Coral Reefs

, Volume 35, Issue 3, pp 889–894 | Cite as

End of the chain? Rugosity and fine-scale bathymetry from existing underwater digital imagery using structure-from-motion (SfM) technology

  • Curt D. Storlazzi
  • Peter Dartnell
  • Gerald A. Hatcher
  • Ann E. Gibbs
Note

Abstract

The rugosity or complexity of the seafloor has been shown to be an important ecological parameter for fish, algae, and corals. Historically, rugosity has been measured either using simple and subjective manual methods such as ‘chain-and-tape’ or complicated and expensive geophysical methods. Here, we demonstrate the application of structure-from-motion (SfM) photogrammetry to generate high-resolution, three-dimensional bathymetric models of a fringing reef from existing underwater video collected to characterize the seafloor. SfM techniques are capable of achieving spatial resolution that can be orders of magnitude greater than large-scale lidar and sonar mapping of coral reef ecosystems. The resulting data provide finer-scale measurements of bathymetry and rugosity that are more applicable to ecological studies of coral reefs than provided by the more expensive and time-consuming geophysical methods. Utilizing SfM techniques for characterizing the benthic habitat proved to be more effective and quantitatively powerful than conventional methods and thus might portend the end of the ‘chain-and-tape’ method for measuring benthic complexity.

Keywords

Rugosity Bathymetry Imagery Structure-from-motion (SfM) 

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Copyright information

© US Government 2016

Authors and Affiliations

  • Curt D. Storlazzi
    • 1
  • Peter Dartnell
    • 1
  • Gerald A. Hatcher
    • 1
  • Ann E. Gibbs
    • 1
  1. 1.US Geological SurveyPacific Coastal and Marine Science CenterSanta CruzUSA

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