Estimating spectral irradiance from measurements in seven spectral bands


Rollin, E.M. and Milton, E.J. (2003) Estimating spectral irradiance from measurements in seven spectral bands. In, Aplin, P. and Mather, P.M. (eds.) Proceedings of the RSPSoc 2003 : Scales and dynamics in observing the environment, University of Nottingham, 10-12 Sep 2003. Nottingham, UK, Remote Sensing and Photogrammetry Society, 10pp.

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Description/Abstract

Accurate measurement and characterisation of fluctuations in the irradiance environment is important for many areas of optical remote sensing. This paper reports a method of estimating spectral irradiance over the VNIR region (400 - 1100nm) from the radiance of a calibrated reference panel, measured in seven narrow (10nm) spectral bands. Earlier work established the potential for estimating spectral irradiance from multi-band data using a neural network technique (Milton et al., 2000). The approach described here uses linear regression analysis to regenerate the irradiance spectrum from data in seven reference wavelengths. The method was tested using data from a specially designed multiband radiometer – the INdependent SPectral IRradiance Estimator (INSPIRE). The irradiance spectrum was partitioned into a number of distinct regions within each of which the spectral
irradiance was estimated from irradiance measured at one of the reference wavelengths. The precision of the method was found to be better than ±5% over most wavelengths from 400nm to 1100nm. Furthermore, the slope coefficients of the individual regression models were found to be sensitive to the sky radiance conditions, especially over the region 600-760nm, and improvement in the precision of the predicted spectrum (to within ±3%) was obtained by taking the diffuse-to-global (D:G) irradiance ratio at the time of measurement into account.

Item Type: Book Section
Subjects: G Geography. Anthropology. Recreation > GA Mathematical geography. Cartography
Divisions: University Structure - Pre August 2011 > School of Geography > Remote Sensing and Spatial Analysis
ePrint ID: 6177
Date Deposited: 12 Jun 2004
Last Modified: 27 Mar 2014 18:00
Publisher: Remote Sensing and Photogrammetry Society
URI: http://eprints.soton.ac.uk/id/eprint/6177

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