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Proceedings Paper

Effects of nonuniform spectral sampling in hyperspectral sensors
Author(s): Bruno Aiazzi; Alessandro Barducci; Stefano Baronti; Annalisa Capanni; Umberto Del Bello; Paolo Marcoionni; Ivan Pippi; Leonardo Santurri; Raffaele Vitulli
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Paper Abstract

This paper focuses on the 'spectral' aliasing phenomenon that may produce distortions on remotely sensed spectra acquired by hyper-spectral push-broom sensors and that arises because of an inadequate sampling rate. The analysis of the aliasing appearance has been performed on a set of at-sensor radiance spectra computed stemming from some spectral libraries with spectral resolution sufficiently high for our aims. A general procedure to evaluate aliasing in spectral remote sensing data has been proposed. A model for the system modulation transfer function of a hyper-spectral push-broom sensor (like PRISM) has been developed by taking into account the different contributions due to optics, electronics, detector, spectrometer dispersion. By using this sensor model, the set of high resolution spectra has been processed in order to obtain the related set of simulated acquired spectra; also a corresponding set of not aliased spectra has been produced. Several score indexes have been considered among those proposed in literature and the three most effective have been implemented and applied to evaluate the aliasing produced in the acquired data. Aliasing evaluation has been first performed onto the simulated spectra without atmospheric and radiometric correction. Afterwards 'ideal' correction based on the knowledge of the ground irradiance and the atmospheric transmittance spectrum has been implemented, hence the aliasing evaluation has been performed also onto the reconstructed set of spectra (atmospherically and radiometrically corrected). Results are presented in the paper. To remove the constraints of the 'ideal correction', a simple atmospheric correction model has been implemented and applied to the simulated spectra radiometrically corrected; a qualitative evaluation of the reconstructed spectra has been performed.

Paper Details

Date Published: 8 April 2003
PDF: 12 pages
Proc. SPIE 4881, Sensors, Systems, and Next-Generation Satellites VI, (8 April 2003); doi: 10.1117/12.462989
Show Author Affiliations
Bruno Aiazzi, Istituto di Fisica Applicata Nello Carrara-CNR (Italy)
Alessandro Barducci, Istituto di Fisica Applicata Nello Carrara-CNR (Italy)
Stefano Baronti, Istituto di Fisica Applicata Nello Carrara-CNR (Italy)
Annalisa Capanni, Galileo Avionica (Italy)
Umberto Del Bello, European Space Agency/ESTEC (Netherlands)
Paolo Marcoionni, Istituto di Fisica Applicata Nello Carrara-CNR (Italy)
Ivan Pippi, Istituto di Fisica Applicata Nello Carrara-CNR (Italy)
Leonardo Santurri, Istituto di Fisica Applicata Nello Carrara-CNR (Italy)
Raffaele Vitulli, European Space Agency/ESTEC (Netherlands)


Published in SPIE Proceedings Vol. 4881:
Sensors, Systems, and Next-Generation Satellites VI
Hiroyuki Fujisada; Joan B. Lurie; Michelle L. Aten; Konradin Weber; Joan B. Lurie; Michelle L. Aten; Konradin Weber, Editor(s)

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