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Extracting Phase and Amplitude Modifications of Laser-Coupled Fano Resonances (2014)

Andreas Kaldun, Christian Ott, Alexander Blättermann, Martin Laux, Kristina Meyer, Thomas Ding, Andreas Fischer, and Thomas Pfeifer

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2014-03-11

Beschreibung: Author(s): Andreas Kaldun, Christian Ott, Alexander Blättermann, Martin Laux, Kristina Meyer, Thomas Ding, Andreas Fischer, and Thomas Pfeifer Fano line shapes observed in absorption spectra encode information on the amplitude and phase of the optical dipole response. A change in the Fano line shape, e.g., by interaction with short-pulsed laser fields, allows us to extract dynamical modifications of the amplitude and phase of the coupled e... [Phys. Rev. Lett. 112, 103001] Published Mon Mar 10, 2014

Schlagwort(e): Atomic, Molecular, and Optical Physics

Print ISSN: 0031-9007

Digitale ISSN: 1079-7114

Thema: Physik

Publiziert von American Physical Society (APS)

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Remote Sensing, Vol. 4, Pages 1494-1518: Application of Semi-Automated Filter to Improve Waveform Lidar Sub-Canopy Elevation Model (2012)

Geoffrey A. Fricker; Sassan S. Saatchi; Victoria Meyer; Thomas W. Gillespie; Yongwei Sheng

MDPI Publishing

In: Remote Sensing

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Publikationsdatum: 2012-05-26

Beschreibung: Modeling sub-canopy elevation is an important step in the processing of waveform lidar data to measure three dimensional forest structure. Here, we present a methodology based on high resolution discrete-return lidar (DRL) to correct the ground elevation derived from large-footprint Laser Vegetation Imaging Sensor (LVIS) and to improve measurement of forest structure. We use data acquired over Barro Colorado Island, Panama by LVIS large-footprint lidar (LFL) in 1998 and DRL in 2009. The study found an average vertical difference of 28.7 cm between 98,040 LVIS last-return points and the discrete-return lidar ground surface across the island. The majority (82.3%) of all LVIS points matched discrete return elevations to 2 m or less. Using a multi-step process, the LVIS last-return data is filtered using an iterative approach, expanding window filter to identify outlier points which are not part of the ground surface, as well as applying vertical corrections based on terrain slope within the individual LVIS footprints. The results of the experiment demonstrate that LFL ground surfaces can be effectively filtered using methods adapted from discrete-return lidar point filtering, reducing the average vertical error by 15 cm and reducing the variance in LVIS last-return data by 70 cm. The filters also reduced the largest vertical estimations caused by sensor saturation in the upper reaches of the forest canopy by 14.35 m, which improve forest canopy structure measurement by increasing accuracy in the sub-canopy digital elevation model.

Digitale ISSN: 2072-4292

Thema: Architektur, Bauingenieurwesen, Vermessung , Geographie

Publiziert von MDPI Publishing

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