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Cause effect and correction of field spectroradiometer inter-channel radiometric steps.

Hueni, A*; Bialek, A (2017) Cause effect and correction of field spectroradiometer inter-channel radiometric steps. IEEE J. Sel. Top. Appl. Earth Observ. Remote Sens., 10 (4). pp. 1542-1551.

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Abstract

Field spectroradiometers often comprise several spectral detectors to sample the full range of reflected solar irradiance. An example of such an instrument is the Analytical Spectral Devices (ASD) full range spectroradiometer, featuring three spectral channels to capture spectra between 350 nm and 2500 nm. The resulting spectra often exhibit radiometric steps at the joints of these channels. This study investigates the influence of external temperature and humidity on the magnitude of these steps by experiments based on a climate chamber. The derived sensor model provides a physically based explanation of the changes in radiometry due to temperature and demonstrates that all spectral bands are affected to a higher or lesser degree. The model can be used to correct for the effect of temperature on the recorded radiances. Applying the model to ASD instruments that were not tested in the climate chamber still leads to reasonable correction results with RMSE values of 0.6%.

Item Type: Article
Keywords: Sensor Model, Temperature Dependency, Radiometry, Fieldspectroscopy
Subjects: Optical Radiation and Photonics
Optical Radiation and Photonics > Environment and Climate Change
Divisions: Chemical, Medical & Environmental Science
Identification number/DOI: 10.1109/JSTARS.2016.2625043
Last Modified: 09 Feb 2018 14:16
URI: http://eprintspublications.npl.co.uk/id/eprint/7549

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