SpatialGridDataFrame function

define spatial grid with attribute data

defines spatial grid by offset, cell size and dimensions

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

Returns

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)