SpatialPixelsDataFrame {sp}R Documentation

define spatial grid with attribute data

Description

defines spatial grid by offset, cell size and dimensions

Usage

SpatialPixelsDataFrame(points, data, tolerance = 10 * .Machine$double.eps, 
                proj4string = CRS(as.character(NA)))
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
data data.frame; contains the attribute (actual grid) data
tolerance precision up to which extent points should be exactly on a grid
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 J. Pebesma

References

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)
[Package sp version 0.7-12 Index]