Class "SpatialPointsDataFrame"

Description

Class for spatial attributes that have spatial point locations

Objects from the Class

Objects can be created by calls of the form coordinates(x) = c("x", "y") . or of the form coordinates(x) = xy; see coordinates.

Slots

data:

Object of class data.frame containing the attribute data (may or may not contain the coordinates in its columns)

coords:

Object of class "matrix"; the coordinates matrix (points are rows in the matrix)

coords.stripped

Object of class logical; if TRUE, when the object was created the coordinates were retrieved from the data.frame, and hence stripped from it; after coercion to data.frame, e.g. by as.data.frame(x), coordinates will again be added (as first few columns) to the data.frame

bbox:

Object of class "matrix"; bounding box

proj4string:

Object of class "CRS"; projection string

Extends

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

Methods

[

signature(x = "SpatialPointsDataFrame"): subset rows or columns; in case of row subsetting, the coordinates are also subsetted

coerce

signature(from = "SpatialPointsDataFrame", to = "data.frame"): extracts the attribute part

coordinates

signature(obj = "SpatialPointsDataFrame"): retrieves the coordinates only

show

signature(object = "SpatialPointsDataFrame"): print method

summary

signature(object = "SpatialPointsDataFrame"): summarize object

points

signature(x = "SpatialPointsDataFrame"): add points to plot

Note

Author(s)

Edzer J. Pebesma, e.pebesma@geo.uu.nl

References

See Also

coordinates, SpatialPoints-class

Examples

data(meuse)
xy = meuse[c("x", "y")] # retrieve coordinates as data.frame
class(meuse)
data(meuse) # reload data.frame
coordinates(meuse) = c("x", "y") # specify column names
class(meuse)
data(meuse) # reload data.frame
coordinates(meuse) = c(1, 2) # specify column names
class(meuse)
data(meuse) # reload data.frame
coordinates(meuse) = ~x+y # formula
class(meuse)
data(meuse) # reload data.frame
coordinates(meuse) = xy   # as data frame
class(meuse)
data(meuse) # reload data.frame
coordinates(meuse) = as.matrix(xy)   # as matrix
meuse$log.zn = log(meuse$zinc)
class(meuse)
dim(meuse)