SpatialPixelsDataFrame {sp}

define spatial grid with attribute data

Description

defines spatial grid by offset, cell size and dimensions

Usage

SpatialPixelsDataFrame(points, data, tolerance = sqrt(.Machine$double.eps), 
		proj4string = CRS(as.character(NA)), round = NULL, grid = NULL)
SpatialGridDataFrame(grid, data, proj4string = CRS(as.character(NA)))

Arguments

points

coordinates, either as numeric matrix or as object of class SpatialPoints-class

grid

grid topology; object of class GridTopology-class; for calls to SpatialPixelsDataFrame a value of NULL implies that this will be derived from the point coordinates

data

data.frame; contains the attribute (actual grid) data

tolerance

precision up to which extent points should be exactly on a grid

round

default NULL, otherwise a value passed to as the digits argument to round for setting cell size

proj4string

object of class CRS-class in the first form only used when points does not inherit from Spatial-class

Value

SpatialPixelsDataFrame returns an object of class SpatialPixelsDataFrame-class; SpatialGridDataFrame returns an object of class SpatialGridDataFrame-class.

Note

SpatialPixels stores grid topology and coordinates of the actual points, which may be in the form of a subset (set of pixels) of a full grid. To find out or change this, see fullgrid and SpatialGrid-class.

Author(s)

Edzer Pebesma

See Also

gridded, gridded<-, SpatialGrid, SpatialGrid-class

Examples

data(meuse.grid)
m = SpatialPixelsDataFrame(points = meuse.grid[c("x", "y")], data = meuse.grid)
class(m)
summary(m)