Class "SpatialPointsDataFrame"

Description

Class for spatial attributes that have spatial point locations

Usage

  ## S4 method for signature 'SpatialPointsDataFrame':
  x[i, j, ..., drop = TRUE]
  ## S4 method for signature 'SpatialPointsDataFrame,
  ##   SpatialPoints':
  coerce(from, to, strict=TRUE)
  ## S4 method for signature 'SpatialPointsDataFrame,
  ##   data.frame':
  coerce(from, to, strict=TRUE)
  ## S4 method for signature 'SpatialPointsDataFrame':
  coordinates(obj)
  ## S4 method for signature 'SpatialPointsDataFrame':
  show(object)
  ## S4 method for signature 'SpatialPointsDataFrame':
  points(x)
  ## S3 method for class 'SpatialPointsDataFrame':
  rbind(...)

Arguments

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.nrs

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".

Author(s)

Edzer Pebesma, edzer.pebesma@uni-muenster.de

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)