coercion between sp objects and spatstat objects

Description

S4-style as() coercion works from objects of S4 sp classes to spatstat S3 classes, but not the reverse. Coercion to sp classes uses direct function calls.

Usage

as.SpatialPoints.ppp(from)
as.SpatialPointsDataFrame.ppp(from)
as.SpatialGridDataFrame.ppp(from)
as.SpatialGridDataFrame.im(from)

Arguments

Methods

coerce

signature(from = "SpatialPoints", to = "ppp")

coerce

signature(from = "SpatialPointsDataFrame", to = "ppp")

coerce

signature(from = "SpatialGridDataFrame", to = "ppp")

coerce

signature(from = "SpatialPolygons", to = "owin")

coerce

signature(from = "SpatialPixelsDataFrame", to = "owin")

coerce

signature(from = "SpatialGridDataFrame", to = "owin")

coerce

signature(from = "SpatialGridDataFrame", to = "im")

Author(s)

Edzer Pebesma e.pebesma@geo.uu.nl, Roger Bivand

Examples

library(spatstat)
data(meuse)
coordinates(meuse) = ~x+y
zn1 <- as(meuse["zinc"], "ppp")
zn1
plot(zn1)
as(as(meuse, "SpatialPoints"), "ppp")
data(meuse.grid)
gridded(meuse.grid) = ~x+y
mg_owin <- as(meuse.grid, "owin")
zn1a <- ppp(x=zn1$x, y=zn1$y, marks=zn1$marks, window=mg_owin)
zn1a
plot(zn1a)
rev_ppp_SP <- as.SpatialPoints.ppp(zn1a)
summary(rev_ppp_SP)
rev_ppp_SPDF <- as.SpatialPointsDataFrame.ppp(zn1a)
summary(rev_ppp_SPDF)
rev_ppp_SGDF <- as.SpatialGridDataFrame.ppp(zn1a)
summary(rev_ppp_SGDF)
# as.owin(meuse.grid)
# --- will only work if as.owin is method...
mg_owin <- as(as(meuse.grid["ffreq"], "SpatialPixelsDataFrame"), "owin")
mg_owin
ho_sp <- SpatialPolygons(list(Polygons(list(Polygon(cbind(c(0,1,1,0,0),
  c(0,0,1,1,0))), Polygon(cbind(c(0.6,0.4,0.4,0.6,0.6), 
  c(0.2,0.2,0.4,0.4,0.2)), hole=TRUE)), ID="ho")))
plot(ho_sp, col="red", pbg="pink")
ho <- as(ho_sp, "owin")
plot(ho)
pp <- runifpoint(500, win=ho)
plot(pp)
ho_orig <- owin(poly=list(list(x=c(0,1,1,0), y=c(0,0,1,1)),
  list(x=c(0.6,0.4,0.4,0.6), y=c(0.2,0.2,0.4,0.4))))
identical(ho, ho_orig)
mg_dist <- meuse.grid["dist"]
fullgrid(mg_dist) <- TRUE
image(mg_dist, axes=TRUE)
mg_im <- as(mg_dist, "im")
plot(mg_im)
mg2 <- as.SpatialGridDataFrame.im(mg_im)
image(mg2, axes=TRUE)