DWEL: A Dual-Wavelength Echidna Lidar for ground-based forest scanning

Ewan S. Douglas, Alan Strahler, Jason Martel, Timothy Cook, Christopher Mendillo, Robert Marshall, Supriya Chakrabarti, Crystal Schaaf, Curtis Woodcock, Zhan Li, Xiaoyuan Yang, Darius Culvenor, David Jupp, Glenn Newnham, Jenny Lovell

Research output: Contribution to conferencePaperpeer-review

49 Scopus citations


The Dual-Wavelength Echidna® Lidar (DWEL), a ground-based, full-waveform lidar scanner designed for automated retrieval of forest structure, uses simultaneously-pulsing, 1064 nm and 1548 nm lasers to separate scattering by leaves from scattering by trunks, branches, and ground materials. Leaf hits are separated from others by a reduced response at 1548 nm due to water absorption by leaf cellular contents. By digitizing the full return-pulse waveform (full-width half maximum, 1.5 m) at 7.5 cm intervals, the scanner can identify the type of scattering event, as well as identify and separate multiple scattering events along the pulse path to reconstruct multiple hits at distances of up to 100 m from the scanner. Scanning covers zenith angles of 0-119° and 360 azimuth with pulse centers spaced at 4, 2, and 1 mrad intervals, providing spatial resolutions of 4-40, 2-20, and 1-10 cm respectively at 10 and 100 m distances. The instrument is currently undergoing integration and testing for field deployment in July-August, 2012.

Original languageEnglish (US)
Number of pages4
StatePublished - 2012
Externally publishedYes
Event2012 32nd IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2012 - Munich, Germany
Duration: Jul 22 2012Jul 27 2012


Conference2012 32nd IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2012


  • Forestry
  • Laser radar
  • Vegetation

ASJC Scopus subject areas

  • Computer Science Applications
  • General Earth and Planetary Sciences


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