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Observations of urban and suburban environments with global satellite scatterometer data / Son V. Nghiem in ISPRS Journal of photogrammetry and remote sensing, vol 64 n° 4 (July - August 2009)
[article]
Titre : Observations of urban and suburban environments with global satellite scatterometer data Type de document : Article/Communication Auteurs : Son V. Nghiem, Auteur ; D. Balk, Auteur Année de publication : 2009 Article en page(s) : pp 367 - 380 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique
[Termes IGN] banlieue
[Termes IGN] Bogota (Colombie)
[Termes IGN] Canton (Kouangtoung)
[Termes IGN] Dallas (Texas)
[Termes IGN] densité de population
[Termes IGN] densité du bâti
[Termes IGN] détection de contours
[Termes IGN] Dhaka (Bangladesh)
[Termes IGN] diffusomètre
[Termes IGN] échantillonnage d'image
[Termes IGN] éclairage public
[Termes IGN] image Landsat-ETM+
[Termes IGN] milieu urbain
[Termes IGN] Phoenix
[Termes IGN] Quito (Equateur)
[Termes IGN] télédétection en hyperfréquenceRésumé : (Auteur) A global and consistent characterization of land use and land change in urban and suburban environments is crucial for many fundamental social and natural science studies and applications. Presented here is a dense sampling method (DSM) that uses satellite scatterometer data to delineate urban and intraurban areas at a posting scale of about 1 km. DSM results are analyzed together with information on population and housing censuses, with Landsat Enhanced Thematic Mapper Plus (ETM+) imagery, and with Defense Meteorological Satellite Program (DMSP) night-light data. The analyses include Dallas-Fort Worth and Phoenix in the United States, Bogotá in Colombia, Dhaka in Bangladesh, Guangzhou in China, and Quito in Ecuador. Results show that scatterometer signatures correspond to buildings and infrastructures in urban and suburban environments. City extents detected by scatterometer data are significantly smaller than city light extents, but not all urban areas are detectable by the current SeaWinds scatterometer on the QuikSCAT satellite. Core commercial and industrial areas with high buildings and large factories are identified as high-backscatter centers. Data from DSM backscatter and DMSP nighttime lights have a good correlation with population density. However, the correlation relations from the two satellite datasets are different for different cities indicating that they contain complementary information. Together with night-light and census data, DSM and satellite scatterometer data provide new observations to study global urban and suburban environments and their changes. Furthermore, the capability of DSM to identify hydrological channels on the Greenland ice sheet and ecological biomes in central Africa demonstrates that DSM can be used to observe persistent structures in natural environments at a km scale, providing contemporaneous data to study human impacts beyond urban and suburban areas. Copyright ISPRS Numéro de notice : A2009-295 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2009.01.004 En ligne : https://doi.org/10.1016/j.isprsjprs.2009.01.004 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29925
in ISPRS Journal of photogrammetry and remote sensing > vol 64 n° 4 (July - August 2009) . - pp 367 - 380[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 081-09041 SL Revue Centre de documentation Revues en salle Disponible Selective omission of road features based on mesh density for automatic map generalization / J. Chen in International journal of geographical information science IJGIS, vol 23 n° 7-8 (july 2009)
[article]
Titre : Selective omission of road features based on mesh density for automatic map generalization Type de document : Article/Communication Auteurs : J. Chen, Auteur ; Y. Hu, Auteur ; Z. Li, Auteur ; R. Zhao, Auteur ; L. Meng, Auteur Année de publication : 2009 Article en page(s) : pp 1013 - 1032 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] 1:50.000
[Termes IGN] Chine
[Termes IGN] densité
[Termes IGN] généralisation cartographique automatisée
[Termes IGN] réseau routier
[Termes IGN] révision cartographique
[Termes IGN] route
[Vedettes matières IGN] GénéralisationRésumé : (Auteur) Selection of roads is an intractable generalization operation due to the difficulty in retaining the density difference and connectivity of a road network. This paper proposes a novel approach of selective omission for roads based on mesh density. The density of a road network and its local variations are calculated using meshes as units. Since maps at different scales usually reveal different densities, different density thresholds for road networks are determined on the basis of theoretical analysis and empirical study of mesh densities on maps at different scales. The selection process starts with the identification of the meshes that have a density beyond the threshold. The mesh with the largest density is first treated. Its bounding road segments are ordered according to their relative importance. The least important segment is eliminated. The remaining segments are then merged with the adjacent mesh, thus forming a new mesh. The selection procedure is repeated until none of the meshes has a density beyond the threshold. Such a process of eliminating road segments and merging meshes can ensure the road network connectivity. In this study, the meshes are classified depending on the types of road segment. For the different mesh types, their density thresholds are set to be different, which can be used as an indicator for the preservation of the density difference. This proposed approach considers topological, geometric and semantic properties of the road network. It was applied to two sets of road networks, and the results of selection are convincing. This methodology has now been adopted for the updating of 1:50,000 maps of China. Copyright Taylor & Francis Numéro de notice : A2009-344 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/13658810802070730 En ligne : https://doi.org/10.1080/13658810802070730 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29974
in International journal of geographical information science IJGIS > vol 23 n° 7-8 (july 2009) . - pp 1013 - 1032[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 079-09051 RAB Revue Centre de documentation En réserve L003 Disponible 079-09052 RAB Revue Centre de documentation En réserve L003 Disponible Density dependence on tree survival in an old-growth temperate forest in northeastern China / Jian Zhang in Annals of Forest Science, Vol 66 n° 2 (march 2009)
[article]
Titre : Density dependence on tree survival in an old-growth temperate forest in northeastern China Titre original : La survie des arbres dépend de la densité dans une ancienne forêt tempérée du nord-est de la Chine Type de document : Article/Communication Auteurs : Jian Zhang, Auteur ; Zhanqing Hao, Auteur ; I.-Fang Sun, Auteur ; Bo Song, Auteur ; Ji Ye, Auteur ; Buhang Li, Auteur ; Xugao Wang, Auteur Année de publication : 2009 Article en page(s) : n° 204 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Végétation
[Termes IGN] Chine
[Termes IGN] densité de la végétation
[Termes IGN] dépérissement
[Termes IGN] étage de végétation
[Termes IGN] forêt tempérée
[Termes IGN] mortalité
[Termes IGN] structure spatialeRésumé : (auteur) Density dependence is a major mechanism for shaping plant communities. However, its role in regulating diverse, mixed natural tree communities is less certain. In this study we investigated density-dependent effects in a large-scale (25 ha) old-growth temperate forest in northeastern China. Spatial patterns of neighborhood distribution in the plot were analyzed using various methods for inferring competition, including (1) pair correlation function to determine spatial patterns of pre-mortality and post-mortality and (2) neighborhood analysis of individuals to examine the extent to which tree survival is correlated with other covariates. Results showed that, for common species, 3 of 5 canopy species and 3 of 8 midstory and understory species were random in mortality. Negative density-dependent mortality was not found when trees reach 1 cm in DBH. There was no significant correlation for canopy species between tree survival and conspecific abundance, but largely positive correlations for midstory and understory species. In contrast, tree survival was found to negatively correlate with conspecific basal area for most species, indicating strong intraspecific competition. No strong interspecific density dependence was found in the forest. Numéro de notice : A2009-715 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1051/forest/2008086 Date de publication en ligne : 28/02/2009 En ligne : https://www.afs-journal.org/articles/forest/abs/2009/02/f08149/f08149.html Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=71944
in Annals of Forest Science > Vol 66 n° 2 (march 2009) . - n° 204[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité IFN-001-P000317 PER Revue Nogent-sur-Vernisson Salle périodiques Exclu du prêt Intelligent GIS for solving high-dimensional site selection problems using ant colony optimization techniques / X. Li in International journal of geographical information science IJGIS, vol 23 n°3-4 (march - april 2009)
[article]
Titre : Intelligent GIS for solving high-dimensional site selection problems using ant colony optimization techniques Type de document : Article/Communication Auteurs : X. Li, Auteur ; Jianhua He, Auteur ; X. Liu, Auteur Année de publication : 2009 Article en page(s) : pp 399 - 416 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG
[Termes IGN] aide à la décision
[Termes IGN] Chine
[Termes IGN] équipement collectif
[Termes IGN] optimisation par colonie de fourmis
[Termes IGN] siteRésumé : (Auteur) This paper presents a new method to solve site selection problems using ant colony optimization (ACO) techniques. Optimal spatial search for siting public facilities is a common task for urban planning. The objective is to find N optimal sites (targets) for sitting a facility so that the total benefits are maximized or the total costs are minimized. It is straightforward to use the brute-force method for identifying the optimal solution by enumerating all possible combinations. However, the brute-force method has difficulty in solving complex spatial search problems because of a huge solution space. Ant colony optimization can provide a useful tool for site selection. In this study, the integration of ACO with geographic information systems is proposed to include various types of spatial variables in the optimization. A number of modifications have also been introduced so that ACO can fit spatial allocation problems. The novelty of this research includes the adoption of the strategies of neighborhood pheromone diffusion, tabu table adjusting, and multi-scale optimization. This method has been applied to the allocation of a hypothetical facility in Guangzhou City, China. The experiment indicates that the proposed model has better performance than the single search and the genetic algorithm for solving common site search problems. Copyright Taylor & Francis Numéro de notice : A2009-156 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810801918491 En ligne : https://doi.org/10.1080/13658810801918491 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29786
in International journal of geographical information science IJGIS > vol 23 n°3-4 (march - april 2009) . - pp 399 - 416[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 079-09021 RAB Revue Centre de documentation En réserve L003 Disponible 079-09022 RAB Revue Centre de documentation En réserve L003 Disponible Modelling the great wall of China / Z. Wang in GIM international, vol 23 n° 2 (February 2009)
[article]
Titre : Modelling the great wall of China Type de document : Article/Communication Auteurs : Z. Wang, Auteur ; Y. Liu, Auteur ; L. Cao, Auteur Année de publication : 2009 Article en page(s) : pp 35 - 37 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] Chine
[Termes IGN] données lidar
[Termes IGN] modèle numérique de terrain
[Termes IGN] monument historique
[Termes IGN] télémétrie laser aéroporté
[Termes IGN] télémétrie laser terrestreRésumé : (Auteur) The Great Wall of China is one of the largest manmade wonders of the world, comprising many different and irregular structures. We employed airborne Lidar to produce highly accurate digital elevation models (DEMs) to identify areas requiring repair. A terrestrial laser scanner mounted on a tripod was used to improve the terrain model, especially for surfaces covered with dense vegetation. The combined use of airborne and terrestrial laser scanner produced DEMs with accuracies better than 10cm. Copyright Reed Business Information Numéro de notice : A2009-012 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29642
in GIM international > vol 23 n° 2 (February 2009) . - pp 35 - 37[article]Réservation
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