SpatialPolygons-class {sp} | R Documentation |
class to hold polygon topology (without attributes)
Objects can be created by calls to the function SpatialPolygons
polygons
:Object of class "list"
; list elements are
all of class Polygons-class
plotOrder
:Object of class "integer"
; integer array
giving the order in which objects should be plotted
bbox
:Object of class "matrix"
; see Spatial-class
proj4string
:Object of class "CRS"
; see CRS-class
Class "Spatial"
, directly.
Methods defined with class "SpatialPolygons" in the signature:
signature(obj = "SpatialPolygons")
: select subset of (sets of) polygons; NAs are not permitted in the row index
signature(x = "SpatialPolygons", y = "missing")
:
plot polygons in SpatialPolygons object
signature(object = "SpatialPolygons")
: summarize object
signature(object = "SpatialPolygons")
: rbind-like method
rbind
calls the function SpatialPolygons
, where it is
checked that all IDs are unique. If rbind
-ing SpatialPolygons
without
unique IDs, it is possible to set the argument makeUniqueIDs = TRUE
, although
it is preferred to change these explicitly with spChFIDs
.
Roger Bivand
grd <- GridTopology(c(1,1), c(1,1), c(10,10)) polys <- as.SpatialPolygons.GridTopology(grd) plot(polys) #text(coordinates(polys), labels=sapply(slot(polys, "polygons"), function(i) slot(i, "ID")), cex=0.6) text(coordinates(polys), labels=row.names(polys))