tonerToTrans | R Documentation |
Stamen-toner maps are 3-layer RGB rasters, which are converted to single-layer rasters with indexed colours with whites becoming transparent.
tonerToTrans(x, pattern="(red|green|blue)$", power = 0.5, col='black', threshold=Inf)
x |
A |
pattern |
string passed to |
power |
Values below 1 increase opacity, above 1 increases transparency |
col |
colour for resulting map |
threshold |
colours above this value are transparent |
Intended for 'stamen-toner'
maps.
A SpatRast
with indexed colours
Patrick Brown
openmap
data('worldMap');worldMap = unwrap(worldMap)
origMap = openmap(worldMap[worldMap$NAME == 'Sierra Leone',],
path='stamen-toner',
buffer=100*1000
)
# path = 'https://tiles.stadiamaps.com/tiles/stamen_toner/')
# suffix = '@2x.png')
oldpar= map.new(origMap, bg='green')
plot(origMap, add=TRUE)
transMap = tonerToTrans(origMap)
names(transMap)
map.new(transMap, bg='green')
plot(transMap, add=TRUE)
par(oldpar)
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