raster (version 1.8-3)

click: Click on a map

Description

Click on a map (plot) to get values of a Raster* object at a location; and optionally the coordinates and cell number of the location. Multiple locations can be clicked on by specifying n=.

Usage

click(object, n=1, id=FALSE, xy=FALSE, cell=FALSE, type = "n", ...)

Arguments

object

Raster* object

n

number of clicks on the map

id

Logical. If TRUE, a numeric ID is shown on the map that corresponds to the row number of the output

xy

Logical. If TRUE, xy coordinates are included in the output

cell

Logical. If TRUE, cell numbers are included in the output

type

One of "n", "p", "l" or "o". If "p" or "o" the points are plotted; if "l" or "o" they are joined by lines. See ?locator

...

additional graphics parameters used if type != "n" for plotting the locations. See ?locator

Value

• The value(s) of object at the point(s) clicked on; and the coordinates of the center of the cell if xy==TRUE.

See Also

drawExtent

Examples

r <- raster(system.file("external/test.grd", package="raster"))
#plot(r)
#click(r)
#now click on the plot (map)