RgoogleMaps (version 1.2.0.6)

RGB2GRAY: translates an RGB image matrix to gray scale

Description

This function translates the rgb values of the array myTile into a scalar matrix with just one gray value per pixel.

Usage

RGB2GRAY(myTile)

Arguments

myTile

rgb image matrix, usually array with 3 dimensions

Value

• image tile

Details

Gray scale intensity defined as 0.30R + 0.59G + 0.11B

Examples

if (interactive()){

  BrooklynLatLon = getGeoCode("Brooklyn")

  mapBrooklyn <- GetMap(center=BrooklynLatLon, destfile = file.path(tempdir(), "Brooklyn.png"), 

                 zoom=11, size = c(240,240))

  mapBrooklynBW$myTile = RGB2GRAY(mapBrooklyn$myTile)

  PlotOnStaticMap(mapBrooklynBW)

}