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)))
points |
coordinates, either as numeric matrix or as object of class SpatialPoints-class |
grid |
grid topology; object of class GridTopology-class; for
calls to |
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 |
proj4string |
object of class CRS-class in the first
form only used when |
SpatialPixelsDataFrame returns an object of class SpatialPixelsDataFrame-class; SpatialGridDataFrame returns an object of class SpatialGridDataFrame-class.
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.
Edzer Pebesma
data(meuse.grid) m = SpatialPixelsDataFrame(points = meuse.grid[c("x", "y")], data = meuse.grid) class(m) summary(m)
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