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Calibration of dual-beam spectroradiometric data

Record type: Article

An experiment to determine the most accurate and repeatable method for generating instrument inter-calibration functions (ICFs) is described, based upon data collected with a dual-beam GER1500 spectroradiometer system. The quality of reflectance data collected using a dual-beam spectroradiometer system is reliant upon accurate inter-calibration of the sensor pairs to take into account differences in their radiant sensitivity and spectral characteristics. A cos-conical field-based method for inter-calibrating dual-beam spectroradiometers was tested alongside laboratory inter-calibration procedures.
The field-based method produced the most accurate results when a field-derived ICF collected close in time was used to correct the spectral scan. A regression model to predict the ICF at a range of wavelengths was tested, using inputs of solar zenith angle, cosine of solar zenith angle and broadband diffuse-to-global irradiance ratios. The linear multiple regression model described up to 78% of the variability in ICF; the remainder of the variability was most likely due to complexities of instrumental behaviour in response to warm-up time, ambient temperature and environmental conditions at the time of measurement. Collection of ICFs using a stable laboratory source was shown to provide unsatisfactory results due to differences between lamp outputs and the field-measured solar spectrum. Consequently, the most practical and accurate method of deriving inter-calibration functions is to use field-derived ICFs, collected close in time and space to the data requiring correction.

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Citation

Anderson, K, Milton, E.J. and Rollin, E.M. (2006) Calibration of dual-beam spectroradiometric data International Journal of Remote Sensing, 27, (5), pp. 975-986. (doi:10.1080/01431160500213375).

More information

Submitted date: 15 July 2004
Published date: 10 March 2006
Keywords: calibration, spectroradiometer, methodology

Identifiers

Local EPrints ID: 28622
URI: http://eprints.soton.ac.uk/id/eprint/28622
ISSN: 0143-1161
PURE UUID: 18fb4ec1-9797-42b3-9884-e5ab3a3164fe

Catalogue record

Date deposited: 03 May 2006
Last modified: 17 Jul 2017 16:00

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Contributors

Author: K Anderson
Author: E.J. Milton
Author: E.M. Rollin

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