نتایج جستجو برای: waveform lidar

تعداد نتایج: 29800  

Journal: :Remote Sensing 2018
Xinglei Zhao Jianhu Zhao Hongmei Zhang Fengnian Zhou

Airborne LiDAR bathymetry (ALB) has been shown to have the ability to retrieve water turbidity using the waveform parameters (i.e., slopes and amplitudes) of volume backscatter returns. However, directly and accurately extracting the parameters of volume backscatter returns from raw green-pulse waveforms in shallow waters is difficult because of the short waveform. This study proposes a new acc...

2009
M. Rentsch

LiDAR systems have been established as technology for fast and high-resolution acquisition of 3D point clouds. In general, LiDAR data acquisition is conducted by private companies who are also responsible for processing and quality control. However, in many cases a subsequent quality assessment of overlapping LiDAR strips still reveals apparent horizontal and vertical offsets which are caused b...

2010
M. Hollaus

Full-waveform LiDAR is an active remote sensing technique that provides the scattering properties of the targets i.e. amplitude and echo width (EW) in addition to 3D point clouds. The amplitude provides information on the target's reflectance and the EW is a measure for the range variation of scatterers within the laser footprint contributing to a single echo and is, therefore, an indicator for...

2010
S. Laky P. Zaletnyik C. Toth

Given sufficient data storage capacity, today’s full-waveform LiDAR systems are able to record and store the entire laser pulse echo signal. This provides the possibility of further analyzing the physical characteristics of the reflecting objects. However the size of the captured data is enormous and currently not practical. Thus arises the need for compressing the waveform data. We have develo...

Journal: :The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences 2012

2008
Clément Mallet Uwe Soergel Frédéric Bretar

In contrast to conventional airborne multi-echo laser scanner systems, full-waveform (FW) lidar systems are able to record the entire emitted and backscattered signal of each laser pulse. Instead of clouds of individual 3D points, FW devices provide connected 1D profiles of the 3D scene, which contain more detailed and additional information about the structure of the illuminated surfaces. This...

Journal: :Mathematical Problems in Engineering 2015

Journal: :Ecology 2010
Scott J Goetz Daniel Steinberg Matthew G Betts Richard T Holmes Patrick J Doran Ralph Dubayah Michelle Hofton

A topic of recurring interest in ecological research is the degree to which vegetation structure influences the distribution and abundance of species. Here we test the applicability of remote sensing, particularly novel use of waveform lidar measurements, for quantifying the habitat heterogeneity of a contiguous northern hardwoods forest in the northeastern United States. We apply these results...

2003
Svetlana Y. Kotchenova Nikolay V. Shabanov Yuri Knyazikhin Anthony B. Davis Ralph Dubayah Ranga B. Myneni

[1] Large footprint waveform-recording laser altimeters (lidars) have demonstrated a potential for accurate remote sensing of forest biomass and structure, important for regional and global climate studies. Currently, radiative transfer analyses of lidar data are based on the simplifying assumption that only single scattering contributes to the return signal, which may lead to errors in the mod...

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