SpatialPolygonsDataFrame-class

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Class "SpatialPolygonsDataFrame"

class to hold polygons with attributes

Keywords
classes
Note

SpatialPolygonsDataFrame with default ID matching checks the data frame row names against the Polygons ID slots. They must then agree with each other, and be unique (no Polygons objects can share IDs); the data frame rows will be re-ordered if needed to match the Polygons IDs..

If you want to rbind objects with duplicated IDs, seespChFIDs.

Objects from the Class

Objects can be created by calls to the function SpatialPolygonsDataFrame

Extends

Class "SpatialPolygons", directly. Class "Spatial", by class "SpatialPolygons".

See Also

SpatialPolygons-class

Aliases
  • SpatialPolygonsDataFrame-class
  • [,SpatialPolygonsDataFrame-method
  • as.data.frame.SpatialPolygonsDataFrame
  • coerce,SpatialPolygonsDataFrame,data.frame-method
  • coerce,SpatialPolygonsDataFrame,SpatialLinesDataFrame-method
  • rbind.SpatialPolygonsDataFrame
  • dim.SpatialPolygonsDataFrame
  • row.names.SpatialPolygonsDataFrame
Examples
# simple example, from scratch:
Sr1 = Polygon(cbind(c(2,4,4,1,2),c(2,3,5,4,2)))
Sr2 = Polygon(cbind(c(5,4,2,5),c(2,3,2,2)))
Sr3 = Polygon(cbind(c(4,4,5,10,4),c(5,3,2,5,5)))
Sr4 = Polygon(cbind(c(5,6,6,5,5),c(4,4,3,3,4)), hole = TRUE)

Srs1 = Polygons(list(Sr1), "s1")
Srs2 = Polygons(list(Sr2), "s2")
Srs3 = Polygons(list(Sr3, Sr4), "s3/4")
SpP = SpatialPolygons(list(Srs1,Srs2,Srs3), 1:3)
plot(SpP, col = 1:3, pbg="white")grd <- GridTopology(c(1,1), c(1,1), c(10,10))
polys <- as(grd, "SpatialPolygons")
centroids <- coordinates(polys)
x <- centroids[,1]
y <- centroids[,2]
z <- 1.4 + 0.1*x + 0.2*y + 0.002*x*x
ex_1.7 <- SpatialPolygonsDataFrame(polys,
 data=data.frame(x=x, y=y, z=z, row.names=row.names(polys)))
brks <- quantile(z, seq(0,1,1/7))
cols <- grey((length(brks):2)/length(brks))
dens <- (2:length(brks))*3
plot(ex_1.7, col=cols[findInterval(z, brks, all.inside=TRUE)])
plot(ex_1.7, density=dens[findInterval(z, brks, all.inside=TRUE)])
Documentation reproduced from package sp, version 1.0-16, License: GPL (>= 2)

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