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TitleRelationship between net CO2 flux and satellite radiance measurements during FIFE '89
AuthorManak, D; Cihlar, J; Caramori, P; Desjardins, R
SourceCanadian Journal of Remote Sensing vol. 19, no. 1, 1993 p. 2-8,
Alt SeriesEarth Sciences Sector, Contribution Series 20041992
PublisherInforma UK Limited
Mediapaper; on-line; digital
File formatpdf
Released2014 08 01
AbstractThe objective of this study was to assess the relationship between satellite radiance measurements of vegetation and aircraft measurements of CO2 uptake. The study area was located in central Kansas, and it included a 15 km by 15 km grassland site, as well as a 75 km transect over various land cover types. During the summer of 1989, several CO2 flux data sets were obtained using the National Research Council of Canada's Twin Otter research aircraft. Normalized Difference, Difference, and Simple Ratio vegetation indices were computed from NOAA Advanced Very High Resolution Radiometer (AVHRR) and Landsat-5 Thematic Mapper (TM) images of this region. The satellite data were processed to obtain vegetation indices spatially coincident with the CO2 flux values.
A linear relationship was found between the vegetation indices and CO2 uptake over the grassland site. The relationship was near-linear for the 75 km transect over heterogeneous vegetation cover. About 80 percent of the variability in the CO2 flux over the grassland site was accounted for by the Normalized Difference Vegetation Index derived from the Landsat TM image. Simple Ratio yielded the highest correlations over the 75 km transect. The significance of these results and their relationship to other studies are discussed.

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