Centre de documentation
scientifique

Dépouillements

New data sources for completing national topographic mapping of Northern Canada at 1:50,000 / D. Clavet in Geomatica, vol 65 n° 1 (March 2011)  

Public [article]  inGeomatica > vol 65 n° 1 (March 2011) . - pp 9 - 14 Titre : New data sources for completing national topographic mapping of Northern Canada at 1:50,000 Type de document : Article/Communication Auteurs : D. Clavet, Auteur Année de publication : 2011 Article en page(s) : pp 9 - 14 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] 1:50.000 [Termes IGN] Arctique [Termes IGN] Canada [Termes IGN] carte topographique [Termes IGN] couverture cartographique [Termes IGN] diffusion de données [Termes IGN] données vectorielles [Termes IGN] géoportail [Termes IGN] gestion des ressources [Termes IGN] image ERS [Termes IGN] image Landsat-ETM+ [Termes IGN] image Radarsat [Termes IGN] image SPOT-HRS [Termes IGN] modèle numérique de surface [Termes IGN] photographie aérienne Résumé : (Auteur) Complete topographic mapping coverage of Canada is essential as a basis for the sustainable development of its resources. In 2000, the unmapped areas at a scale of 1:50,000 in the Arctic islands in Nunavut and the Northwest Territories, amount to over 800,000 square kilometres, equivalent to approximately 1,500 map sheets. In 2003, a northern mapping project was launched to complete the topographic map coverage in Northern Canada. In order to explore all possible scenarios, the Centre for Topographic Information – Sherbrooke (CTIS) worked closely with the Canadian Space Agency and the private sector on various feasibility tests. After investigating multiple data sources, the combination of existing aerial photography, LANDSAT 7 ETM+, SPOT5/HRS imagery, interferometric pairs of ERS 1-2 tandem and RADARSAT-2 imagery were chosen for planimetric data and Canadian Digital Elevation Data (CDED) acquisition. In 2004, mapping contracts were carried out on a test site and positive results from these tests initiated the production of the unmapped areas of Canada. The planimetric vector data are available on the GeoGratis Web portal and the CDED data sets are available on the GeoBase Web portal. Numéro de notice : A2011-536 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.5623/cig2011-004 En ligne : https://doi.org/10.5623/cig2011-004 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31430 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
035-2011011	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Detecting water bodies on Radarsat imagery / G. Kuang in Geomatica, vol 65 n° 1 (March 2011)  

Public [article]  inGeomatica > vol 65 n° 1 (March 2011) . - pp 15 - 25 Titre : Detecting water bodies on Radarsat imagery Type de document : Article/Communication Auteurs : G. Kuang, Auteur ; J. Li, Auteur ; Z. He, Auteur Année de publication : 2011 Article en page(s) : pp 15 - 25 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications [Termes IGN] détection de contours [Termes IGN] image radar moirée [Termes IGN] image Radarsat [Termes IGN] plan d'eau [Termes IGN] précision des données Résumé : (Auteur) This paper presents a novel geodesic active contour (GAC) model based on an edge detector for rapid detection of water bodies from spaceborne synthetic aperture radar (SAR) imagery with high speckle noise. The original edge indicator function based on gradients is replaced by an edge indicator function based on the ratio of exponentially weighted averages (ROEWA) operator. Thus, the capability of edge detection and the accuracy of locating edges are greatly improved, which makes the model more appropriate for SAR images. In addition, an enhancing term is added to the original model’s energy function in order to boost the strength for the contour’s evolution. An unconditionally stable additive operator splitting (AOS) scheme and a fast algorithm for re-initialization of the level set function are adopted, which not only enhances the model’s stability, but also speeds up the model’s convergence remarkably. The experimental results on simulated and real RADARSAT-1/-2 images show its efficiency and accuracy. Numéro de notice : A2011-537 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.5623/cig2011-005 En ligne : https://cdnsciencepub.com/doi/pdf/10.5623/cig2011-005 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31431 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
035-2011011	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Encouraging transdisciplinary participation using an open source cybercartographic toolkit: The atlas of the lake Huron treaty relationship process / Glenn Brauen in Geomatica, vol 65 n° 1 (March 2011)  

Public [article]  inGeomatica > vol 65 n° 1 (March 2011) . - pp 27 - 45 Titre : Encouraging transdisciplinary participation using an open source cybercartographic toolkit: The atlas of the lake Huron treaty relationship process Type de document : Article/Communication Auteurs : Glenn Brauen, Auteur ; Stephanie Pyne, Auteur ; A. Hayes, Auteur ; J. Fiset, Auteur ; David Ruxton Fraser Taylor, Auteur Année de publication : 2011 Article en page(s) : pp 27 - 45 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique web [Termes IGN] approche participative [Termes IGN] atlas numérique [Termes IGN] Canada [Termes IGN] cartographie par internet [Termes IGN] logiciel libre Résumé : (Auteur) Digital web atlases can incorporate perspectives derived from diverse participants or communities to create and present narratives using qualitative and quantitative information structured around a set of maps as organizational and analytical tools. Development of such an atlas requires a transdisciplinary team tor contend with complexity in subject matter, technologies, and project dynamics. Technologies required are potentially as much an obstacle to some potential participants as they may be necessary to the fulfilment of a project’s outreach and communication goals. This paper describes the Cybercartographic Atlas of the Lake Huron Treaty Relationship Process, the open source atlas toolkit used to implement it, and features of the toolkit that are intended to encourage transdisciplinary participation. The discussion explicitly addresses issues related to the iterative processes, at multiple scales, required to develop atlas projects within an academic research setting while using and creating open source software. Numéro de notice : A2011-538 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.5623/cig2011-006 En ligne : https://doi.org/10.5623/cig2011-006 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31432 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
035-2011011	RAB	Revue	Centre de documentation	En réserve L003	Disponible