A model-based approach to correcting spectral irradiance data using an upward-looking airborne sensor (CASI ILS)


Choi, Kyu-Young and Milton, E.J. (2001) A model-based approach to correcting spectral irradiance data using an upward-looking airborne sensor (CASI ILS). In, RSPS2001: Geomatics, Earth Observation and the Information Society. 1st Annual Meeting of the Remote Sensing and Photogrammetry Society. RSPS2001: Geomatics, Earth Observation and the Information Society 1st Annual Meeting of the Remote Sensing and Photogrammetry Society Nottingham, UK, Remote Sensing and Photogrammetry Society, 64-75.

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Description/Abstract

A number of aircraft sensors have the facility to measure spectral downwelling irradiance using a sensor mounted on the roof of the aircraft, but these data are rarely used for atmospheric correction. Part of the problem is that the attitude of the airborne platform is always changing during flight, even in stable conditions, so that direct use of data from an incident light sensor (ILS) can introduce errors into atmospheric correction methods. The continual motion of the ILS is used here to advantage, as a means to fit a sky radiance distribution model developed by Brunger and Hooper (1993) to data from the Itres Instruments CASI ILS. The inclination of the ILS sensor, due to changing aircraft attitude, is considered as
the slope plane in the model. The selected model coefficients correspond to parameterised atmospheric conditions and represent atmospheric transmission and the proportion of direct:diffuse flux. The method was used to correct CASI ILS data acquired over a site in southern England. Comparison with spectral irradiance measured simultaneously on the ground shows that the method reduced the variability of the ILS data and also compensated for the effect of different flight directions. The sky radiance distribution at sensor level is also calculated by
the model, and shows the characteristics of the sky conditions at the time of each flight.

Item Type: Book Section
Additional Information: CD ROM
Subjects: G Geography. Anthropology. Recreation > G Geography (General)
Divisions: University Structure - Pre August 2011 > School of Geography > Remote Sensing and Spatial Analysis
ePrint ID: 5040
Date Deposited: 21 May 2004
Last Modified: 27 Mar 2014 18:00
Publisher: Remote Sensing and Photogrammetry Society
URI: http://eprints.soton.ac.uk/id/eprint/5040

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