Converts a bounding box into a SpatialPolygons object.
Converts a bounding box into a SpatialPolygons object.
bbox2SP(n,s,w,e,bbox=NA,proj4string=CRS("+init=epsg:4326"))This function converts a set of coordinates limiting a bounding box into a SpatialPolygons. It can be used for instance to clip a subset of a larger spatial object (e.g. using gIntersection)
An object of SpatialPolygons class.
library(sp)
run <- FALSE
if (require(rgdal, quietly=TRUE)) run <- TRUE
if (run) {
cities <- readOGR(dsn=system.file("vectors", package = "rgdal")[1], layer="cities")
n<-75
s<-30
w<--40
e<-32
myPoly<-bbox2SP(n,s,e,w)
}
if (run) {
plot(cities)
plot(myPoly,border="red",add=TRUE)
}
if (run) {
bb<-bbox(cities)
myPoly<-bbox2SP(bbox=bb,proj4string=CRS(proj4string(cities)))
plot(myPoly,add=TRUE,border="blue")
}Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.