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Stacked space-time densities: a geovisualisation approach to explore dynamics of space use over time

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Abstract

Recent developments and ubiquitous use of global positioning devices have revolutionised movement ecology. Scientists are able to collect increasingly larger movement datasets at increasingly smaller spatial and temporal resolutions. These data consist of trajectories in space and time, represented as time series of measured locations for each tagged animal. Such data are analysed and visualised using methods for estimation of home range or utilisation distribution, which are often based on 2D kernel density in geographic space. These methods have been developed for much sparser and smaller datasets obtained through very high frequency (VHF) radio telemetry. They focus on the spatial distribution of measurement locations and ignore time and sequentiality of measurements. We present an alternative geovisualisation method for spatio-temporal aggregation of trajectories of tagged animals: stacked space-time densities. The method was developed to visually portray temporal changes in animal use of space using a volumetric display in a space-time cube. We describe the algorithm for calculation of stacked densities using four different decay functions, normally used in space use studies: linear decay, bisquare decay, Gaussian decay and Brownian decay. We present a case study, where we visualise trajectories of lesser black backed gulls, collected over 30 days. We demonstrate how the method can be used to evaluate temporal site fidelity of each bird through identification of two different temporal movement patterns in the stacked density volume: spatio-temporal hot spots and spatial-only hot spots.

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Notes

  1. Note that [26, 27] present the formula with a square root in the denominator, which corresponds to a 1D (not 2D, as required) Gaussian distribution. Their derivations are not affected by this.

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Acknowledgments

Research presented in this paper is part of the collaboration under the COST (European Cooperation in Science and Technology) ICT Action IC0903, “Knowledge Discovery from Moving Objects (MOVE)” and facilitated by the Lorentz Center workshop on “Analysis and visualization of moving objects” (http://www.lorentzcenter.nl/lc/web/2011/453/info.php3?wsid=453). We thank Kees Camphuysen (NIOZ) and Arnold Gronert for all the field work and sharing expert knowledge related to the Lesser black backed gull project. The tracking infrastructure is facilitated by the BiG Grid infrastructure for eScience (www.biggrid.nl). The authors would like to thank Dr Jed Long and Dr Iain Dillingham from the Centre for Geoinformatics, University of St Andrews, for useful discussions in preparation of revisions of this paper.

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Authors and Affiliations

  1. Centre for GeoInformatics, School of Geography & Geosciences, University of St Andrews, Irvine Building, North Street, St Andrews, Fife, Scotland, KY16 9AL, UK

    Urška Demšar

  2. Department of Mathematics and Computer Science, Technical University Eindhoven, Eindhoven, The Netherlands

    Kevin Buchin

  3. Computational Geo-Ecology, Institute of Biodiversity and Ecosystem Dynamics (IBED), University of Amsterdam, Amsterdam, The Netherlands

    E. Emiel van Loon & Judy Shamoun-Baranes

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  1. Urška Demšar
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  4. Judy Shamoun-Baranes
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Correspondence to Urška Demšar.

Appendix—algorithm for calculation of stacked space-time densities

Appendix—algorithm for calculation of stacked space-time densities

This appendix presents the pseudo code of our algorithm.

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Demšar, U., Buchin, K., van Loon, E.E. et al. Stacked space-time densities: a geovisualisation approach to explore dynamics of space use over time. Geoinformatica 19, 85–115 (2015). https://doi.org/10.1007/s10707-014-0207-5

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