Convex Hull of Geometry
Function produces the Convex Hull of the given geometry, the smallest convex polygon that contains all subgeometries
gConvexHull(spgeom, byid=FALSE, id = NULL)
spgeom |
sp object as defined in package sp |
byid |
Logical determining if the function should be applied across subgeometries (TRUE) or the entire object (FALSE) |
id |
Character vector defining id labels for the resulting geometries, if unspecified returned geometries will be labeled based on their parent geometries' labels. |
Returns the convex hull as a SpatialPolygons object.
Roger Bivand & Colin Rundel
x = readWKT(paste("POLYGON((0 40,10 50,0 60,40 60,40 100,50 90,60 100,60",
"60,100 60,90 50,100 40,60 40,60 0,50 10,40 0,40 40,0 40))"))
ch = gConvexHull(x)
plot(x,col='blue',border='blue')
plot(ch,add=TRUE)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.