sp (version 1.2-3)

SpatialPointsDataFrame-class: Class "SpatialPointsDataFrame"

Description

Class for spatial attributes that have spatial point locations

Usage

"["(x, i, j, ..., drop = TRUE) "coerce"(from, to, strict=TRUE) "coerce"(from, to, strict=TRUE) "coordinates"(obj) "show"(object) "points"(x) "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

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".

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)

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