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Buchhorn, Marcel; Petereit, Reinhold; Heim, Birgit (2013): The ManTIS Field Spectro-Goniometer Movie - Presentation of the Instrument and Measurement Scheme. PANGAEA,, Supplement to: Buchhorn, M et al. (2013): A Manual Transportable Instrument Platform for Ground-Based Spectro-Directional Observations (ManTIS) and the Resultant Hyperspectral Field Goniometer System. Sensors, 13(12), 16105-16128,

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This article presents and technically describes a new field spectro-goniometer system for the ground-based characterization of the surface reflectance anisotropy under natural illumination conditions developed at the Alfred Wegener Institute (AWI). The spectro-goniometer consists of a Manual Transportable Instrument platform for ground-based Spectro-directional observations (ManTIS), and a hyperspectral sensor system. The presented measurement strategy shows that the AWI ManTIS field spectro-goniometer can deliver high quality hemispherical conical reflectance factor (HCRF) measurements with a pointing accuracy of ±6 cm within the constant observation center. The sampling of a ManTIS hemisphere (up to 30° viewing zenith, 360° viewing azimuth) needs approx. 18 min. The developed data processing chain in combination with the software used for the semi-automatic control provides a reliable method to reduce temporal effects during the measurements. The presented visualization and analysis approaches of the HCRF data of an Arctic low growing vegetation showcase prove the high quality of spectro-goniometer measurements. The patented low-cost and lightweight ManTIS instrument platform can be customized for various research needs and is available for purchase.
This video shows HCRF measurements with the ManTIS Field Spectro-Goniometer in the Arctic.
Acknowledgments: The platform and resultant ManTIS field spectro-goniometer system development would not have been possible without the know-how, private engagement, and financial support of various people and institutions. We want to thank the scientific workshop of the Alfred Wegener Institute (AWI) in Bremerhaven for their generous technical support, and the GFZ German Research Centre for Geosciences for their financial support. We are indebted to doppler H. Würflingsdobler GmbH, Germany, the Spectra Vista Corporation, USA, the AnKoTec Anton Kothe company, Germany, and the OVA Oberflächenveredelung in Adlershof GmbH, Germany, by providing us free building material or invoicing at cost price. We want individual acknowledge Theres Küster (GFZ) for her help during the development of the Python scripts for the visualization of the HCRF measurements. The main author also wants to personally thank co-author Reinhold Petereit (AWI) for his know-how and dedication during the ManTIS construction phase.
This work is part of the AWI "hy-ARK-VEG" project sponsored by the German Research Center for Aeronautics and Space (DLR) and funded by the German Federal Ministry of Economics and Technology [support code: 50 EE 1013] in preparation of the hyperspectral EnMAP space mission. Finally, we want to thank the Helmholtz Graduate School for Polar and Marine Research (POLMAR) and Potsdam Graduate School (PoGS) for funding a research stay at the Alaska Geobotany Center (AGC), University of Alaska Fairbanks (UAF) in Fairbanks.
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