Centroid of Geometry
Function calculates the centroid of the given geometry.
gCentroid(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 a SpatialPoints object of the centroid(s) for spgeom.
Roger Bivand & Colin Rundel
x = readWKT(paste("GEOMETRYCOLLECTION(POLYGON((0 0,10 0,10 10,0 10,0 0)),",
"POLYGON((15 0,25 15,35 0,15 0)))"))
# Centroids of both the square and circle independently
c1 = gCentroid(x,byid=TRUE)
# Centroid of square and circle together
c2 = gCentroid(x)
plot(x)
plot(c1,col='red',add=TRUE)
plot(c2,col='blue',add=TRUE)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.