Andre Hollstein

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This study reports the calibration and validation activities for the Environmental Mapping and Analysis Program (EnMAP; EnMAP is a German imaging spectroscopy satellite mission with the declared goal to investigate the Earth’s surface with a so far surpassing quality. The key scientific questions to which EnMAP will contribute are related to(More)
We optimize a general class of complete multispectral polarimeters with respect to signal-to-noise ratio, stability against alignment errors, and the minimization of errors regarding a given set of polarization states. The class of polarimeters that are dealt with consists of at least four polarization optics each with a multispectral detector. A(More)
A robust method for the optical characterization of polarimeter optics for a complete, multispectral polarimeter is presented. The polarimeter optics consists of a waveplate, a polarizing filter, and a multispectral detector. The method employs a source of unpolarized light and a rotating polarizing filter and retrieves the retardance and the angle of the(More)
The Aliso Canyon gas storage facility near Porter Ranch, California, produced a large accidental CH4 release from October 2015 to February 2016. The Hyperion imaging spectrometer on board the EO-1 satellite successfully detected this event, achieving the first orbital attribution of CH4 to a single anthropogenic superemitter. Hyperion measured shortwave(More)
Aerosol particles have an important impact on the surface net radiation budget by direct scattering and absorption (direct aerosol effect) of solar radiation, and also by influencing cloud formation processes (semi-direct and indirect aerosol effects). To study the former, a multispectral multiangle spectrometer system for flexible use on moving platforms(More)
The effects of polarization, sea water salinity, and temperature on top of atmosphere radiances and water leaving radiances (WLRs) are discussed using radiative transfer simulations for MEdium resolution imaging spectrometer (MERIS) channels from 412 to 900 nm. A coupled system of an aerosol-free atmosphere and an ocean bulk containing chlorophyll and(More)
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