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Journal of Applied Remote Sensing

Capabilities and performance of dual-wavelength Echidna® lidar
Author(s): Glenn A. Howe; Kuravi Hewawasam; Ewan S. Douglas; Jason Martel; Zhan Li; Alan Strahler; Crystal Schaaf; Timothy A. Cook; Supriya Chakrabarti
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Paper Abstract

We describe the capabilities and performance of a terrestrial laser scanning instrument built for the purpose of recording and retrieving the three-dimensional structure of forest vegetation. The dual-wavelength Echidna® lidar characterizes the forest structure at an angular resolution as fine as 1 mrad while distinguishing between leaves and trunks by exploiting their differential reflectances at two wavelengths: 1 and 1.5 μm. The instrument records the full waveforms of return signals from 5 ns laser pulses at half-nanosecond time resolution; obtains ±117 deg zenith and 360 deg azimuth coverage out to a radius of more than 70 m; provides single-target range resolution of 4.8 and 2.3 cm for the 1 and 1.5 μm channels, respectively (1σ); and separates adjacent pulse returns in the same waveform at a distance of 52.0 and 63.8 cm apart for the 1 and 1.5 μm channels, respectively. The angular resolution is in part controlled by user-selectable divergence optics and is shown to be <2 mrad for the instrument’s standard resolution mode, while the signal-to-noise ratio is 10 at 70 m range for targets with leaf-like reflectance for both channels. The portability and target differentiation make the instrument an ideal ground-based lidar suited for vegetation sensing.

Paper Details

Date Published: 17 December 2015
PDF: 12 pages
J. Appl. Remote Sens. 9(1) 095979 doi: 10.1117/1.JRS.9.095979
Published in: Journal of Applied Remote Sensing Volume 9, Issue 1
Show Author Affiliations
Glenn A. Howe, Univ. of Massachusetts Lowell (United States)
Kuravi Hewawasam, Univ. of Massachusetts Lowell (United States)
Ewan S. Douglas, Boston Univ. (United States)
Jason Martel, Univ. of Massachusetts Lowell (United States)
Zhan Li, Univ. of Massachusetts Boston (United States)
Alan Strahler, Boston Univ. (United States)
Crystal Schaaf, Univ. of Massachusetts Boston (United States)
Timothy A. Cook, Univ. of Massachusetts Lowell (United States)
Supriya Chakrabarti, Univ. of Massachusetts Lowell (United States)


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