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Characterisation methods for the hyperspectral sensor HySpex at DLR’s calibration home base

Baumgartner, Andreas and Gege, Peter and Köhler, Claas and Lenhard, Karim and Schwarzmaier, Thomas (2012) Characterisation methods for the hyperspectral sensor HySpex at DLR’s calibration home base. SPIE Remote Sensing 2012, 24.-27. Sep. 2012, Edinburgh, Großbritannien.

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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.

Document Type:Conference or Workshop Item (Speech)
Title:Characterisation methods for the hyperspectral sensor HySpex at DLR’s calibration home base
Authors:
AuthorsInstitution or Email of Authors
Baumgartner, Andreasandreas.baumgartner@dlr.de
Gege, Peter peter.gege@dlr.de
Köhler, Claasclaas.koehler@dlr.de
Lenhard, Karimkarim.lenhard@dlr.de
Schwarzmaier, Thomasthomas.schwarzmaier@dlr.de
Date:September 2012
Refereed publication:No
In ISI Web of Science:No
Page Range:pp. 1-8
Status:Published
Keywords:Hyperspectral, Imaging Spectrometer, Smile, Keystone, Calibration, Radiometry, LSF, SRF
Event Title:SPIE Remote Sensing 2012
Event Location:Edinburgh, Großbritannien
Event Type:international Conference
Event Dates:24.-27. Sep. 2012
Organizer:SPIE
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Optische Sensorik - Theorie, Kalibration
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Experimental Methods
Deposited By: Andreas Baumgartner
Deposited On:20 Nov 2012 07:40
Last Modified:01 Mar 2013 15:43

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