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TitleDerivation of Land Cover Continuous Fields over Canada from SPOT-VGT Imagery
DownloadDownloads (Preprint)
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorFernandes, R AORCID logo; Latifovic, R; Fraser, RORCID logo
SourceIGARSS 2002, Toronto, Canada, June 24-28; 2002., Open Access logo Open Access
Alt SeriesEarth Sciences Sector, Contribution Series 20043096
Mediapaper; CD-ROM; on-line; digital
File formatpdf
Released2002 01 01
AbstractRecent comparisons of coarse (1 km) and fine (30m) resolution land cover maps across Canada indicate that single cover types rarely occupy more than 40% of a 1km pixel in forested areas. To address this aggregation problem we develop and apply a method for estimating continuous fields of vegetation structural characteristics using 1km resolution SPOT-VEGETATION (VGT) imagery. A sample of Landsat TM and ETM+ scenes stratified by ecozone is classified using a standard methodology to generate spatially distributed calibration centres. Neural networks, look-up-table labelling, and regression resulted in biases as large as 35% when calibrated using centers over 400km away. Only the linear least squares inversion approach produce a bias under 20%. An estimator based on a linear mixture model regularised by the a prior continuous field distribution over the calibration centres is developed. The regularisation parameter is defined by the spectral and spatial similarity of VGT reflectances between calibration centres and the regions being mapped. A strategy for mapping and validating Canada wide continuous fields using this method is described.

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