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Add a Graticule on the map see https://github.com/turban/Leaflet.Graticule
addGraticule(map, interval = 20, sphere = FALSE, style = list(color = "#333", weight = 1), layerId = NULL, group = NULL, options = pathOptions(pointerEvents = "none", clickable = FALSE))
a map widget object
The spacing in map units between horizontal and vertical lines.
boolean. Default FALSE
path options for the generated lines. See http://leafletjs.com/reference-1.3.1.html#path-option
the layer id
the name of the group this layer belongs to.
the path options for the graticule layer
# NOT RUN { leaf <- leaflet() %>% addTiles() %>% addGraticule() leaf # }
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