Abstract

Background We are increasingly using recording devices with multiple sensors operating at high frequencies to produce large volumes of data which are problematic to interpret. A particularly challenging example comes from studies on animals and humans where researchers use animal-attached accelerometers on moving subjects to attempt to quantify behaviour, energy expenditure and condition. Results The approach taken effectively concatinated three complex lines of acceleration into one visualization that highlighted patterns that were otherwise not obvious. The summation of data points within sphere facets and presentation into histograms on the sphere surface effectively dealt with data occlusion. Further frequency binning of data within facets and representation of these bins as discs on spines radiating from the sphere allowed patterns in dynamic body accelerations (DBA) associated with different postures to become obvious. Method We examine the extent to which novel, gravity-based spherical plots can produce revealing visualizations to incorporate the complexity of such multidimensional acceleration data using a suite of different acceleration-derived metrics with a view to highlighting patterns that are not obvious using current approaches. The basis for the visualisation involved three-dimensional plots of the smoothed acceleration values, which then occupied points on the surface of a sphere. This sphere was divided into facets and point density within each facet expressed as a histogram. Within each facet-dependent histogram, data were also grouped into frequency bins of any desirable parameters, most particularly dynamic body acceleration (DBA), which were then presented as discs on a central spine radiating from the facet. Greater radial distances from the sphere surface indicated greater DBA values while greater disc diameter indicated larger numbers of data points with that particular value. Conclusions We indicate how this approach links behaviour and proxies for energetics and can inform our identification and understanding of movement-related processes, highlighting subtle differences in movement and its associated energetics. This approach has ramifications that should expand to areas as disparate as disease identification, lifestyle, sports practice and wild animal ecology.

Related Files

Open Access Link

DOI

10.1186/s40462-016-0088-3
https://dx.doi.org/10.1186/s40462-016-0088-3

Citation

BibTeX

@Article{Wilson2016,
author="Wilson, Rory P.
and Holton, Mark D.
and Walker, James S.
and Shepard, Emily L. C.
and Scantlebury, D. Mike
and Wilson, Vianney L.
and Wilson, Gwendoline I.
and Tysse, Brenda
and Gravenor, Mike
and Ciancio, Javier
and McNarry, Melitta A.
and Mackintosh, Kelly A.
and Qasem, Lama
and Rosell, Frank
and Graf, Patricia M.
and Quintana, Flavio
and Gomez-Laich, Agustina
and Sala, Juan-Emilio
and Mulvenna, Christina C.
and Marks, Nicola J.
and Jones, Mark W.",
title="A spherical-plot solution to linking acceleration metrics with animal performance, state, behaviour and lifestyle",
journal="Movement Ecology",
year="2016",
volume="4",
number="1",
pages="1--11",
abstract="We are increasingly using recording devices with multiple sensors operating at high frequencies to produce large volumes of data which are problematic to interpret. A particularly challenging example comes from studies on animals and humans where researchers use animal-attached accelerometers on moving subjects to attempt to quantify behaviour, energy expenditure and condition.",
issn="2051-3933",
doi="10.1186/s40462-016-0088-3",
url="http://dx.doi.org/10.1186/s40462-016-0088-3"
}