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• W1965633708 startingPage "4154" @default.
• W1965633708 abstract "Field spectroradiometers integrated in automated systems at Eddy Covariance (EC) sites are a powerful tool for monitoring and upscaling vegetation physiology and carbon and water fluxes. However, exposure to varying environmental conditions can affect the functioning of these sensors, especially if these cannot be completely insulated and stabilized. This can cause inaccuracy in the spectral measurements and hinder the comparison between data acquired at different sites. This paper describes the characterization of key sensor models in a double beam spectroradiometer necessary to calculate the Hemispherical-Conical Reflectance Factor (HCRF). Dark current, temperature dependence, non-linearity, spectral calibration and cosine receptor directional responses are modeled in the laboratory as a function of temperature, instrument settings, radiation measured or illumination angle. These models are used to correct the spectral measurements acquired continuously by the same instrument integrated outdoors in an automated system (AMSPEC-MED). Results suggest that part of the instrumental issues cancel out mutually or can be controlled by the instrument configuration, so that changes induced in HCFR reached about 0.05 at maximum. However, these corrections are necessary to ensure the inter-comparison of data with other ground or remote sensors and to discriminate instrumentally induced changes in HCRF from those related with vegetation physiology and directional effects." @default.
• W1965633708 created "2016-06-24" @default.
• W1965633708 creator A5013863721 @default.
• W1965633708 creator A5046706112 @default.
• W1965633708 date "2015-02-11" @default.
• W1965633708 modified "2023-09-23" @default.
• W1965633708 title "Characterization of a Field Spectroradiometer for Unattended Vegetation Monitoring. Key Sensor Models and Impacts on Reflectance" @default.
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• W1965633708 doi "https://doi.org/10.3390/s150204154" @default.
• W1965633708 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4367403" @default.
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