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  • 1
    Electronic Resource
    Electronic Resource
    The transport of amino acids, amino acid derivatives and ions across ion-exchange membranes
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Biomembranes 860 (1986), S. 484-490 
    Details
    ISSN: 0005-2736
    Keywords: Amino acid transport ; Ion transport ; Ion-exchange membrane ; Polystyrene
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0005-2736(86)90545-6
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    Paper (German National Licenses)
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  • 2
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    Status of the Imaging Spectroscopy Mission EnMAP with Radiometric Calibration and Correction (2020)
    In:  ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
    Details
    Publication Date: 2021-02-03
    Description: The high-resolution imaging spectroscopy remote sensing mission EnMAP (Environmental Mapping and Analysis Program, enmap.org) covers the spectral range from 420 nm to 2450 nm with a spectral sampling distance varying between 4.8 nm and 12.0 nm comprising 262 spectral bands. We focus on the planned framework concerning radiometry. The expected signal-to-noise ratio at reference radiance level is 500:1 at 495 nm and 150:1 at 2200 nm. The radiometric resolution is 14 bits and an absolute radiometric accuracy of better than 5% is achieved. Radiometric calibration is based on Sun calibration measurements with a fullaperture diffusor for absolute calibration. In addition, relative calibration monitors the instrument during the complete mission lifetime based on an integrating sphere (on the satellite). The fully-automatic on-ground image processing chain considers the derived radiometric calibration coefficients in the radiometric correction which is followed by the orthorectification and atmospheric compensation. Each of the two 2-dimensional detector arrays of the prism-based pushbroom dual-spectrometer works in a dual-gain configuration to cover the complete dynamic range. EnMAP will acquire 30 km in the across-track direction with a ground sampling distance of 30 m and the across-track tilt capability of 30° will enable a target revisit time of less than 4 days. The launch is scheduled for 2021. The high-quality products will be freely available to international scientific users for measuring and analysing diagnostic parameters which describe vital processes on the Earth’s surface
    Language: English
    Type: info:eu-repo/semantics/article
    Format: application/pdf
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  • 3
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    The EnMAP imaging spectroscopy mission towards operations (2023)
    In:  Remote Sensing of Environment
    Details
    Publication Date: 2023-12-18
    Description: EnMAP (Environmental Mapping and Analysis Program) is a high-resolution imaging spectroscopy remote sensing mission that was successfully launched on April 1st, 2022. Equipped with a prism-based dual-spectrometer, EnMAP performs observations in the spectral range between 418.2 nm and 2445.5 nm with 224 bands and a high radiometric and spectral accuracy and stability. EnMAP products, with a ground instantaneous field-of-view of 30 m x 30 m at a swath width of 30 km, allow for the qualitative and quantitative analysis of surface variables from frequently and consistently acquired observations on a global scale. This article presents the EnMAP mission and details the activities and results of the Launch and Early Orbit and Commissioning Phases until November 1st, 2022. The mission capabilities and expected performances for the operational Routine Phase are provided for existing and future EnMAP users.
    Type: info:eu-repo/semantics/article
    Format: application/pdf
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  • 4
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    Calibration and Validation of the Hyperspectral Mission EnMAP: Results of The Commissioning Phase (2023)
    In:  Proceedings
    Details
    Publication Date: 2024-05-10
    Description: Spaceborne imaging spectroscopy is undergoing a rapid expansion with a new generation of missions in recent years. Following the Hyperion (2000) and HICO (2009) missions, new spaceborne imaging spectroscopy missions have recently started operating: DESIS (2018), PRISMA (2019), HISUI (2019) and more recently EnMAP (2022) and EMIT (2022). These missions face the common challenge of providing accurate spectral and radiometric results over a wide spectral range. This requires accurate instrument calibration and the validation of the results obtained. In this contribution, we provide an overview of the calibration and validation (CalVal) activities in the EnMAP mission, and we present the CalVal results that were obtained as part of the commissioning phase (April - October 2022).
    Type: info:eu-repo/semantics/conferenceObject
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