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TitleDerivation and Evaluation of Coarse Resolution LAI Estimates over Canada
 
AuthorFernandes, R AORCID logo; Leblanc, S GORCID logo; Butson, C; Latifovic, R; Pavlic, G
SourceIGARSS 2002, Toronto, Canada, June 24-28; 2002.
Image
Year2002
Alt SeriesEarth Sciences Sector, Contribution Series 20043095
Documentbook
Lang.English
Mediapaper; CD-ROM
AbstractLeaf area index is a fundamental land surface parameter. Coarse (1km) resolution sensors currently offer sufficient repeat frequency to provide large area estimates of LAI within the growing season. We describe an approach to generation of Canada wide LAI estimates using SPOT-VEGETATION imagery. Relationships between surface LAI and optical vegetation indices are developed using a Canada wide surface LAI data set and Landsat TM and ETM+ imagery. LAI is estimated using indices derived from infrared reflectances so as to minimize atmospheric correction uncertainties. Additional indices based on visible reflectances are used to screen for environmental influences on the infrared surface reflectances. Supplemental 1km resolution land use maps are used to optimise LAI estimates. Comparison to a sampling of Landsat based LAI fields suggests total errors in LAI of 30%(1s). Absolute validation is performed by cross-validation using the surface data set. The derived LAI estimates are ~33% lower than similar MODIS LAI estimates over the BOREAS region.
GEOSCAN ID219897

 
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