Vicarious calibration of airborne hyperspectral sensors in operational environments

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Authors
  1. Secker, J.
  2. Staenz, K.
  3. Gauthier, R.P.
  4. Budkewitsch, P.
Corporate Authors
Defence Research Establishment Ottawa, Ottawa ONT (CAN)
Abstract
A reflectance-based vicarious calibration (RBVC) method has been used to correct the radiometric coefficients for hyperspectral data obtained with the Probe 1 sensor ovewr the Raglan region of northern Quebec, and to perform a radiance renormalisation for compact airborne spectrographic imager (casi) data obtained over Goose Bay, Labrador. It relies on the simultaneous acquisition of ground-based reflectance spectra for at least one calibration site within the hyperspectral flight time. The RBVC method yields a new set of radiometric coefficients that convert the hyperspectral data from digital numbers (DNs) to radiances, and that are applicable to flight lines taken under different conditions. For both the Raglan and the Goose Bay projects, the calibration site was a gravel airstrip, and ground-based reflectance measurements were made with a GER3700 field spectrometer using a Spectralon panel for reference. This represents a novel use of the RBVC method for validation and correction of the sensor's radiometric calibration at the tim eof data acquisition, applied in a operational setting that lacks a large, brighter and homogeneous calibration target and well-characterized atmospheric conditions. Analysis fo the errors involved in correcting the radiometric coefficients yielded a total relative errors (averaged over wavelength) of 3.9-5.6% on the final reflectance spectra.
Keywords
Hyperspectral;Atmospheric correction;casi;Probe 1;GER3700;Field spectrometer;Hyperspectral data;Vicarious calibration
Date of publication
01 Sep 2001
Number of Pages
14
Reprinted from
Remote Sensing of Environments, vol 76, 2001, p 81-92
DSTKIM No
CA011795
CANDIS No
516321
Format(s):
Hardcopy;Document Image stored on Optical Disk

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