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TitleA comparison of automatic and supervised methods for extracting lithological end members from hyperspectral data: application to lithological mapping in southern Baffin Island, Nunavut
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorHarris, J R; Ponomarev, P; Shang, S; Budkewitsch, P; Rogge, D
SourceGeological Survey of Canada, Current Research (Online) no. 2006-C4, 2006, 19 pages; 1 CD-ROM, Open Access logo Open Access
PublisherNatural Resources Canada
Mediaon-line; CD-ROM; digital
File formatpdf (Adobe Acrobat Reader)
NTS25N/02; 25K/15
AreaBaffin Island; Meta Incognita Peninsula
Lat/Long WENS-69.0000 -68.5000 66.1667 62.8333
Subjectsgeophysics; geophysical surveys; reflectance; spectral analyses; remote sensing; mapping techniques; lithology
Illustrationssketch maps; spectra; plots; graphs; tables; flow charts; photographs
Released2006 09 01
AbstractThis paper compares two automatic methods (unsupervised classification and an end-member extraction algorithm) and a supervised method (ground collection of training areas followed by matched filter classification) for producing a spectral map over a small area in eastern Baffin Island in the Canadian Arctic. The spectral maps and automatically generated spectra used to produce the spectral maps are compared to the spectral map and spectra produced using the supervised approach.

Both the supervised and unsupervised methods discussed in this paper provide spectralmaps that provide similar lithological information when compared to the mapped geology. The supervised approach provides the results that are the most comparable to the mapped geology and this is not unexpected as this approach benefits from fieldwork and supporting geochemical and thin-section analysis.

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