GEOSCAN, résultats de la recherche


TitreNew marine map series from the eastern Canadian continental shelf
AuteurTodd, B J; Kostylev, V E; Shaw, J
SourceGeohab 2005 - Sixth International Symposium on Marine Geological and Biological Habitat Mapping: agenda and abstracts; 2005 p. 89
LiensOnline - En ligne
Séries alt.Secteur des sciences de la Terre, Contribution externe 2004348
ÉditeurGeological Survey of Canada/Fisheries and Oceans Canada |a Sidney, BC, Canada (Sidney, BC, Canada)
RéunionGeohab 2005 - 6th International Symposium on Marine Geological and Biological Habitat Mapping; Sidney, BC; CA; mai 4-7, 2005
Mediapapier; CD-ROM; en ligne; numérique
SNRC10; 20
Lat/Long OENS -68.0000 -60.0000 44.0000 40.0000
Sujetsorganismes marins; milieux marins; pêcheries
ProgrammeLes géosciences à l'appui de la gestion des océans
Résumé(disponible en anglais seulement)
Marine environments need to be managed to obtain a balance between the preservation of natural resources and ecosystems, and appropriate use of those resources to meet the needs of human society. Detailed sea floor maps are required to enable local, regional
and federal resource managers to make informed judgements about the effect of different activities on marine habitat. To address this gap in knowledge, the Geological Survey of Canada has undertaken a national sea floor mapping program to cover selected offshore
areas of the Canadian continental shelf. The outcome of the program is the development of marine cartographic standards and publication of marine map series for distribution via the World Wide Web. A map series consists of four sheets: topography, backscatter
strength, surficial geology and benthic habitat. Topography and backscatter strength maps are derived from data collected using multibeam sonar systems. Geophysical, geological and biological groundtruth surveys provide the necessary field verification to create
interpretive surficial geology and benthic habitat maps. All data sets are geospatially assembled through the use of Geographic Information System (GIS) techniques. The GIS approach has become the standard mapping procedure for the integration of multidisciplinary data and identification of representative habitats, and their associated benthic species. On the Scotian Shelf on the eastern Canadian continental margin, the Browns Bank map series is complete and the German Bank map series is nearing completion. Mapping was undertaken on both of these banks because they support lucrative shellfish and groundfish fisheries, yet the benthic habitats on the banks were poorly understood. The decision by resource managers to open new fisheries areas on these banks required new, high resolution sea floor maps. The Browns Bank map series covers 3056 km2 and comprises four sheets at a scale of 1:100 000. German Bank, with a mapped area of 5320 km2, is divided into three 1:50 000 scale maps, each with four sheets for a total of twelve sheets.
Included on the map sheets are descriptive notes, topographic cross sections, interpreted geological cross sections and sea floor photographs representing typical habitat and benthic communities. This mapping approach is being applied to other areas of the
Canadian continental shelf to facilitate sea floor management.