Description Usage Arguments Details Value References See Also
Calculate the utilization distribution of an animal based on randomised shortest paths between fixes.
1 |
traj |
animal movement trajectory in the form of an |
r |
a |
theta |
a global value for theta. |
theta.col |
character string of the name of the column containing values of theta for each segment (only used if theta is not provided). |
timescale |
(logical) whether or not to scale each segment so the sum of the output surface is equal to the duration of the segment (in seconds). Default = FALSE. |
A randomised shortest path model is fit between every pair of fixes. The randomised shortest path model is derived from the passage
function in the package gdistance
. It uses the net number of packages (see ?passage
) to estimate the probability and then scales the values appropriately. An input rasterLayer
object is required which defines the ability for movement through the landscape, which might typically be derived from a resource selection function, or be related to known barriers on the landscape. It requires only a single parameter theta
which can be estimated from the data using the function esttheta
.
This function returns a RasterLayer
which can be used to estimate the UD of an animal.
Long, J.A. Estimating wildlife utilization distributions using randomized shortest paths. (in Preparation)
esttheta, volras
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