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Proceedings Paper

Characterisation methods for the hyperspectral sensor HySpex at DLR's calibration home base
Author(s): Andreas Baumgartner; Peter Gege; Claas Köhler; Karim Lenhard; Thomas Schwarzmaier
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Paper Abstract

The German Aerospace Center’s (DLR) Remote Sensing Technology Institute (IMF) operates a laboratory for the characterisation of imaging spectrometers. Originally designed as Calibration Home Base (CHB) for the imaging spectrometer APEX, the laboratory can be used to characterise nearly every airborne hyperspectral system. Characterisation methods will be demonstrated exemplarily with HySpex, an airborne imaging spectrometer system from Norsk Elektro Optikks A/S (NEO). Consisting of two separate devices (VNIR-1600 and SWIR-320me) the setup covers the spectral range from 400 nm to 2500 nm. Both airborne sensors have been characterised at NEO. This includes measurement of spectral and spatial resolution and misregistration, polarisation sensitivity, signal to noise ratios and the radiometric response. The same parameters have been examined at the CHB and were used to validate the NEO measurements. Additionally, the line spread functions (LSF) in across and along track direction and the spectral response functions (SRF) for certain detector pixels were measured. The high degree of lab automation allows the determination of the SRFs and LSFs for a large amount of sampling points. Despite this, the measurement of these functions for every detector element would be too time-consuming as typical detectors have 105 elements. But with enough sampling points it is possible to interpolate the attributes of the remaining pixels. The knowledge of these properties for every detector element allows the quantification of spectral and spatial misregistration (smile and keystone) and a better calibration of airborne data. Further laboratory measurements are used to validate the models for the spectral and spatial properties of the imaging spectrometers. Compared to the future German spaceborne hyperspectral Imager EnMAP, the HySpex sensors have the same or higher spectral and spatial resolution. Therefore, airborne data will be used to prepare for and validate the spaceborne system’s data.

Paper Details

Date Published: 19 November 2012
PDF: 8 pages
Proc. SPIE 8533, Sensors, Systems, and Next-Generation Satellites XVI, 85331H (19 November 2012); doi: 10.1117/12.974664
Show Author Affiliations
Andreas Baumgartner, Deutsches Zentrum für Luft- und Raumfahrt e.V. (Germany)
Peter Gege, Deutsches Zentrum für Luft- und Raumfahrt e.V. (Germany)
Claas Köhler, Deutsches Zentrum für Luft- und Raumfahrt e.V. (Germany)
Karim Lenhard, Deutsches Zentrum für Luft- und Raumfahrt e.V. (Germany)
Thomas Schwarzmaier, Deutsches Zentrum für Luft- und Raumfahrt e.V. (Germany)

Published in SPIE Proceedings Vol. 8533:
Sensors, Systems, and Next-Generation Satellites XVI
Roland Meynart; Steven P. Neeck; Haruhisa Shimoda, Editor(s)

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