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TitleValidation of Canada-Wide LAI/FPAR Maps from Satellite Imagery
AuthorChen, J M; Brown, L; Cihlar, J; Leblanc, S GORCID logo; Hall, R J; Peddle, D; King, D; Trofymow, J A; Swift, EORCID logo; van der Sanden, J JORCID logo; Pavlic, G
SourceFourth International Airborne Remote Sensing Conference and Exhibition/21st Canadian Symposium on Remote Sensing, Ottawa, Ontario, Canada, 21-24 June; 1999.
Alt SeriesEarth Sciences Sector, Contribution Series 20042721
AbstractThe leaf area index (LAI) and the fraction of photosynthetically active radiation absorbed by the canopy (FPAR) are two of the surface paramaters which can be routinely derived from remote sensing measurements and have importance in climate, weather and ecological studies. Canada-wide LAI/FPAR maps are now being produced using cloud-free Advanced Very High Resolution Radiometer (AVHRR) imagery every 10 days at 1 km resolution. The archive of these products begins from 1993. To validate these products across Canada, a group of interested Canadian scientists was formed, and measurements of LAI and FPAR were made during the summer of 1988 in deciduous, conifer and mixed forests and in cropland. Common measurement standards using the commercial TRAC and LAI-200 instruments were followed. Nine Landsat TM scenes at 30 m resolution were used to locate ground sites and to facilitate the scaling to 1 km pixels. In this presentation, we will discuss methodologies for mapping LAI and FPAR using fine-resolution data and for validating coarse-resolution maps in consideration of surface heterogeneity.

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