On Thu, 15 Mar 2012 10:56:45 -0500
Jaime Burbano Girón jaimeb...@gmail.com wrote:
Hi Louise, I have calculated minimum convex polygons with calc_mcp
function from package aspace, but I think this function is not
longer available, so I attach my script using it, where the function
is written.
Hello,
I have a distribution dataset for species consisting of xy coordinates at
the 1km resolution, with only presence data. So a simplified example of a
species distribution might be:
y - rbind(as.integer(rnorm(100,50,20)), as.integer(rnorm(200,100,30)),
as.integer(rnorm(100,180,15)))
x -
Dear Louise,
I think there is a couple of possibilities. You might be interested in
clusthr, LoCoH.* and CharHull, also in the package adehabitatHR. Please
check the vignette of the package, section 6:
vignette(adehabitatHR)
In addition, a new estimator could be useful to you as well: the
Hi Louise, I have calculated minimum convex polygons with calc_mcp
function from package aspace, but I think this function is not longer
available, so I attach my script using it, where the function is written.
An other tool that I have used is the Hawth's Analysis Tools extension for
ArcGIS:
The script
2012/3/15 Jaime Burbano Girón jaimeb...@gmail.com
Hi Louise, I have calculated minimum convex polygons with calc_mcp
function from package aspace, but I think this function is not longer
available, so I attach my script using it, where the function is written.
An other tool
While I think it is somewhat simplistic for modeling a species' distribution
you can use a convex hull to get a convex bounding polygon for your presence
locations. This will not take into account islands but you can remove
non-terristrial areas by getting an intersection of the bounding
