On-ground calibration of DESIS: DLR's Earth sensing imaging spectrometer for the International Space Station (ISS)

Sebastian, Ilse; Krutz, David; Eckardt, Andreas; Venus, Holger; Walter, Ingo; Günther, Burghardt; Neidhardt, Michael; Reulke, Ralf; Müller, Rupert; Uhlig, Mathias; Müller, Sandra; Peschel, Thomas; Arloth, Simone; Lieder, Matthias; Schrandt, Friedrich

doi:10.1117/12.2307188

Cited by 8 publications

(8 citation statements)

References 5 publications

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“…An example mean–variance plot is shown in Figure 16 for part of an image of the Sudan pseudo-invariant site taken on 11 April 2019. The resulting plot was in excellent agreement with the ground-based DESIS measurements [120]. These ground-based measurement’s mean–variance plots predict SNRs>200 for a MODTRAN calculated TOA spectral radiance with a Mid-latitude Summer (MLS) atmosphere, 30% albedo, 45 degree solar elevation, rural aerosol and 23 km visibility.…”

Section: Product Quality and Validationsupporting

confidence: 64%

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Data Products, Quality and Validation of the DLR Earth Sensing Imaging Spectrometer (DESIS)

Alonso¹,

Bachmann

Burch

et al. 2019

Sensors

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119

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Imaging spectrometry from aerial or spaceborne platforms, also known as hyperspectral remote sensing, provides dense sampled and fine structured spectral information for each image pixel, allowing the user to identify and characterize Earth surface materials such as minerals in rocks and soils, vegetation types and stress indicators, and water constituents. The recently launched DLR Earth Sensing Imaging Spectrometer (DESIS) installed on the International Space Station (ISS) closes the long-term gap of sparsely available spaceborne imaging spectrometry data and will be part of the upcoming fleet of such new instruments in orbit. DESIS measures in the spectral range from 400 and 1000 nm with a spectral sampling distance of 2.55 nm and a Full Width Half Maximum (FWHM) of about 3.5 nm. The ground sample distance is 30 m with 1024 pixels across track. In this article, a detailed review is given on the applicability of DESIS data based on the specifics of the instrument, the characteristics of the ISS orbit, and the methods applied to generate products. The various DESIS data products available for users are described with the focus on specific processing steps. The results of the data quality and product validation studies show that top-of-atmosphere radiance, geometrically corrected, and bottom-of-atmosphere reflectance products meet the mission requirements. The limitations of the DESIS data products are also subject to a critical examination.

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Section: Product Quality and Validationsupporting

confidence: 64%

“…The intended use of the on-board calibrations consisting of LEDs for future updates of the radiometric calibration tables will not be possible due to non-uniform illumination of the focal plane array [120]. Therefore, future radiometric re-calibration will only be based on vicarious calibration and cross-calibration activities.…”

Section: Product Limitationsmentioning

confidence: 99%

Data Products, Quality and Validation of the DLR Earth Sensing Imaging Spectrometer (DESIS)

Alonso¹,

Bachmann

Burch

et al. 2019

Sensors

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119

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“…The calibration steps were performed at the system level but also at sub-system level. A dedicated description of calibration results can be found in [22,23]. The following items were characterized: quantum efficiency (QE), linearity, dark signal non-uniformity (DNSU), photo response non-uniformity (PRNU), dark current noisephoton transfer curve (PTC)modulation transfer function (MTF)spectral calibration of the order sorting filterwavefront deformation Peak to Valley (PV) and root-mean-square (RMS) of the optical systemgrating efficiency and 2nd order stray-light suppression by grating subsystempointing accuracy and repeatability of pointing unitfocusing and focus checkspatial MTF and spectral full width at half maximum (FWHM)absolute radiometric calibration for spectral radiancesspectral response function for each pixelkeystone and smilepolarization…”

Section: On-ground Calibration and Testingmentioning

confidence: 99%

The Instrument Design of the DLR Earth Sensing Imaging Spectrometer (DESIS)

Krutz¹,

Müller²,

Knodt

et al. 2019

Sensors

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Whether for identification and characterization of materials or for monitoring of theenvironment, space-based hyperspectral instruments are very useful. Hyperspectral instrumentsmeasure several dozens up to hundreds of spectral bands. These data help to reconstruct the spectralproperties like reflectance or emission of Earth surface or the absorption of the atmosphere, and toidentify constituents on land, water, and in the atmosphere. There are a lot of possible applications,from vegetation and water quality up to greenhouse gas monitoring. But the actual number ofhyperspectral space-based missions or hyperspectral space-based data is limited. This will be changedin the next years by different missions. The German Aerospace Center (DLR) Earth Sensing ImagingSpectrometer (DESIS) is one of the new currently existing space-based hyperspectral instruments,launched in 2018 and ready to reduce the gap of space-born hyperspectral data. The instrument isoperating onboard the International Space Station, using the Multi-User System for Earth Sensing(MUSES) platform. The instrument has 235 spectral bands in the wavelength range from visible(400 nm) to near-infrared (1000 nm), which results in a 2.5 nm spectral sampling distance and aground sampling distance of 30 m from 400 km orbit of the International Space Station. In this article,the design of the instrument will be described.

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“…In summer 2017 the optical system was shipped to DLR for integration into the DESIS instrument. The results of the calibration campaign and the concepts for in-flight calibration were published in [8] , and [9] , respectively.…”

Section: Icso 2018 International Conference On Space Opticsmentioning

confidence: 99%

Integration and testing of an imaging spectrometer for earth observation

Peschel

Beier

Damm

et al. 2019

International Conference on Space Optics — ICSO 2018

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The DLR Earth Sensing Imaging Spectrometer (DESIS) is a space-based hyperspectral instrument developed by Deutsches Zentrum für Luft-und Raumfahrt (DLR). The optical system of the spectrometer was fabricated and prealigned by the Fraunhofer-Institut für Angewandte Optik und Feinmechanik (IOF).The paper describes the manufacturing, integration, and testing of this optical system. It was realized as an all reflective system using metal-based mirrors and a modular, so-called snap-together approach, which allows to simplify the integration of optical systems considerably. Measured r.m.s. wavefront errors of the complete system are in the range of 63 nm to 120 nm, which is compliant with the instrument's requirements.

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On-ground calibration of DESIS: DLR's Earth sensing imaging spectrometer for the International Space Station (ISS)

Cited by 8 publications

References 5 publications

Data Products, Quality and Validation of the DLR Earth Sensing Imaging Spectrometer (DESIS)

Data Products, Quality and Validation of the DLR Earth Sensing Imaging Spectrometer (DESIS)

The Instrument Design of the DLR Earth Sensing Imaging Spectrometer (DESIS)

Integration and testing of an imaging spectrometer for earth observation

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