GEOSCAN, résultats de la recherche


TitreAn emerging paradigm for surifical mapping of Arctic Canada at the Geological Survey of Canada
AuteurRussell, H A J; Harris, J R
SourceProceedings of the Joint Annual Meeting of Geological Association of Canada, the Mineralogical Association of Canada, the Society of Economic Geologists and the Society for Geology Applied to Mineral Deposits ; Association géologique du Canada-Association minéralogique du Canada, Réunion annuelle, Programme et résumés 2011.
LiensOnline - En ligne
Séries alt.Ressources naturelles Canada, Contribution externe 20170149
ÉditeurAssociation géologique du Canada
RéunionJoint Annual Meeting of GAC, MAC, SEG and the Society for Geology Applied to Mineral Deposits; Ottawa; CA; mai 25-27, 2011
Mediapapier; en ligne; numérique
Sujetstechniques de cartographie; levés géologiques; télédétection; interprétation de photos aériennes; satellite LANDSAT; géologie des dépôts meubles/géomorphologie; géologie générale
ProgrammeBases de données couvrant les trois territoires (la télécartographie prédictive), GEM : La géocartographie de l'énergie et des minéraux
Résumé(disponible en anglais seulement)
Aerial photographic interpretation has been the cornerstone of surficial geological map production at the Geological Survey of Canada for 80 years. Developments in the past 20 years in computing technology, remote sensing, and digital elevation models is affording the opportunity for increased automation of the mapping process. This technological evolution has occurred at the same time that the mapping capacity of the GSC has been decreased by half of the 1970-1980's capacity. Consequently, to continue to meet the demand for map products new mapping methods are required. Traditionally, surficial mapping in arctic Canada has been undertaken at a scale of 1:250,000 that incorporate a genetic surficial material legend, landform mapping and iceflow history defined by landform analysis and field measurements (striations). Traditional maps based on stereo aerial photographic interpretation rely on analysis of tone, relief and spatial arrangement (pattern) in concert with field observations. This analysis relies on three elements, whereas traditional spectral image classification (Landsat) has been analysed based only on spectral response alone (tone). Within the Remote Predictive Mapping (RPM) project of Geo-Mapping for Energy and Minerals Program (GEMS) a methodology and data handling framework is being developed to enhance the GSC's mapping capabilities within the traditional field based 1:250000 scale mapping framework and also to provide improved synoptic scale mapping. With respect to RPM research, a variety of experiments are being undertaken using optical radar and topographic datasets to produce predictive surficial material maps over the Shultz Lake NTS 66A mapsheet, which is functioning as a test area for RPM. At regional scales mapping is reliant on public domain data and the emphasis within RPM is on improving classification and modelling approaches using this public domain and easy accessible data such as Landsat and MERIS complemented by topographic (CDED) data. A variety of statistical approaches are being experimented with to produce predictive surficial maps including advanced pixel and object based classification methods that rely on training areas of representative surficial material types. Legacy data are being employed as training datasets to advance landform analysis. Progress has been made in the quantitative analysis of eskers in Keewatin using topographic (CDED) data. The GSC is developing a RPM research network involving College GIS programs, university researchers, provincial agencies, and federal government labs to assist in developing methods and protocols for producing predictive geological maps of broad areas of Canada's North.