subGeom: Extract a sub-polygon or coordinates thereof from a...
In adamlilith/birdsEye: Tools for geographic analysis

Description Usage Arguments Value See Also Examples

View source: R/subGeom.r

This function extracts a sub-polygon or the coordinates of vertices a sub-polygon from a SpatialPolygon or SpatialPolygonDataFrame object.

1	subGeom(x, n)

`x`	SpatialPolygon or SpatialPolygonDataFrame.
`n`	Positive integer(s) indicating which sub-polygon(s) to obtain. To see the number of sub-polygons in an object use `countSubGeoms`. If `NULL`, then the function basically returns `x`, but with all sub-geometries split (i.e., a multi-part polygon/lines).
`out`	Character, either `'poly'` (default) or `'coords'`, indicating the returned object should either be a spatial polygon or a matrix of coordinates.

A spatial polygon object or a two-column matrix.

countSubGeoms, geomToCoords

data(mad0)
sub <- subGeom(mad0, 1)
pts <- geomToCoords(mad0, 1)
plot(sub)
points(pts)

N <- countSubGeoms(mad0)
sub <- subGeom(mad0, N)
plot(sub)

par(mfrow=c(4, 4))
for (n in 1:16) {
sub <- subGeom(mad0, n)
plot(sub)
}