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Characterisation of the apparent reflectance of a concrete calibration surface over different time scales

Characterisation of the apparent reflectance of a concrete calibration surface over different time scales
Characterisation of the apparent reflectance of a concrete calibration surface over different time scales
This paper describes results from a detailed field spectral measurement campaign, designed to assess the temporal stability of calibration surface reflectance factors. The results have wider implications for those using field measurements of reflectance in stand-alone studies, or in a calibration/validation context. A dual-field-of-view VNIR spectroradiometer system measured temporal changes in nadir surface reflectance factors at a concrete calibration surface. Reflectance factor variations were assessed in relation to the solar zenith angle (SZA), using the modified Walthall et al. (1985) model. Superimposed on low-magnitude variations in surface reflectance factors with SZA, were larger differences caused by environmental effects. Seasonal changes were caused by activation of a vegetative bloom which caused surface reflectance factors to vary by up to 16% (670nm). A smaller amount of variation was associated with changes in total solar radiation (kWm-2). This was an ‘apparent’ effect, caused by the directional anisotropy of the surface response, in relation to changing distributions of irradiance. A quantitative surface response model was derived empirically, and successfully used to predict concrete surface reflectance factors. The results highlight fundamental differences between inherent and apparent reflectance, and demonstrate that the reflectance factor response of a weathered concrete calibration surface was predictable over a range of timescales.
Institute of Geographic Sciences and Natural Resources Research, CAS
Anderson, Karen
449e3b00-71c6-43c6-8404-867ffc68cc05
Milton, E.J.
c447d4a7-b6ee-4782-a205-f240e3f5488b
Anderson, Karen
449e3b00-71c6-43c6-8404-867ffc68cc05
Milton, E.J.
c447d4a7-b6ee-4782-a205-f240e3f5488b

Anderson, Karen and Milton, E.J. (2005) Characterisation of the apparent reflectance of a concrete calibration surface over different time scales. In Proceedings of the 9th International Symposium on Physical Measurements and Signatures in Remote Sensing (ISPMSRS). Institute of Geographic Sciences and Natural Resources Research, CAS..

Record type: Conference or Workshop Item (Paper)

Abstract

This paper describes results from a detailed field spectral measurement campaign, designed to assess the temporal stability of calibration surface reflectance factors. The results have wider implications for those using field measurements of reflectance in stand-alone studies, or in a calibration/validation context. A dual-field-of-view VNIR spectroradiometer system measured temporal changes in nadir surface reflectance factors at a concrete calibration surface. Reflectance factor variations were assessed in relation to the solar zenith angle (SZA), using the modified Walthall et al. (1985) model. Superimposed on low-magnitude variations in surface reflectance factors with SZA, were larger differences caused by environmental effects. Seasonal changes were caused by activation of a vegetative bloom which caused surface reflectance factors to vary by up to 16% (670nm). A smaller amount of variation was associated with changes in total solar radiation (kWm-2). This was an ‘apparent’ effect, caused by the directional anisotropy of the surface response, in relation to changing distributions of irradiance. A quantitative surface response model was derived empirically, and successfully used to predict concrete surface reflectance factors. The results highlight fundamental differences between inherent and apparent reflectance, and demonstrate that the reflectance factor response of a weathered concrete calibration surface was predictable over a range of timescales.

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More information

Submitted date: 17 October 2005
Venue - Dates: 9th International Symposium on Physical Measurements and Signatures in Remote Sensing (ISPMSRS), 2005-10-17 - 2005-10-19

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Local EPrints ID: 24120
URI: https://eprints.soton.ac.uk/id/eprint/24120
PURE UUID: fef200bb-dff4-49b5-9371-6b1a4638f55e

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Date deposited: 23 Mar 2006
Last modified: 17 Jul 2017 16:14

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Contributors

Author: Karen Anderson
Author: E.J. Milton

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