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TitleEvaluation of casi and SFSI hyperspectral data for environmental and geological applications - two case studies
DownloadDownloads (Preprint)
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorStaenz, K; Neville, R A; Lévesque, J; Szeredi, T; Singhroy, V; Borstad, G A; Hauff, P
SourceCanadian Journal of Remote Sensing vol. 25, issue 3, 1999 p. 311-322,
Alt SeriesEarth Sciences Sector, Contribution Series 20042395
PublisherInforma UK Limited
Mediapaper; on-line; digital
File formatpdf
Subjectsmineral exploration; casi (Compact Airborne Spectrographic Imager); SFSI (Short-Wave Infra-Red Full Spectrum Imager)
Illustrationstables; diagrams; graphs; satellite imagery
Released2014 07 31
AbstractThe capabilities of two imaging spectrometers, the Compact Airborne Spectrographic Imager (casi) and the SWIR (Short-Wave Infra-Red) Full Spectrum Imager (SFSI), were evaluated for environmental and geological applications. Results from two case studies, one involving the identification of minerals at Cuprite, Nevada, the other an environmental characterization of a mine site and its rehabilitation near Sudbury, Ontario, are presented. SFSI SWIR II 9200 nm - 2400 nm) data were used for the mineral mapping study while (casi) visible and near infrared (VNIR) (450 nm - 900 nm) data were applied in the environmental study. The evaluation process included the retrieval of surface reflectances prior to the application of spectral unmixing for the identification of specific materials, and the subsequent validation of the extracted information. Results showed that the spectral features of the alteration minerals alunite, kaolinite, and buddingtonite could be clearly identified in the SFSI spectra and, hence, that these minerals could be mapped. Comparison of the mineral Classification map and that retrieved from Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) data showed generally good agreement. In addition, results derived from data demonstrated that vegetation, lime, oxidized tailings fresh tailings, and water could be discriminated with spectral unmixing. Validation of the environment study results against field samples indicates good quantitative agreement with respect to the percent ground cover of lime and of vegetation; the latter is used as an indicator of the level of vegetation regrowth and hence rehabilitation of the mine site. In addition, a qualitative verification of the oxidized tailings indicates a good match between results derived from the remotely sensed data and field checks. In general, the casi and SFSI instruments provide useful information for environmental and geological mapping purposes.

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