SpatialPointsDataFrame-class function

Class "SpatialPointsDataFrame"

Class for spatial attributes that have spatial point locations class

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".

## 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

• x,from,obj,object: SpatialPointsDataFrame object
• to: class to which to coerce
• strict: see as
• i: row indices
• j: column indices
• drop: see Extract
• ...: indices passed through

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)