Description Usage Arguments Details Value References See Also
The function ppv
computes the potential path volume (PPV) 3D home range. It is also a measure of the accessibility space of an animal in 3D. The PPV method considers the spatial and temporal constraints on movement given known telemetry fixes, and a (dynamic) measure of maximum mobility - termed Vmax.
1 | ppv(traj, zcol = "z", vmax, vox)
|
traj |
an object of the class |
zcol |
(character string) giving the name of the column in the |
vmax |
either a single vmax value giving the vmax value, or a vector, length n-1, giving the vmax value for each segment. |
vox |
size of voxels in map units (e.g., if x,y,z are in meters then vox should be in meters). |
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 PPV method. Default is the maximum sampling interval from |
The function ppv
represents an extension to an existing 2D home range method (Long and Nelson, 2012) for 3D. ADD MORE HERE.
This function returns a XX representing the ppv 3D home range measure, which can be interpreted as the 3D accessibility space of an individual animal.
Demsar, U, Long, JA (in review) Potential Path Volume (PPV): a geometric estimator for space use in 3D. In review at Movement Ecology.
Long, JA, Nelson, TA. (2012) Time geography and wildlife home range delineation. Journal of Wildlife
Management, 76(2):407-413.
dynvmax dynppa
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