Description Usage Arguments Details Value References See Also Examples
The function dynppa
computes the (dynamic) PPA measure of the accessibility space of an animal.
The PPA method can be thought as an alternative view on the home range; one that explicitly considers the
spatial and temporal constraints on movement given known telemetry fixes, and a (dynamic) measure of maximum
mobility - termed Vmax. The PPA method incorporates dynamic behaviour into the calculation of the vmax parameter
used to delineate the original version of the PPA method, but the original method is still an option here.
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traj |
an object of the class |
tol |
parameter used to filter out those segments where the time between fixes is overly
large (often due to irregular sampling or missing fixes); which leads to an overestimation of the
activity space via the PPA method. Default is the maximum sampling interval from |
dissolve |
(logical) whether or not to dissolve output elliplse polygons to create a single output polygon, or keep the individual segment PPA ellipses. Default = TRUE. |
proj4string |
a string object containing the projection information to be passed included in the output
|
ePoints |
number of vertices used to construct each PPA ellipse. More points will necessarily provide a more detailed ellipse shape, but will slow computation; default is 360. |
... |
additional parameters to be passed to the function |
The function dyn.ppa
represents an extension to an existing PPA method (Long and Nelson, 2012).
Dynamic calculation of the PPA method improves upon the original version by flexibly modelling the vmax
parameter according to wildlife behaviour. See the function dyn.vmax
for more information on how
to incorporate dynamic behaviour into the vmax parameter estimation.
This function returns a SpatialPolygonsDataFrame
representing the dynamic PPA measure of the accessibility
space of an individual animal.
Long, JA, Nelson, TA. (2012) Time geography and wildlife home range delineation. Journal of Wildlife
Management, 76(2):407-413.
Long, JA, Nelson, TA. (2014) Home range and habitat analysis using dynamic time geography. Journal of
Wildlife Management. Accepted: 2014-12-03.
dynvmax
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