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16 results on '"Rascher, Uwe"'

1. SARSense: Analyzing air- and space-borne C- and L-band SAR backscattering signals to changes in soil and plant parameters of crops

Author

Mengen, David, primary, Montzka, Carsten, additional, Jagdhuber, Thomas, additional, Fluhrer, Anke, additional, Brogi, Cosimo, additional, Baum, Stephani, additional, Schuttemeyer, Dirk, additional, Bayat, Bagher, additional, Bogena, Heye, additional, Coccia, Alex, additional, Masalias, Gerard, additional, Trinkel, Verena, additional, Jakobi, Jannis, additional, Jonard, Francois, additional, Ma, Yueling, additional, Mattia, Francesco, additional, Palmisano, Davide, additional, Rascher, Uwe, additional, Satalino, Giuseppe, additional, Schumacher, Maike, additional, Koyama, Christian, additional, Schmidt, Marius, additional, and Vereecken, Harry, additional

Published
2021
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2. Beyond APAR and NPQ: Factors Coupling and Decoupling SIF and GPP Across Scales

Author

Porcar-Castell, Albert, primary, Malenovsky, Zbynek, additional, Magney, Troy, additional, Van Wittenberghe, Shari, additional, Fernandez-Marin, Beatriz, additional, Maignan, Fabienne, additional, Zhang, Yongguang, additional, Maseyk, Kadmiel, additional, Atherton, Jon, additional, Albert, Loren P., additional, Robson, Thomas Matthew, additional, Zhao, Feng, additional, Garcia-Plazaola, Jose-Ignacio, additional, Ensminger, Ingo, additional, Rajewicz, Paulina A., additional, Grebe, Steffen, additional, Tikkanen, Mikko, additional, Kellner, James R., additional, Ihalainen, Janne A., additional, Rascher, Uwe, additional, and Logan, Barry, additional

Published
2021
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5. SARSense: A C- and L-band SAR rehearsal campaign in Germany in preparation for ROSE-L

Author

UCL - SST/ELI/ELIE - Environmental Sciences, Montzka, Carsten, Brogi, Cosimo, Mengen, David, Matveeva, Maria, Baum, Stephani, Schüttemeyer, Dirk, Bayat, Bagher, Bogena, Heye, Coccia, Alex, Masalias, Gérard, Graf, Verena, Jakobi, Jannis, Jonard, François, Ma, Yueling, Mattia, Francesco, Palmisano, Davide, Rascher, Uwe, Satalino, Guiseppe, Jagdhuber, Thomas, Fluhrer, Anke, Schumacher, Maide, Schmidt, Marius, Vereecken, Harry, IEEE International Geoscience and Remote Sensing Symposium (IGARSS), UCL - SST/ELI/ELIE - Environmental Sciences, Montzka, Carsten, Brogi, Cosimo, Mengen, David, Matveeva, Maria, Baum, Stephani, Schüttemeyer, Dirk, Bayat, Bagher, Bogena, Heye, Coccia, Alex, Masalias, Gérard, Graf, Verena, Jakobi, Jannis, Jonard, François, Ma, Yueling, Mattia, Francesco, Palmisano, Davide, Rascher, Uwe, Satalino, Guiseppe, Jagdhuber, Thomas, Fluhrer, Anke, Schumacher, Maide, Schmidt, Marius, Vereecken, Harry, and IEEE International Geoscience and Remote Sensing Symposium (IGARSS)

Abstract

In summer 2019 the SARSense campaign was held in Jülich, Germany, to provide insights into the potentials and specifications of the ESA Copernicus candidate mission ROSE-L (Radar Observation System for Europe). ROSE-L will consist of two satellites that carry a polarimetric L-band SAR. Since the L-band signal can penetrate through many natural materials such as vegetation, dry snow and ice, the mission will provide additional information that cannot be gathered by the Copernicus Sentinel-1 C-band SAR mission. The overall objective of the SARSense 2019 campaign is to analyze the mission design concerning its potential for agricultural monitoring services including target applications such as soil moisture monitoring, irrigation management, crop type discrimination, food security and precision farming. The SARSense in situ measurements of soil moisture, soil temperature, vegetation properties, UAS-based multispectral and thermal mapping, as well as the airborne SAR observations are presented as well as strategies for soil moisture retrieval and first analysis.

Published
2020

6. Sarsense: A C- and L-Band SAR Rehearsal Campaign in Germany in Preparation for ROSE-L

Author

Montzka, Carsten, primary, Brogi, Cosimo, additional, Mengen, David, additional, Matveeva, Maria, additional, Baum, Stephani, additional, Schuttemeyer, Dirk, additional, Bayat, Bagher, additional, Bogena, Heye, additional, Coccia, Alex, additional, Masalias, Gerard, additional, Graf, Verena, additional, Jakobi, Jannis, additional, Jonard, Francois, additional, Ma, Yueling, additional, Mattia, Francesco, additional, Palmisano, Davide, additional, Rascher, Uwe, additional, Satalino, Guiseppe, additional, Jagdhuber, Thomas, additional, Fluhrer, Anke, additional, Schumacher, Maike, additional, Schmidt, Marius, additional, and Vereecken, Harry, additional

Published
2020
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8. Field Phenotyping and an Example of Proximal Sensing of Photosynthesis Under Elevated CO2

Author

Muller, Onno, primary, Keller, Beat, additional, Zimmermann, Lars, additional, Jedmowski, Christoph, additional, Kleist, Einhard, additional, Pingle, Vikas, additional, Acebron, Kelvin, additional, dos Santos, Nicolas Zendonadi, additional, Steier, Angelina, additional, Freiwald, Laura, additional, Munoz-Fernandez, Ines, additional, Wilke, Norman, additional, Kraska, Thorsten, additional, Pieruschka, Roland, additional, Schurr, Uli, additional, and Rascher, Uwe, additional

Published
2018
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9. Quantitative global mapping of terrestrial vegetation photosynthesis: The Fluorescence Explorer (FLEX) mission

Author

Moreno, Jose, primary, Colombo, Roberto, additional, Damm, Alexander, additional, Goulas, Yves, additional, Middleton, Elizabeth, additional, Miglietta, Franco, additional, Mohammed, Gina, additional, Mottus, Matti, additional, North, Peter, additional, Rascher, Uwe, additional, van der Tol, Christiaan, additional, and Drusch, Matthias, additional

Published
2017
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11. The FLuorescence EXplorer Mission Concept—ESA’s Earth Explorer 8.

Author

Drusch, Matthias, Moreno, Jose, Del Bello, Umberto, Franco, Raffaella, Goulas, Yves, Huth, Andreas, Kraft, Stefan, Middleton, Elizabeth M., Miglietta, Franco, Mohammed, Gina, Nedbal, Ladislav, Rascher, Uwe, Schuttemeyer, Dirk, and Verhoef, Wout

Subjects
FLUORESCENCE spectroscopy, CHLOROPHYLL spectra, REMOTE sensing, PHOTOSYNTHESIS
Abstract

In November 2015, the FLuorescence EXplorer (FLEX) was selected as the eighth Earth Explorer mission of the European Space Agency. The tandem mission concept will provide measurements at a spectral and spatial resolution enabling the retrieval and interpretation of the full chlorophyll fluorescence spectrum emitted by the terrestrial vegetation. This paper provides a mission concept overview of the scientific goals, the key objectives related to fluorescence, and the requirements guaranteeing the fitness for purpose of the resulting scientific data set. We present the mission design at the time of selection, i.e., at the end of project phase Phase A/B1, as developed by two independent industrial consortia. The mission concepts both rely on a single payload Fluorescence Imaging Spectrometer, covering the spectral range from 500 to 780 nm. In the oxygen absorption bands, its spectral resolution will be 0.3 nm with a spectral sampling interval of 0.1 nm. The swath width of the spectrometer is 150 km and the spatial resolution will be 300 \times 300~\textm^2 . The satellite will fly in tandem with Sentinel-3 providing different and complementary measurements with a temporal collocation of 6 to 15 s. The FLEX launch is scheduled for 2022. [ABSTRACT FROM AUTHOR]

Published
2017
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15. A Method for Uncertainty Assessment of Passive Sun-Induced Chlorophyll Fluorescence Retrieval Using an Infrared Reference Light.

Author

Burkart, Andreas, Schickling, Anke, Mateo, Maria Pilar Cendrero, Wrobel, Thomas Jan, Rossini, Micol, Cogliati, Sergio, Julitta, Tommaso, and Rascher, Uwe

Abstract

Measurements of sun-induced chlorophyll fluorescence (SIF) over plant canopies provide a proxy for plant photosynthetic capacity and are of high interest for plant research. Together with spectral reflectance, SIF has the potential to act as a noninvasive approach to quantify photosynthetic plant traits from field to air and spaceborne scales. However, SIF is a small signal contribution to the reflected sunlight and often not distinguishable from sensor noise. SIF estimation is, therefore, affected by an unquantified uncertainty, making it difficult to estimate accurately how much SIF is truly emitted from the plant. To investigate and overcome this, we designed a device based on a spectrometer covering the visible range and equipped it with an LED emitting at the wavelength of SIF. Using this as a reference and applying thorough calibrations, we present consistent evidence of the instrument’s capability of SIF retrieval and accuracy estimations. The LED’s intensity was measured under sunlight with 1.27 \pm 0.27\textrm mW\times \textrm sr^-1\textm^-2 nm ^-1 stable over the day. The large increase of SIF due to the Kautsky effect was measured spectrally and temporally proving the biophysical origin of the signal. We propose rigorous tests for instruments intended to measure SIF and show ways to further improve the presented methods. [ABSTRACT FROM PUBLISHER]

Published
2015
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16. A Novel UAV-Based Ultra-Light Weight Spectrometer for Field Spectroscopy.

Author

Burkart, Andreas, Cogliati, Sergio, Schickling, Anke, and Rascher, Uwe

Abstract

A novel hyperspectral measurement system for unmanned aerial vehicles (UAVs) in the visible to near infrared (VIS/NIR) range (350-800 nm) was developed based on the Ocean Optics STS microspectrometer. The ultralight device relies on small open source electronics and weighs a ready-to-fly 216 g. The airborne spectrometer is wirelessly synchronized to a second spectrometer on the ground for simultaneous white reference collection. In this paper, the performance of the system is investigated and specific issues such as dark current correction or second order effects are addressed. Full width at half maximum was between 2.4 and 3.0 nm depending on the spectral band. The functional system was tested in flight at a 10-m altitude against a current field spectroscopy gold standard device Analytical Spectral Devices Field Spec 4 over an agricultural site. A highly significant correlation was found in reflection comparing both measurement approaches. Furthermore, the aerial measurements have a six times smaller standard deviation than the hand held measurements. Thus, the present spectrometer opens a possibility for low-cost but high-precision field spectroscopy from UAVs. [ABSTRACT FROM PUBLISHER]

Published
2014
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