sp (version 0.7-6)

SpatialPixels: define spatial grid

Description

defines spatial grid by offset, cell size and dimensions

Usage

GridTopology(cellcentre.offset, cellsize, cells.dim)
SpatialPixels(points, tolerance = 10 * .Machine$double.eps)
SpatialGrid(grid, proj4string = CRS(as.character(NA)))
coordinatevalues(obj)
points2grid(points, tolerance)
getGridIndex(cc, grid, all.inside = TRUE)
getGridTopology(obj)
areaSpatialGrid(obj)

Arguments

cellcentre.offset
numeric; vector with the smallest coordinates for each dimension
cellsize
numeric; vector with the cell size in each dimension
cells.dim
integer; vector with number of cells in each dimension
points
coordinates, object of class SpatialPoints-class
grid
grid topology; object of class GridTopology-class
tolerance
precision, used to which extent points are exactly on a grid
proj4string
object of class CRS-class
obj
object of class or deriving from SpatialGrid-class
cc
numeric matrix with coordinates
all.inside
logical; if TRUE and cc points fall outside the grid area, an error message is generated; if FALSE, NA values are generated for such points

Value

  • GridTopology returns a value of class GridTopology-class; SpatialGrid returns an object of class SpatialGrid-class

    coordinatevalues returns a list with the unique x-coordinates, the unique y-coordinate, etc. instead of the coordinates of all grid cells

    SpatialGrid returns an object of class SpatialGrid-class.

    points2grid returns the GridTopology-class from a set of points.

    getGridIndex finds the index of a set of point coordinates in a given grid topology, and depending on all.inside setting, generates NA or an error message if points are outside the grid domain.

    getGridTopology returns the slot of class GridTopology-class from obj.

    areaSpatialGrid returns the spatial area of (the non-missing valued cells of) the grid. For objects of class SpatialGridDataFrame-class the area refers to cells where any (one or more) of the attribute columns are non-missing valued.

See Also

SpatialGrid-class, SpatialGridDataFrame-class,

Examples

Run this code
x = GridTopology(c(0,0), c(1,1), c(5,4))
class(x)
x
summary(x)
coordinates(x)
coordinates(GridTopology(c(0,0), c(1,1), c(5,4)))
coordinatevalues(x)

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