. Considering their highly complementary nature, it is critical to investigate whether and how the integration of both can improve the accuracy of land cover and land use (LCLU) mapping. This study explored the use of Quickbird imagery and airborne Lidar data for mapping a complex urban environment in the City of Curitiba, Parana State, Southern Brazil, which is composed of secondary shrub vegetation, grass and climax primary Araucaria forests combined with urban objects such as roads and buildings. Airborne Lidar data were processed to generate DEM, DSM (Digital Surface Model), and DHM (Digital Height Model). The DSM generated from Lidar data were used to orthorectify Quickbird image with photogrammetric skills. A large number of metrics are generated from Lidar DHM, Lidar point cloud, Lidar intensity, and Quickbird imagery using object oriented segmentation approaches. Due to their power in handling non-parametric data, decision-tree based approaches were chosen to select the most relevant metrics and build rules for classification. It was found that the fusion of both types of data with decision trees increased the accuracy by 5 to 15% and resulted in an overall accuracy over 90%. Taking into account the increasing accessibility of Quickbird and airborne Lidar data, it is expected the methodology developed in this study has profound impacts in shifting our current paradigm in LCLU mapping. Numéro de notice : A2012-427 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31873 [article]

Contributions of remote sensing to the cartographic development of the Brazilian territory: an introductory overview / M.C. Bonato Brandalize in Revue Française de Photogrammétrie et de Télédétection, n° 198 - 199 (Septembre 2012)  

Public [article]  inRevue Française de Photogrammétrie et de Télédétection > n° 198 - 199 (Septembre 2012) . - pp 2 - 7 Titre : Contributions of remote sensing to the cartographic development of the Brazilian territory: an introductory overview Type de document : Article/Communication Auteurs : M.C. Bonato Brandalize, Auteur ; A.F. Buffara Antunes, Auteur Année de publication : 2012 Article en page(s) : pp 2 - 7 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] Amazonie [Termes IGN] Brésil [Termes IGN] équipement géographique de base [Termes IGN] image CBERS [Termes IGN] territoire Résumé : (Auteur) The Geographic Service Directory (DSG), in conjunction with the Brazilian Institute of Geography and Statistics (IBGE), are responsible for the systematic mapping of the Brazilian territory (scales 1:1.000.000 to 1:25.000) since their creation, respectively, in 1890 and 1934. Considering their long trajectory in establishing the National Cartographic System, encompassing several topographic mapping projects through the last century, most of all based in photogrammetric coverages, this same territory is considered to be out of date in terms of cartographic products since the 80's decade. This out of date can be translated in numbers that can factually indicate the chaotic situation that planners and managers in general are experiencing nowadays in Brazil. In this manner, although the Brazilian territory is completely covered, since 1922, at 1:1.000.000 scale (46 charts), the most up-to-date products for this scale are from 1998, when they were updated based on remote sensing images. In the other hand, greater scales like 1:100.000, 1:50.000 and 1:25.000, which cover respectively 75%, 14 % and 1% of the Brazilian territory, are from periods comprehended between 1908 and 1985, most of them with more than 30 years old and never updated. The lack of geographic information at such important scales submits regional and local development as much as environmental management and monitoring to plans and actions based on unreliable and untrue spatial information. Initiatives from the federal government in order to solve some of the environmental management and monitoring problems, especially in the Amazon Region, have culminated on projects based exclusively on remote sensing techniques, like RADAM (Radar in Amazon) and SIVAM (Amazon Vigilance System). Another initiative relies, since 2006, on the cooperation agreement between IBGE and the Alaska Satellite Facility (ASF), aiming the distribution of remote sensing images to Federal Government agencies, research institutions and other non commercial users in Brazil. These images intend to help the acceleration of the territory mapping process and its updating, allowing more efficient governmental actions planning. In a country where cartographic development is running far away behind the social and economic ones, initiatives like these must be critically analyzed and discussed. That is the topic of this article. Numéro de notice : A2012-418 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.52638/rfpt.2012.66 Date de publication en ligne : 21/04/2014 En ligne : https://doi.org/10.52638/rfpt.2012.66 Format de la ressource électronique : URL Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31864 [article]