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Progress in field spectroscopy.

Milton, E J*; Schaepman, M E*; Anderson, K*; Kneubuhler, M*; Fox, N P (2009) Progress in field spectroscopy. Remote Sens. Environ., 113. S92-S109

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The last twenty years have seen considerable progress in the subject of field spectroscopy. Technical advances in instrumentation have led to spectroradiometers which are, in the main, easy to use and capable of collecting large data sets very quickly. However, the methodology of the subject has not progressed at the same rate, and and considerable variability still exists in the terms and definitions used to describe field spectral measurements. This makes comparison between instruments and between research groups very difficult and may lead to field spectroscopic data being used erroneously, or not at all.
To improve this situation, we propose, first, that a combined geometric-optical and radiometric terminology be adopted. Second, that all field spectroscopic data be expressed in SI units. Third, we propose that field spectral measurements should routinely include data on the spectral and angular distribution of irradiance at the time the measurements are made.
The measurement of all relevant directional information in the field is currently only possible with very few instruments and therefore an unattainable goal, but if field spectroscopy is to fulfil its potential contribution to remote sensing for Earth observation, it is essential that field spectral measurements allow an accurate parameterization of the directionality and finally the BRDF, representing an important conceptual property of the Earth's surface.

Item Type: Article
Keywords: Field spectral measurements, Review, Reflectance, Methodology, BRDF, Goniometer
Subjects: Optical Radiation and Photonics
Optical Radiation and Photonics > Environment and Climate Change
Last Modified: 02 Feb 2018 13:15
URI: http://eprintspublications.npl.co.uk/id/eprint/4471

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