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Local range estimation in wild animals

Over the past decade global positioning systems and communications technologies have come together in the design of devices attached to animals that allow us to monitor at regular intervals of time (as fine as a fraction of a minute apart) the location of an animal to within the precision of a few meters. A new class of computational methods have been developed to construct distributions of where such monitored organisms are most likely to be found in space and time using this data, and are much more accurate than previous methods when dealing with large sets of data. Previous methods, called Kernel Methods, were based on associating a parametric distribution, such as a Normal distribution, with each location point. The new methods, referred to as LoCoH (local convex hull) methods, are essentially non-parametric kernel methods where the kernel associated with each data point is constructed directly from that point and a given number of its nearest neighbors. These methods have application to all types of ecological and biological resource management problems, but will prove especially useful in evaluating the spatial needs of threatened species and designing parks to conserve them.


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Contact: Wayne Getz
getz@nature.berkeley.edu
Public Library of Science
13-Feb-2007


Page: 1

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