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Using Network Segments in the Visualization of Urban Isochrones / Jeff Allen in Cartographica, vol 53 n° 4 (winter 2018)  

Public [article]  inCartographica > vol 53 n° 4 (winter 2018) . - pp 262 - 270 Titre : Using Network Segments in the Visualization of Urban Isochrones Type de document : Article/Communication Auteurs : Jeff Allen, Auteur Année de publication : 2018 Article en page(s) : pp 262 - 270 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes descripteurs IGN] accessibilité [Termes descripteurs IGN] carte de zones isochrones [Termes descripteurs IGN] cartographie urbaine [Termes descripteurs IGN] données localisées [Termes descripteurs IGN] données ouvertes [Termes descripteurs IGN] mobilité urbaine [Termes descripteurs IGN] OpenStreetMap [Termes descripteurs IGN] QGIS [Termes descripteurs IGN] réseau de transport [Termes descripteurs IGN] Toronto [Termes descripteurs IGN] transport urbain [Vedettes matières IGN] Géovisualisation Résumé : (Auteur) Since the early twentieth century, thematic mapping techniques such as isochrones have been used for visualizing the accessibility and mobility provided by urban transportation networks. These maps typically depict the area accessible from a point within a certain time or distance threshold. This article details a design alternative to conventional isochrones, which links travel times to network edges. Benefits of this technique include highlighting the network structure of transport networks and comparing travel times for different travel scenarios. This article details methods for producing these maps using free and open-source data and software and provides examples of visualizing different accessibility scenarios in Toronto, Canada. Numéro de notice : A2018-576 Thématique : GEOMATIQUE/URBANISME Nature : Numéro de périodique DOI : 10.3138/cart.53.4.2018-0013 date de publication en ligne : 20/02/2019 En ligne : https://doi.org/10.3138/cart.53.4.2018-0013 Format de la ressource électronique : URL Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=92305 [article]

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LiDAR, a technology to assist with smart cities and climate change resilience: a case study in an urban metropolis / Ryan Garnett in ISPRS International journal of geo-information, vol 7 n° 5 (May 2018)  

Public [article]  inISPRS International journal of geo-information > vol 7 n° 5 (May 2018) Titre : LiDAR, a technology to assist with smart cities and climate change resilience: a case study in an urban metropolis Type de document : Article/Communication Auteurs : Ryan Garnett, Auteur ; Matthew D. Adams, Auteur Année de publication : 2018 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes descripteurs IGN] bassin hydrographique [Termes descripteurs IGN] données lidar [Termes descripteurs IGN] données localisées 3D [Termes descripteurs IGN] eau pluviale [Termes descripteurs IGN] énergie solaire [Termes descripteurs IGN] métropole [Termes descripteurs IGN] modèle numérique de terrain [Termes descripteurs IGN] secours d'urgence [Termes descripteurs IGN] Toronto Résumé : (Auteur) In this paper, we demonstrate three unique use cases of LiDAR data and processing, which can be implemented in an urban metropolis to determine the challenges that are associated with climate change. LiDAR data for the City of Toronto were collected in April 2015 with a density of 10 points/m2. We utilized both a digital terrain model and a bare earth digital elevation model in this work. The first case study estimated storm water, in which we compared flow accumulation values and catchment areas generated with a 20-m DEM and a 1-m LiDAR DEM. The finer resolution DEM demonstrated that the urban street features play a significant role in flow accumulation by directing flows. Urban catchment areas were found to occur on spatial scales that were smaller than the 20-m DEM cell size. For the second case study, the solar potential in the City of Toronto was calculated based on the slope and aspect of each land parcel. According to area, 56% of the city was found to have high solar potential, with 33% and 11% having medium and low solar potential. For the third case study, we calculated the building heights for 16,715 high-rise buildings in Toronto, which were combined with ambulance and fire emergency response times required to reach the base of the building. All buildings that had more than 17 stories were within a 5-min response time for both fire and ambulance services. Only 79% and 88% of these buildings were within a 3-min response time for ambulance and fire emergencies, respectively. LiDAR data provides a highly detailed record of the built urban environment and can provide support in the planning and assessment of climate change resilience activities. Numéro de notice : A2018-343 Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.3390/ijgi7050161 date de publication en ligne : 24/04/2018 En ligne : https://doi.org/10.10.3390/ijgi7050161 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90565 [article]

Neighborhood greenspace and health in a large urban center / Omid Kardan in Scientific reports, vol 5 (2015)  

Public [article]  inScientific reports > vol 5 (2015) Titre : Neighborhood greenspace and health in a large urban center Type de document : Article/Communication Auteurs : Omid Kardan, Auteur ; Peter Gozdyra, Auteur ; Bratislav Misic, Auteur ; et al., Auteur Année de publication : 2015 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes descripteurs IGN] arbre (flore) [Termes descripteurs IGN] croisement spatial [Termes descripteurs IGN] densité de la végétation [Termes descripteurs IGN] espèce végétale [Termes descripteurs IGN] milieu urbain [Termes descripteurs IGN] santé [Termes descripteurs IGN] Toronto Résumé : (auteur) Studies have shown that natural environments can enhance health and here we build upon that work by examining the associations between comprehensive greenspace metrics and health. We focused on a large urban population center (Toronto, Canada) and related the two domains by combining high-resolution satellite imagery and individual tree data from Toronto with questionnaire-based self-reports of general health perception, cardio-metabolic conditions and mental illnesses from the Ontario Health Study. Results from multiple regressions and multivariate canonical correlation analyses suggest that people who live in neighborhoods with a higher density of trees on their streets report significantly higher health perception and significantly less cardio-metabolic conditions (controlling for socio-economic and demographic factors). We find that having 10 more trees in a city block, on average, improves health perception in ways comparable to an increase in annual personal income of $10,000 and moving to a neighborhood with $10,000 higher median income or being 7 years younger. We also find that having 11 more trees in a city block, on average, decreases cardio-metabolic conditions in ways comparable to an increase in annual personal income of $20,000 and moving to a neighborhood with $20,000 higher median income or being 1.4 years younger. Numéro de notice : A2015-499 Thématique : FORET/GEOMATIQUE Nature : Article En ligne : http://www.nature.com/articles/srep11610 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=77326 [article]

Construction of digital 3D highway model using stereo IKONOS satellite imagery / A. Shaker in Geocarto international, vol 26 n° 1 (February 2011)  

Public [article]  inGeocarto international > vol 26 n° 1 (February 2011) . - pp 49 - 67 Titre : Construction of digital 3D highway model using stereo IKONOS satellite imagery Type de document : Article/Communication Auteurs : A. Shaker, Auteur ; W. Yan, Auteur ; S. Easa, Auteur Année de publication : 2011 Article en page(s) : pp 49 - 67 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes descripteurs IGN] autoroute [Termes descripteurs IGN] extraction semi-automatique [Termes descripteurs IGN] géoréférencement indirect [Termes descripteurs IGN] Hong-Kong [Termes descripteurs IGN] image Ikonos [Termes descripteurs IGN] modèle géométrique de prise de vue [Termes descripteurs IGN] modèle numérique de surface [Termes descripteurs IGN] modèle par fonctions rationnelles [Termes descripteurs IGN] pansharpening (fusion d'images) [Termes descripteurs IGN] point d'appui [Termes descripteurs IGN] signalisation routière [Termes descripteurs IGN] Toronto Résumé : (Auteur) This study aims to assess the accuracy of using stereo high resolution satellite imagery for extracting the highway profiles and plans and constructing accurate 3D highway visualization model. Two stereo-pair IKONOS satellite images for Hong Kong and Toronto are geo-referenced by using a number of ground control points acquired by global positioning system measurements. A polynomial-based generic pushbroom model and rational function model are used to perform the sensor orientation, respectively. The highway alignments are extracted semi-automatically using stereoscopic measurements, and a 3D digital model along the highway is constructed. It is found that the highway alignments retrieved from the stereo IKONOS images result in less than 1-m root mean squared error in most of the cases in the horizontal and vertical directions. Near half-pixel accuracy can be achieved by using pansharpening stereo satellite imagery and under the condition that clear road surface markings can be identified along the highway. Numéro de notice : A2011-036 Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/10106049.2010.537785 date de publication en ligne : 04/12/2010 En ligne : https://doi.org/10.1080/10106049.2010.537785 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30817 [article]

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A geographic visualization approach to multi-criteria evaluation of urban quality of life / C. Rinner in International journal of geographical information science IJGIS, vol 21 n° 8 (september 2007)

Public [article]  inInternational journal of geographical information science IJGIS > vol 21 n° 8 (september 2007) . - pp 907 - 919 Titre : A geographic visualization approach to multi-criteria evaluation of urban quality of life Type de document : Article/Communication Auteurs : C. Rinner, Auteur Année de publication : 2007 Article en page(s) : pp 907 - 919 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes descripteurs IGN] aide à la décision [Termes descripteurs IGN] analyse multicritère [Termes descripteurs IGN] classification ascendante hiérarchique [Termes descripteurs IGN] évaluation des données [Termes descripteurs IGN] milieu urbain [Termes descripteurs IGN] Toronto [Termes descripteurs IGN] visualisation Résumé : (Auteur) This paper proposes to use principles of geographic visualization in conjunction with multi-criteria evaluation methods to support expert-level spatial decision-making. Interactive maps can be combined with analytical tools to explore various settings of multi-criteria evaluation parameters that define different decision-making strategies. In a case study, the analytic hierarchy process (AHP) is used to calculate composite measures of urban quality of life (QoL) for neighbourhoods in Toronto. The AHP allows for an interactive exploration of decision-making strategies, while offering a view on spatial patterns in the evaluation results. In particular, an interactive blending between a classical and a contemporary QoL model is supported. This feature is used in a pilot study to assess the usefulness of geographic visualization in urban QoL evaluation. Three user interviews provide positive feedback on the utility and usability of the tool that was operated by the investigator. Copyright Taylor & Francis Numéro de notice : A2007-324 Thématique : GEOMATIQUE Nature : Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28687 [article]

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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)

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The use of structural information for improving land-cover classification accuracies at the rural-urban fringe / P. Gong in Photogrammetric Engineering & Remote Sensing, PERS, vol 56 n° 1 (january 1990)

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Performance analyses of probabilistic relaxation methods for land-cover classification / Peng gong in Remote sensing of environment, vol 30 n° 1 (01/10/1989)

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Accuracy assessment of Landsat-based visual change detection methods applied to the rural-urban fringe / L.R. Martin in Photogrammetric Engineering & Remote Sensing, PERS, vol 55 n° 2 (february 1989)

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