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Potential path volume (PPV): a geometric estimator for space use in 3D.

Urška Demšar1, Jed A Long1,2

  • 11School of Geography & Sustainable Development, University of St Andrews, Irvine Building, North Street, Scotland, St Andrews KY16 9AL UK.

Movement Ecology
|June 6, 2019
PubMed
Summary

This study introduces the Potential Path Volume (PPV), a new 3D method for analyzing animal space use. The PPV accounts for vertical movement, improving accuracy in ecological studies.

Keywords:
3DAnimal movementMovement analyticsSpace useTime geographyVolumetric visualisation

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Area of Science:

  • Movement ecology
  • Spatial analysis
  • Animal behavior

Background:

  • Many animals exhibit 3D movement, yet tracking studies often neglect the vertical dimension.
  • Ignoring vertical space use can lead to inaccuracies in quantifying spatial differentiation, inter-individual interactions, and resource utilization.

Purpose of the Study:

  • To introduce a novel geometric estimator for quantifying three-dimensional (3D) animal space use.
  • To address the limitations of existing methods that do not fully incorporate vertical movement data.

Main Methods:

  • Development of the Potential Path Volume (PPV) estimator, a 3D generalization of the Potential Path Area (PPA).
  • Mathematical derivation and algorithmic implementation of the PPV for calculation.
  • Application of the PPV to 3D bird tracking data.

Main Results:

  • Demonstrated PPV application using 3D bird tracking data.
  • Analyzed PPV size in relation to trip type (departure/return foraging trips) and temporal sampling resolution.
  • Observed that PPV size increases with temporal resolution; contrary to expectations, return PPVs were not consistently smaller than departure PPVs.
  • Addressed differential vertical and horizontal movement speeds by rescaling the PPV.

Conclusions:

  • The Potential Path Volume (PPV) offers a new analytical tool for movement ecology in 3D.
  • The PPV method has potential for broad application in various ecological and movement analysis contexts.