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Extending marine GIS capabilities: 3D representation of fish aggregations using Delaunay tetrahedralisation and Alpha shapes / V. Carette in Geomatica, vol 62 n° 4 (December 2008)  

Public [article]  inGeomatica > vol 62 n° 4 (December 2008) . - pp 361 - 374 Titre : Extending marine GIS capabilities: 3D representation of fish aggregations using Delaunay tetrahedralisation and Alpha shapes Type de document : Article/Communication Auteurs : V. Carette, Auteur ; Mir Abolfazl Mostafavi, Auteur ; et al., Auteur Année de publication : 2008 Article en page(s) : pp 361 - 374 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG [Termes IGN] analyse de groupement [Termes IGN] habitat animal [Termes IGN] image acoustique [Termes IGN] modélisation 3D [Termes IGN] pêche [Termes IGN] poisson (faune aquatique) [Termes IGN] ressources aquatiques [Termes IGN] surveillance écologique [Termes IGN] système d'information géographique [Termes IGN] triangulation de Delaunay [Termes IGN] visualisation 3D Résumé : (Auteur) Geographic information systems (GIS) are generally used for representation, analysis and management of marine resource data. One of the most important resources intensively studied by marine biologists is fish stock dynamics. Fish aggregations are a fundamental component of fish stock dynamics that must be well understood to establish efficient recovery strategies in the context of declining aquatic resources. Despite many interesting capabilities of current GIS, these tools are prone to problems due to the 3D and dynamic nature of the marine data, including fisheries data. This paper proposes a new approach for modelling and visualizing fish aggregations in a 3D space. The proposed approach is based on an integrated approach using dynamic Delaunay tetrahedralization and the á-shapes 3D clustering algorithm. The proposed approach is first validated using several experimental data sets. Next, it is applied to acoustic fisheries data to extract, visualize and analyze fish aggregations. The proposed approach also has the potential for tracking and studying fish dynamics and behaviour, if needed. At the end of the paper, some results are presented, and the benefits and limitations of the proposed 3D model are discussed. Copyright Geomatica Numéro de notice : A2008-513 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.5623/geomat-2008-0042 En ligne : https://cdnsciencepub.com/doi/abs/10.5623/geomat-2008-0042 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29582 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
035-08041	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Water Modeler: a component of a coastal zone decision support system to generate flood-risk maps from storm surge events and sea-level rise / T.L. Webster in Geomatica, vol 62 n° 4 (December 2008)  

Public [article]  inGeomatica > vol 62 n° 4 (December 2008) . - pp 393 - 406 Titre : Water Modeler: a component of a coastal zone decision support system to generate flood-risk maps from storm surge events and sea-level rise Type de document : Article/Communication Auteurs : T.L. Webster, Auteur ; R. Mosher, Auteur ; M. Pearson, Auteur Année de publication : 2008 Article en page(s) : pp 393 - 406 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique [Termes IGN] données lidar [Termes IGN] inondation [Termes IGN] littoral [Termes IGN] modèle numérique de surface [Termes IGN] modèle stochastique [Termes IGN] montée du niveau de la mer [Termes IGN] Nouveau-Brunswick (Canada) [Termes IGN] Nouvelle-Ecosse (Canada) [Termes IGN] outil d'aide à la décision [Termes IGN] prévention des risques [Termes IGN] raz-de-marée Résumé : (Auteur) This paper outlines a new software tool, Water Modeler, which is a component of a Coastal Zone Decision Support System. The Water Modeler can analyze a time series of water-level records (tide gauge observations) to determine the risk associated with a high water level from a storm surge event or long-term sea-level rise. The new tool has been applied in two case studies in Nova Scotia, Canada, where coastal flood-risk maps have been derived from high-resolution LiDAR digital elevation models. The first case study is for Annapolis Royal on the Bay of Fundy side of the province, while the second looks at the Kingsburg area of Lunenburg County on the Atlantic shore. The Saint John, New Brunswick, and Halifax tide gauge records were used for Annapolis Royal and Kingsburg, respectively, in the Water Modeler to examine the risks of coastal flooding. The Groundhog Day storm of 1976, which caused coastal flooding around the Bay of Fundy, was used as a benchmark for Annapolis Royal. At current rates of sea-level rise, 22 cm/century, the average return period of this water level is 43 years (65 percent probability) and there is a very high probability (99 percent) that it will reoccur within 121 years. If relative sea-level rise rates increase to 80 cm/century from climate change, then the average return period reduces to 23 years, and there is a 99 percent probability of reoccurrence within 55 years. The benchmark storm used from the Halifax water record was Hurricane Juan, which occurred in September 2003. The cumulative flood-level probabilities were calculated for this water level and a return period of 95 years was determined, with an average return period of 52 years (65 percent probability) under current sea-level conditions. The combination of geomatics tools, such as high-resolution LiDAR digital elevation models (DEMs) for coastal flood inundation and the Water Modeler to estimate the associated risk, allows coastal communities to better plan for the future. Copyright Geomatica Numéro de notice : A2008-514 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.5623/geomat-2008-0044 En ligne : https://cdnsciencepub.com/doi/abs/10.5623/geomat-2008-0044 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29583 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
035-08041	RAB	Revue	Centre de documentation	En réserve L003	Disponible