Tmap: Possible to have degrees on tm_grid labels?

[smwoodman]

Is it possible within to have tm_grid labels have degrees symbols when plotting lat/long data, a la the sf plotting function illustrated below? Imo this makes the tick labels (or in tmap's current option, grid labels) nicer when plotting lat/long spatial data. And if not and this is an easy addition, could this be added as an enhancement? Thanks!

library(sf)
library(spData)
library(tmap)

nz.ll <- st_transform(nz, 4326)

# Default sf version; axis tick labels include '°E' or '°S' (or '°W' or '°N' if map is of that part of the world)
plot(st_geometry(nz.ll), axes = T)

# Default tmap version
tm_shape(nz.ll) +
  tm_borders() +
  tm_grid()

# tmap with only degrees symbols - not sure how to differentiate between x and y labels for E/W or N/S addition to label
tm_shape(nz.ll) +
  tm_borders() +
  tm_grid(labels.format = list(fun = function(i) parse(text = paste(i, "*degree"))))

[mtennekes]

Thanks for this suggestion! It would make sense to use degrees as default for lat/lon coordinates.

[Nowosad]

It's here! https://github.com/mtennekes/tmap/issues/315