Simulation study on spectral calibration of hyperspectral imagery based on target absorption features

Abstract

Having the advantage of acquiring spatial information and more spectral information, Hyperspectral imager is widely applied in the fields of earth-observation, precision agriculture, etc. In order to improve the quantitative ability of hyperspectral imagery, accurate radiometric and spectral calibrations are necessary. Shifts in channel center wavelengths and changes in spectral resolution may occur when an instrument is transported, fixed, tested before flight, as well as experience vibrations, changes in instrument temperature and pressure on board. As a result, beside laboratory calibration, on-board calibration is necessary for acquiring the detector's actual center wavelengths and spectral resolution. This paper proposes a simulation study on spectral calibration method of hyperspectral imager, whose spectrum covers visible and near-infrared band, using man-made target with spectral absorption feature. The experiment result shows that this method can be applied in on-board spectral calibration to improve the quantitative studies on hyperspectral imagery.