concaveman.Rd
This package is a simple R port (through V8
) of a JavaScript library by Vladimir Agafonkin.
The concaveman
function ports the concaveman library from mapbox. It computes the concave polygon for one set of points.
concaveman(points, concavity, length_threshold) # S3 method for matrix concaveman(points, concavity = 2, length_threshold = 0) # S3 method for sf concaveman(points, concavity = 2, length_threshold = 0)
points | the points for which the concave hull must be computed. Can be represented as a matrix of coordinates or an |
---|---|
concavity | a relative measure of concavity. 1 results in a relatively detailed shape, Infinity results in a convex hull. You can use values lower than 1, but they can produce pretty crazy shapes. |
length_threshold | when a segment length is under this threshold, it stops being considered for further detalization. Higher values result in simpler shapes. |
an object of the same class as points
: a matrix of coordinates or an sf
object.
For details regarding the implementation, please see the original javascript library github page. This is just a thin wrapper, via V8
.