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JOURNAL OF GEOPHYSICAL RESEARCH,
VOL. 111,
D13110,
15 PP., 2006
doi:10.1029/2005JD006511
Evaluation of fraction of absorbed photosynthetically active radiation products for different canopy radiation transfer regimes: Methodology and results using Joint Research Center products derived from SeaWiFS against ground-based estimations
Global Environmental Monitoring Unit, Institute for Environment and Sustainability, European Commission Joint Research Centre, Ispra, Italy
Global Environmental Monitoring Unit, Institute for Environment and Sustainability, European Commission Joint Research Centre, Ispra, Italy
Global Environmental Monitoring Unit, Institute for Environment and Sustainability, European Commission Joint Research Centre, Ispra, Italy
Department of Geography and Program in Planning, University of Toronto, Toronto, Ontario, Canada
USDA Forest Service, Corvallis, Oregon, USA
Institute of Geography, University of Copenhagen, Copenhagen, Denmark
Forest Department, Centre de Coopération Internationale en Recherche Agronomique pour le Développement, Cayenne, French Guyana
NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
Global Environmental Monitoring Unit, Institute for Environment and Sustainability, European Commission Joint Research Centre, Ispra, Italy
Global Environmental Monitoring Unit, Institute for Environment and Sustainability, European Commission Joint Research Centre, Ispra, Italy
NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
Institute of Geography, University of Copenhagen, Copenhagen, Denmark
Global Environmental Monitoring Unit, Institute for Environment and Sustainability, European Commission Joint Research Centre, Ispra, Italy
Department of Forest Science, Oregon State University, Corvallis, Oregon, USA
Global Environmental Monitoring Unit, Institute for Environment and Sustainability, European Commission Joint Research Centre, Ispra, Italy
Global Environmental Monitoring Unit, Institute for Environment and Sustainability, European Commission Joint Research Centre, Ispra, Italy
This paper discusses the quality and the accuracy of the Joint Research Center (JRC) fraction of absorbed photosynthetically active radiation (FAPAR) products generated from an analysis of Sea-viewing Wide Field-of-view Sensor (SeaWiFS) data. The FAPAR value acts as an indicator of the presence and state of the vegetation and it can be estimated from remote sensing measurements using a physically based approach. The quality of the SeaWiFS FAPAR products assessed in this paper capitalizes on the availability of a 6-year FAPAR time series over the full globe. This evaluation exercise is performed in two phases involving, first, an analysis of the verisimilitude of the FAPAR products under documented environmental conditions and, second, a direct comparison of the FAPAR values with ground-based estimations where and when the latter are available. This second phase is conducted following a careful analysis of problems arising for performing such a comparison. This results in the grouping of available field information into broad categories representing different radiative transfer regimes. This strategy greatly helps the interpretation of the results since it recognizes the various levels of difficulty and sources of uncertainty associated with the radiative sampling of different types of vegetation canopies.
Received 18 July 2005; accepted 30 March 2006; published 15 July 2006.
Citation: (2006), Evaluation of fraction of absorbed photosynthetically active radiation products for different canopy radiation transfer regimes: Methodology and results using Joint Research Center products derived from SeaWiFS against ground-based estimations, J. Geophys. Res., 111, D13110, doi:10.1029/2005JD006511.
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