17 December 2015 Capabilities and performance of dual-wavelength Echidna® lidar
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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.
© 2015 Society of Photo-Optical Instrumentation Engineers (SPIE)
Glenn A. Howe, Glenn A. Howe, Kuravi Hewawasam, Kuravi Hewawasam, Ewan S. Douglas, Ewan S. Douglas, Jason Martel, Jason Martel, Zhan Li, Zhan Li, Alan Strahler, Alan Strahler, Crystal Schaaf, Crystal Schaaf, Timothy A. Cook, Timothy A. Cook, Supriya Chakrabarti, Supriya Chakrabarti, } "Capabilities and performance of dual-wavelength Echidna® lidar," Journal of Applied Remote Sensing 9(1), 095979 (17 December 2015). https://doi.org/10.1117/1.JRS.9.095979 . Submission:
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