topo-unary-gConvexHull: Convex Hull of Geometry

In rgeos: Interface to Geometry Engine - Open Source ('GEOS')

Convex Hull of Geometry

Description

Function produces the Convex Hull of the given geometry, the smallest convex polygon that contains all subgeometries

Usage

gConvexHull(spgeom, byid=FALSE, id = NULL)

Arguments

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.

Details

Returns the convex hull as a SpatialPolygons object.

Author(s)

Roger Bivand & Colin Rundel

See Also

gBoundary gCentroid gEnvelope gPointOnSurface

Examples

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)

rgeos documentation built on July 9, 2023, 3:08 p.m.