coerce-sp-methods: Coerce '"SpatialPolygons"' to '"owin"'

In polyCub: Cubature over Polygonal Domains

Coerce "SpatialPolygons" to "owin"

Description

Package polyCub implements coerce-methods (as(object, Class)) to convert "SpatialPolygons" (or "Polygons" or "Polygon") of package sp to "owin" of package spatstat.geom. They are also available as as.owin.* functions to support polyCub.midpoint.

Usage

as.owin.SpatialPolygons(W, ...)

as.owin.Polygons(W, ...)

as.owin.Polygon(W, ...)

Arguments

W	an object of class "SpatialPolygons", "Polygons", or "Polygon".
...	further arguments passed to owin.

Author(s)

Sebastian Meyer

See Also

xylist

Examples

if (require("spatstat.geom") && require("sp")) {
    diamond <- list(x = c(1,2,1,0), y = c(1,2,3,2))  # anti-clockwise
    diamond.owin <- owin(poly = diamond)
    diamond.sp <- Polygon(lapply(diamond, rev))      # clockwise
    stopifnot(identical(xylist(diamond.sp), list(diamond)))
    diamond.owin_from_sp <- as.owin(diamond.sp)
    stopifnot(all.equal(diamond.owin, diamond.owin_from_sp))

    ## similarly works for Polygons and SpatialPolygons
    diamond.Ps <- as(diamond.sp, "Polygons")
    stopifnot(identical(diamond.owin, as.owin(diamond.Ps)))
    diamond.SpPs <- SpatialPolygons(list(diamond.Ps))
    stopifnot(identical(xylist(diamond.SpPs), list(diamond)))
    stopifnot(identical(diamond.owin, as.owin(diamond.SpPs)))
}

polyCub documentation built on April 3, 2025, 9:37 p.m.