On the Reproducibility of Reflectance Factors: Implications for EO Science

Karen Anderson1, E. J. Milton2, Vincent Odongo2 and Jennifer L. Dungan3
1.School of Geography, University of Exeter, UK
2.School of Geography, University of Southampton, UK
3.NASA Ames Research Center, Moffett Field, CA, USA
1.karen.anderson@exeter.ac.uk; 2. milton@soton.ac.uk; 3.Jennifer.L.Dungan@nasa.gov

Abstract: Measurements of reflectance quantities collected in natural radiation conditions underpin quantitative Earth observation (EO) science through calibration, validation and atmospheric correction techniques. Despite their importance to the longevity of EO data, only a few studies have commented on the reliability of such measurements. This paper will report on results from three experiments. Each was designed to explore a different facet of measurement uncertainty in field measurements of hemispherical conical reflectance factors(HCRF), and to consider the broader implications of this for EO. From an end-user's standpoint we will describe a simple methodology for standard uncertainty characterisation for any reflectance-measurement scenario. The work provides a broad basis for considering standardised approaches to uncertainty characterisation and reporting, which is a necessary step towards improving the reproducibility and traceability of EO data and associated products.

Keywords: reflectance, uncertainty, spectroradiometer, HCRF

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