sp (version 0.7-10)

image.SpatialGridDataFrame: image gridded spatial data, or convert to format for image

Description

Convert gridded data in SpatialGridDataFrame to image format; call image on data in SpatialGridDataFrame format

Usage

image.SpatialGridDataFrame(x, attr = 1, xcol = 1, ycol = 2, asp = 1, xlab, ylab, ...)
as.image.SpatialGridDataFrame(x, xcol = 1, ycol = 2)

Arguments

x

object of class SpatialGridDataFrame

attr

column number of attribute variable; this may be the column name in the data.frame of data (as.data.frame(data)), or a column number

xcol

column number of x-coordinate, in the coordinate matrix

ycol

column number of y-coordinate, in the coordinate matrix

asp

aspect ratio of unit x and unit y axis

xlab

label for x-axis

ylab

label for y-axis

...

arguments passed to image, see examples

Value

• as.image.SpatialGridDataFrame returns the list with elements x and y, containing the coordinates of the cell centres of a matrix z, containing the attribute values in matrix form as needed by image.

See Also

image.default, SpatialGridDataFrame-class, levelplot in package lattice

Examples

data(meuse.grid)
coordinates(meuse.grid) = c("x", "y") # promote to SpatialPointsDataFrame
gridded(meuse.grid) = TRUE            # promote to SpatialGridDataFrame
image(meuse.grid["dist"], main = "Distance to river Meuse")
data(meuse)
coordinates(meuse) = c("x", "y")
points(coordinates(meuse), pch = "+")