sp: SpatialGridDataFrame – R documentation

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SpatialGridDataFrame

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

Examples

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

sp

Classes and Methods for Spatial Data

v1.4-5

GPL (>= 2)

Authors

Edzer Pebesma [aut, cre], Roger Bivand [aut], Barry Rowlingson [ctb], Virgilio Gomez-Rubio [ctb], Robert Hijmans [ctb], Michael Sumner [ctb], Don MacQueen [ctb], Jim Lemon [ctb], Finn Lindgren [ctb], Josh O'Brien [ctb], Joseph O'Rourke [ctb]

Initial release