Remote Sensing Applications and Decision Support

Capabilities and performance of dual-wavelength Echidna® lidar

[+] Author Affiliations
Glenn A. Howe, Kuravi Hewawasam, Jason Martel, Timothy A. Cook, Supriya Chakrabarti

UMass Lowell, Experimental Center for Environmental LIDAR, Department of Physics, Lowell, Massachusetts 01854, United States

Ewan S. Douglas

Boston University, Department of Astronomy, Boston, Massachusetts 02215, United States

Zhan Li, Crystal Schaaf

UMass Boston, School for the Environment, College of Science and Mathematics, Boston, Massachusetts 02215, United States

Alan Strahler

Boston University, Department of Earth and Environment, Boston, Massachusetts 02125, United States

J. Appl. Remote Sens. 9(1), 095979 (Dec 17, 2015). doi:10.1117/1.JRS.9.095979
History: Received July 13, 2015; Accepted November 18, 2015
Text Size: A A A

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.

Figures in this Article
© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Glenn A. Howe ; Kuravi Hewawasam ; Ewan S. Douglas ; Jason Martel ; Zhan Li, et al.
"Capabilities and performance of dual-wavelength Echidna® lidar", J. Appl. Remote Sens. 9(1), 095979 (Dec 17, 2015). ; http://dx.doi.org/10.1117/1.JRS.9.095979


Access This Article
Sign in or Create a personal account to Buy this article ($20 for members, $25 for non-members).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging & repositioning the boxes below.

Related Book Chapters

Topic Collections

Advertisement
  • Don't have an account?
  • Subscribe to the SPIE Digital Library
  • Create a FREE account to sign up for Digital Library content alerts and gain access to institutional subscriptions remotely.
Access This Article
Sign in or Create a personal account to Buy this article ($20 for members, $25 for non-members).
Access This Proceeding
Sign in or Create a personal account to Buy this article ($15 for members, $18 for non-members).
Access This Chapter

Access to SPIE eBooks is limited to subscribing institutions and is not available as part of a personal subscription. Print or electronic versions of individual SPIE books may be purchased via SPIE.org.