The temporal dynamics of calibration target reflectance
The temporal dynamics of calibration target reflectance
A field experiment investigated the hypothesis that the nadir reflectance of calibration surface substrates (asphalt and concrete) remains stable over a range of time-scales. Measurable differences in spectral reflectance factors were found over periods as short as 30 minutes. Surface reflectance factors measured using a dual-field-of-view GER1500 spectroradiometer system showed a relationship with
the relative proportion of diffuse irradiance, over periods when solar zenith changes were minimal. Reflectance measurements were collected over precise points on the calibration surfaces using a novel mobile spectroradiometer device, and uncertainty in terms of absolute reflectance was calculated as being < 0.05% within the usable range of the instrument (400-1000nm). Multi-date reflectance factors were compared using one-way ANOVA and found to differ significantly (p = 0.001). These findings illustrate the anisotropic nature of calibration surfaces, and place emphasis on the need to minimise the temporal delay in collection of field spectral measurements for vicarious calibration or empirical atmospheric correction purposes.
Anderson, K.
ef4598bc-7bac-4a63-8d41-ec30d6cfd2b6
Milton, E.J.
f6cb5c0d-a5d4-47d7-860f-096de08e0c24
Rollin, E.M.
32665285-7f95-40a4-9775-7a9b2958f758
September 2003
Anderson, K.
ef4598bc-7bac-4a63-8d41-ec30d6cfd2b6
Milton, E.J.
f6cb5c0d-a5d4-47d7-860f-096de08e0c24
Rollin, E.M.
32665285-7f95-40a4-9775-7a9b2958f758
Anderson, K., Milton, E.J. and Rollin, E.M.
(2003)
The temporal dynamics of calibration target reflectance.
Scales and Dynamics in Observing the Environment, Nottingham, UK.
10 - 12 Sep 2003.
14 pp
.
Record type:
Conference or Workshop Item
(Paper)
Abstract
A field experiment investigated the hypothesis that the nadir reflectance of calibration surface substrates (asphalt and concrete) remains stable over a range of time-scales. Measurable differences in spectral reflectance factors were found over periods as short as 30 minutes. Surface reflectance factors measured using a dual-field-of-view GER1500 spectroradiometer system showed a relationship with
the relative proportion of diffuse irradiance, over periods when solar zenith changes were minimal. Reflectance measurements were collected over precise points on the calibration surfaces using a novel mobile spectroradiometer device, and uncertainty in terms of absolute reflectance was calculated as being < 0.05% within the usable range of the instrument (400-1000nm). Multi-date reflectance factors were compared using one-way ANOVA and found to differ significantly (p = 0.001). These findings illustrate the anisotropic nature of calibration surfaces, and place emphasis on the need to minimise the temporal delay in collection of field spectral measurements for vicarious calibration or empirical atmospheric correction purposes.
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Published date: September 2003
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CD-ROM
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Scales and Dynamics in Observing the Environment, Nottingham, UK, 2003-09-10 - 2003-09-12
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Local EPrints ID: 5012
URI: http://eprints.soton.ac.uk/id/eprint/5012
PURE UUID: 53eed058-e2d0-4f5c-8b29-f880512f191e
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Date deposited: 21 May 2004
Last modified: 15 Mar 2024 04:46
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Contributors
Author:
K. Anderson
Author:
E.M. Rollin
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