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A new index for measuring perpendicularity of animal movements in relation to patch boundaries

Author

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  • Aho, Ken A.
  • Long, Ryan A.
  • Kie, John G.
  • Bowyer, R. Terry

Abstract

We introduce a new index for measuring perpendicularity of animal movements with respect to a boundary (e.g., a habitat patch edge), and provide a computer algorithm for its calculation. Our index, η, improves on an approach that measures perpendicularity with respect to a fixed boundary direction. This is because η accounts for moment-to-moment trajectories relative to nearest-neighbor boundary attributes at the scale of an animal's movement. Our algorithm prp calculates η efficiently and accurately with both synthetic data and large telemetry datasets. In addition, we have included routines in prp which account for scenarios inherently problematic to perpendicularity estimators.

Suggested Citation

  • Aho, Ken A. & Long, Ryan A. & Kie, John G. & Bowyer, R. Terry, 2010. "A new index for measuring perpendicularity of animal movements in relation to patch boundaries," Ecological Modelling, Elsevier, vol. 221(17), pages 2003-2007.
    • Handle: RePEc:eee:ecomod:v:221:y:2010:i:17:p:2003-2007
    DOI: 10.1016/j.ecolmodel.2010.06.006
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