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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 IGN] bassin hydrographique [Termes IGN] données lidar [Termes IGN] données localisées 3D [Termes IGN] eau pluviale [Termes IGN] énergie solaire [Termes IGN] métropole [Termes IGN] modèle numérique de terrain [Termes IGN] secours d'urgence [Termes 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 Affiliation des auteurs : non IGN 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]

Qualitative GIS: An Open Framework Using SpatiaLite and Open Source GIS / Ryan Garnett in Transactions in GIS, vol 20 n° 1 (February 2016)  

Public [article]  inTransactions in GIS > vol 20 n° 1 (February 2016) . - pp 144 – 159 Titre : Qualitative GIS: An Open Framework Using SpatiaLite and Open Source GIS Type de document : Article/Communication Auteurs : Ryan Garnett, Auteur ; Pavlov Kanaroglou, Auteur Année de publication : 2016 Article en page(s) : pp 144 – 159 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique [Termes IGN] environnement de développement [Termes IGN] logiciel libre [Termes IGN] prise en compte du contexte [Termes IGN] SIG qualitatif [Termes IGN] SpatiaLite [Termes IGN] SQL [Termes IGN] système de gestion de base de données Résumé : (auteur) Qualitative GIS is a relatively new methodological approach for analyzing and visualizing qualitative data within a geographic context. Qualitative data can take many forms, including interviews, documents, photographs, and audio and video clips. Content analysis for example, is an effective qualitative method for analyzing text-based data. We argue that basic concepts, (i.e. how to store data, data requirements, visualization techniques, and modes of analysis) within qualitative GIS have not been adequately defined, rendering difficult the replication of work performed and hindering the development of incremental knowledge in the field. Database management systems provide a means for storing, managing, and analyzing qualitative GIS data. A standardized and well-designed open source database system provides a mechanism for qualitative GIS projects, ensuring consistency and project replication. Qualitative GIS data stored in a database allows for additional visualization options, such as geographic word clouds. To demonstrate the concepts we performed content analysis on Master Transportation Plans from Calgary and Montreal using SpatiaLite, an open source database system. We developed Structured Query Language (SQL) queries to generate and populate groups and theme tables within the SpatiaLite database. We present our database design and queries in the hopes that they will help others conducting qualitative GIS research. Numéro de notice : A2016-447 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/tgis.12163 En ligne : http://dx.doi.org/10.1111/tgis.12163 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81356 [article]

Visual accceptance of library-generated CityGML LOD3 building models / Ryan Garnett in Cartographica, vol 49 n° 4 (Winter 2014)  

Public [article]  inCartographica > vol 49 n° 4 (Winter 2014) . - pp 218 - 224 Titre : Visual accceptance of library-generated CityGML LOD3 building models Type de document : Article/Communication Auteurs : Ryan Garnett, Auteur ; Jason T. Freeburn, Auteur Année de publication : 2014 Article en page(s) : pp 218 - 224 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] CityGML [Termes IGN] données localisées 3D [Termes IGN] géométrie [Termes IGN] modèle conceptuel de données localisées [Termes IGN] modèle numérique du bâti [Termes IGN] niveau de détail [Termes IGN] qualité des données [Termes IGN] rendu réaliste [Termes IGN] texture d'image [Termes IGN] visualisation 3D [Vedettes matières IGN] Géovisualisation Résumé : (auteur) The acceptance of 3D building models is critical to all urban 3D visualization projects. Building models that are identified as unacceptable can increase the cost of the project, delay the delivery, and, in some cases, cancel the acceptance of the entire project. A 3D modelling approach of using representative textures and geometry rather than actual photorealistic textures and geometry was conducted to determine whether participants who frequent the building multiple times a week over a period of a year would be able to identify the visual difference. Three focus groups were established and used to evaluate the visual quality of the 3D building models. Participants were asked to rank the visual quality of the building, as well as identifying any geometry, texture, or overall visual quality problems. The participants from the three focus groups did not identify any texture or geometry mistakes present in the building models. The overall visual quality identified by the participants from the three focus groups was above average, suggesting that the 3D modelling approach is an effective means for modelling buildings with high visitation and significance. Numéro de notice : A2014-688 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/IMAGERIE/INFORMATIQUE Nature : Article DOI : 10.3138/carto.49.4.2522 En ligne : http://dx.doi.org/10.3138/carto.49.4.2522 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=75194 [article]

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