Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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    Records 1 - 12 / 12

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    Assessing satellite-derived land product quality for earth system science applications: results from the ceos lpv sub-group
    Nightingale, J. ; Schaepman-Strub, G. ; Nickeson, J. ; Baret, F. ; Herold, M. - \ 2010
    The value of satellite derived land products for science applications and research is dependent upon the known accuracy of the data. CEOS (Committee on Earth Observation Satellites), the space arm of the Group on Earth Observations (GEO), plays a key role in coordinating the land product validation process. The Land Product Validation (LPV) sub-group of the CEOS Working Group on Calibration and Validation (WGCV) aims to address the challenges associated with the validation of global land products. This paper provides an overview of LPV sub-group focus area activities, which cover seven terrestrial Essential Climate Variables (ECVs). The contribution will enhance coordination of the scientific needs of the Earth system communities with global LPV activities.
    Retrieving crop specific green area index from remote sensing data when the spatial resolution is close to the target field size
    Duveiller, G. ; Weiss, M. ; Baret, F. ; Wit, A.J.W. de; Defourny, P. - \ 2010
    PROSPECT and SAIL models: a review of use for vegetation characterization
    Jacquemond, S. ; Verhoef, W. ; Baret, F. ; Bacour, C. ; Zarco-Tejada, P. ; Asner, G.P. ; Francois, C. ; Ustin, S.L. - \ 2009
    Remote Sensing of Environment 113 (2009)Suppl 1. - ISSN 0034-4257 - p. S56 - S66.
    radiative-transfer models - remote-sensing data - leaf optical-properties - canopy reflectance models - cyclopes global products - sugar-beet canopies - chlorophyll content - water-content - area index - bidirectional reflectance
    The combined PROSPECT leaf optical properties model and SAIL canopy bidirectional reflectance model, also referred to as PROSAIL, has been used for about sixteen years to study plant canopy spectral and directional reflectance in the solar domain. PROSAIL has also been used to develop new methods for retrieval of vegetation biophysical properties. It links the spectral variation of canopy reflectance, which is mainly related to leaf biochemical contents, with its directional variation, which is primarily related to canopy architecture and soil/vegetation contrast. This link is key to simultaneous estimation of canopy biophysical/structural variables for applications in agriculture, plant physiology, or ecology, at different scales. PROSAIL has become one of the most popular radiative transfer tools due to its ease of use, general robustness, and consistent validation by lab/field/space experiments over the years. However, PROSPECT and SAIL are still evolving: they have undergone recent improvements both at the leaf and the plant levels. This paper provides an extensive review of the PROSAIL developments in the context of canopy biophysics and radiative transfer modeling
    Retrieving canopy variables by radiative transfer model inversion : an automated regional approach for imaging spectrometer data
    Dorigo, W. ; Baret, F. ; Richter, R. ; Ruecker, G. ; Schaepman, M.E. ; Mueller, A. - \ 2007
    In: Proceedings 5th EARSeL SIG IS workshop "IMAGING SPECTROSCOPY: innovation in environmental research". - Brugge : EARSeL - p. 16 - 16.
    Understanding vegetation response to climate variability from space: recent advances towards the SPECTRA mission
    Menenti, M. ; Rast, M. ; Baret, F. ; Hurk, B. van den; Knorr, W. ; Mauser, W. ; Miller, J. ; Moreno, J. ; Schaepman, M.E. ; Verstraete, M. - \ 2005
    Rivista Italiana di Telerilevamento 33/34 (2005). - ISSN 1129-8596 - p. 193 - 206.
    Measurements of the rate of increase of atmospheric CO2 and calculations of the global CO2 budgets imply that a large fraction of emissions is being absorbed in terrestrial carbon pools and that current estimates put the biosphere sink at roughly about half the emissions. The SPECTRA mission addresses these issues by providing detailed observations to help understanding the terrestrial component of the carbon cycle. Scientific preparations for SPECTRA are pursued along two avenues: a) the nature of the expected data and candidate algorithms are evaluated by generating and using synthetic hyper-spectral multi-angular radiometric data; b) algorithms are evaluated with actual hyper-spectral data colelcted with a variety of airborne systems and concurrent ground measurements
    Understanding vegetation response to climate variability from space with hyper-spectral, multi-angular observations
    Menenti, M. ; Rast, M. ; Bach, H. ; Baret, F. ; Hurk, B. van den; Jia, L. ; Li, Z.L. ; Knorr, W. ; Probeck, M. ; Mauser, W. ; Miller, J. ; Moreno, J. ; Schaepman, M.E. ; Verhoef, W. ; Verstraete, M. - \ 2005
    In: 9th International Symposium on Physical Measurements and Signatures in Remote Sensing (ISPMSRS), Beijing, 17-19 October 2005. - Beijing : ISPRS WG VII/1 - p. 72 - 75.
    Many vegetation properties are related to features of reflectance spectra in the region 400 nm - 2500 nm. and to emittance in region 8 mm - 14 mm Detailed observations of spectral reflectance reveal subtle features related to biochemical components of leaves such as chlorophyll and water. Exchange of energy between the biosphere and the atmosphere is an important mechanism determining the response of vegetation to climate variability. This requires measurements of the component temperature of foliage and soil. The latter are closely related to the angular variation in thermal infrared emittance. The architecture of vegetation canopies determines complex changes of observed reflectance and emittance spectra with view and illumination angle. Quantitative analysis of reflectance and emittance spectra requires, therefore, an accurate characterization of the anisotropy of radiance. This can be achieved with nearly - simultaneous observations at different view angles. The Surface Processes and Ecosystem Changes Through Response Analysis (SPECTRA) Mission has been conceived to perform these observations at high spatial resolution by taking advantage of the spacecraft agility. Scientific preparations are pursued along two avenues: a) the nature of the expected data and candidate algorithms are evaluated by generating and using synthetic hyper - spectral multi - angular/radiometric data; b) algorithms are evaluated with actual hyper - spectral data collected with a variety of airborne systems and concurrent ground measurements; Campaigns have been performed using radiometric observations provided by ATSR, AATSR, AirMISR, CHRIS - PROBA and a variety of airborne hyperspectral systems. The paper will cover highlights of these studies.
    SPECTRA - Surface Processes and Ecosystem Changes Through Response Analysis
    Menenti, M. ; Fuchs, J. ; Rast, M. ; Baret, F. ; Hurk, B. van den; Knorr, W. ; Mauser, W. ; Miller, J.R. ; Moreno, J.F. ; Schaepman, M.E. ; Verstraete, M.M. - \ 2004
    In: Proceedings Earth Explorers User Consultation Meeting, Frascati, 2004 Frascati, Italy : ESA - p. 1 - 48.
    Understanding vegetation response to climate variability from space: Recent advances towards the SPECTRA mission
    Menenti, M. ; Rast, M. ; Baret, F. ; Hurk, B. van den; Knorr, W. ; Mauser, W. ; Miller, J.R. ; Moreno, J.F. ; Schaepman, M.E. ; Verstraete, M.M. - \ 2004
    In: Eos. Trans. AGU, 85(17), Joint Assembly Suppl. Abstract GC53A-05 Montreal : - p. GC53A - 05.
    SPECTRA - Surface Processes and Ecosystem Changes Through Response Analysis
    Rast, M. ; Baret, F. ; Hurk, B. van den; Knorr, W. ; Mauser, W. ; Menenti, M. ; Miller, J. ; Moreno, J. ; Schaepman, M.E. ; Verstraete, M. - \ 2004
    Noordwijk : ESA Publications Division (ESA SP 1279(2)) - 66 p.
    Understanding vegetation response to climate variability from space: recent advances towards the SPECTRA Mission
    Menenti, M. ; Rast, M. ; Baret, F. ; Hurk, B. van den; Knorr, W. ; Mauser, W. ; Miller, J. ; Moreno, J. ; Schaepman, M.E. ; Verstraete, M.M. - \ 2004
    In: Proceedings of SPIE: Sensors, Systems, and Next-Generation Satellites VII. - - p. 76 - 85.
    Concept for Future Visible and Infrared Imager
    Münzenmeyer, R. ; Reinert, T. ; Pasternak, F. ; Posselt, W. ; Holata, W. ; Holata, K. ; Maurer, R. ; Schaepman, M.E. ; Baret, F. ; Feijt, A. ; Jolivet, D. ; Robinson, I. ; Robertson, C. ; Houseago Stokes, R. ; Lleweling Jones, D. - \ 2003
    Toulouse : Astrium GmbH - 224 p.
    Understanding Vegetation Response to Climate Variability from Space: Recent Advances Towards the SPECTRA Mission
    Menenti, M. ; Rast, M. ; Baret, F. ; Hurk, B. van den; Knorr, W. ; Mauser, W. ; Miller, J. ; Moreno, J. ; Schaepman, M.E. ; Verstraete, M. - \ 2003
    In: Geophysical Research Abstracts EGU - p. 03234 - 03234.
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