LiDAR, UAV or compass-clinometer? Accuracy, coverage and the effects on structural models

A J Cawood, Clare E. Bond, John A. Howell, Robert W.H. Butler, Yukitsugu Totake

Research output: Contribution to journalArticle

53 Citations (Scopus)
78 Downloads (Pure)

Abstract

Abstract Light Detection and Ranging (LiDAR) and Structure from Motion (SfM) provide large amounts of digital data from which virtual outcrops can be created. The accuracy of these surface reconstructions is critical for quantitative structural analysis. Assessment of LiDAR and SfM methodologies suggest that SfM results are comparable to high data-density LiDAR on individual surfaces. The effect of chosen acquisition technique on the full outcrop and the efficacy on its virtual form for quantitative structural analysis and prediction beyond single bedding surfaces, however, is less certain. Here, we compare the accuracy of digital virtual outcrop analysis with traditional field data, for structural measurements and along-strike prediction of fold geometry from Stackpole syncline. In this case, the SfM virtual outcrop, derived from UAV imagery, yields better along-strike predictions and a more reliable geological model, in spite of lower accuracy surface reconstructions than LiDAR. This outcome is attributed to greater coverage by UAV and reliable reconstruction of a greater number of bedding planes than terrestrial LiDAR, which suffers from the effects of occlusion. Irrespective of the chosen acquisition technique, we find that workflows must incorporate careful survey planning, data processing and quality checking of derived data if virtual outcrops are to be used for robust structural analysis and along-strike prediction.
Original languageEnglish
Pages (from-to)67-82
Number of pages16
JournalJournal of Structural Geology
Volume98
Early online date20 Apr 2017
DOIs
Publication statusPublished - May 2017

Keywords

  • LiDAR
  • Structure from motion
  • UAV
  • Virtual outcrop
  • Structural model

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