Terrestrial laser scan error in the presence of dense ground vegetation

Seamus Coveney, Stewart Fotheringham

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Terrestrial laser scanning (TLS) data-sets are seeing increasing use in geology, geomorphology, forestry and urban mapping. The ease of use, affordability and operational flexibility of TLS suggest that demand for it is likely to increase in large-scale mapping studies. However, its advantages may remain restricted to specific environments, because of difficulties in defining bare-ground level in the presence of ground-level vegetation. This paper seeks to clarify the component contributions to TLS elevation error deriving from vegetation occlusion, scan co-registration error, point cloud georeferencing error and target position definition in TLS point cloud data. A multi-scan single-returns TLS point cloud data-set of very high resolution (∼250points/m2) was acquired for an 11 hectare area of open, substantially flat and 100% vegetated coastal saltmarsh, providing data for the empirical quantification of TLS error. Errors deriving from the sources discussed are quantified, clarifying the potential proportional contribution of vegetation to other error sources. Initial data validation is applied to the TLS point cloud data after application of a local-lowest-point selection process, and repeat validation tests are applied to the resulting filtered point cloud after application of a kriging-based error adjustment and data fusion with GPS. The final results highlight the problem of representing bare ground effectively within TLS data captured in the presence of dense ground vegetation and clarify the component contributions of elevation error deriving from surveying and data processing.

Original languageEnglish (US)
Pages (from-to)307-324
Number of pages18
JournalPhotogrammetric Record
Volume26
Issue number135
DOIs
StatePublished - Sep 2011
Externally publishedYes

Fingerprint

laser
Scanning
Lasers
vegetation
Geomorphology
Forestry
Surveying
Data fusion
Geology
kriging
saltmarsh
surveying
geomorphology
Global positioning system
forestry
GPS
geology

Keywords

  • Bare-ground height
  • Error due to ground-level vegetation
  • GPS data fusion
  • Point cloud georeferencing
  • Saltmarsh
  • Terrestrial laser scanning

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)
  • Computers in Earth Sciences
  • Computer Science Applications
  • Engineering (miscellaneous)

Cite this

Terrestrial laser scan error in the presence of dense ground vegetation. / Coveney, Seamus; Fotheringham, Stewart.

In: Photogrammetric Record, Vol. 26, No. 135, 09.2011, p. 307-324.

Research output: Contribution to journalArticle

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