R: Create an Extent object by drawing on a map

drawExtent {raster} | R Documentation

## Create an Extent object by drawing on a map

### Description

Click on two points of a plot (map) to obtain an object of class `Extent` ('bounding box')

### Usage

    drawExtent(show=TRUE, col="red")

### Arguments

`show` | logical. If `TRUE`, the extent will be drawn on the map
`col` | sets the color of the lines of the extent

### Value

Extent

### Examples

    ## Not run:
    r1 <- raster(nrow=10, ncol=10)
    values(r1) <- runif(ncell(r1))
    plot(r1)
    # after running the following line, click on the map twice
    e <- drawExtent()
    # after running the following line, click on the map twice
    mean(values(crop(r1, drawExtent())))

    ## End(Not run)

[Package raster version 3.0-7 Index]