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TitleA comparison of different remotely sensed data for classifying bedrock types in Canada's Arctic: Application of the Robust Classification Method and Random Forests
AuthorHarris, J R; He, J X; Rainbird, RORCID logo; Behnia, P
SourceGeoscience Canada vol. 41, no. 4, 2014 p. 557-584, Open Access logo Open Access
Alt SeriesEarth Sciences Sector, Contribution Series 20160327
PublisherGeological Association of Canada
MeetingGeological Association of Canada - Mineralogical Association of Canada Joint Annual Meeting; Fredericton; CA; May 21-23, 2014
Mediapaper; on-line; digital
File formatpdf
Subjectsgeophysics; arctic geology; climate, arctic; remote sensing; vegetation
ProgramGEM: Geo-mapping for Energy and Minerals PGE/Base Metals - Victoria Island (NWT and Nunavut)
Released2014 12 03
AbstractThe Geological Survey of Canada, under the Remote Predictive Mapping project of the Geo-mapping for Energy and Minerals program, Natural Resources Canada, has the mandate to produce up-to-date geoscience maps of Canada's territory north of latitude 60°. Over the past three decades, the increased availability of space-borne sensors imaging the Earth's surface using increasingly higher spatial and
spectral resolutions has allowed geologic remote sensing to evolve from being primarily a qualitative discipline to a quantitative discipline based on the computer analysis of digital images. Classification of remotely sensed data is a well-known and common image processing application that has been used since the early 1970s, concomitant with the launch of the first Landsat (ERTS) earth observational satellite. In this study, supervised classification is employed using a new algorithm known as the Robust Classification
Method (RCM), as well as a Random Forest (RF) classifier, to a variety of remotely sensed data including Landsat-7, Landsat-8, Spot-5, Aster and airborne magnetic imagery, producing predictions (classifications) of bedrock lithology and Quaternary cover in central Victoria Island, Northwest Territories. The different data types are compared and contrasted to evaluate how well they classify various lithotypes and surficial materials; these evaluations are validated by confusion analysis (confusion matrices) as well as by comparing the eneralized classifications with the newly produced geology map of the study area. In addition, three new Multiple Classification System (MCS) methods are proposed that leverage the best characteristics of all remotely sensed data used for classification.

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