Do zoom of a city in a map R tmap

Question

I am working with tmaps and I'm plotting Colombia's map, which has a very small city (city == "San Andrés"). When I plot the map I have this:

tm_shape(mapa_municipal) +
  tm_borders ()+
  tm_polygons("Ganador_20181V")

I have seen in some pages that it is possible to do a zoom to that part, like this:

Does anybody knows how to do this? Thanks in advance!

Have a look of this link (https://github.com/r-tmap/tmap/issues/541) — jazzurro, Sep 07 '21 at 01:01

score 1 · Accepted Answer · answered Sep 08 '21 at 00:55

That is called a mini map or auxuliar map. In tmap you can do it by creating the two maps independetly and then pasting them together with the print() function. You will have to add a viewport in the vp argument.

For more information check this tutorial: https://orlando-sabogal.github.io/SpatialAnalysis-MontevideoWorkshop2019/Notebooks/tmap-tutorial.nb.html#auxiliar-map

The code would look something like this:

MontevideoMap <- tm_shape(Montevideo) + 
  tm_polygons() +
  tm_shape(Accidents) + tm_bubbles()
UruguayMap <- tm_shape(Uruguay) + 
  tm_polygons()
library(grid)
MontevideoMap
print(UruguayMap, vp = viewport(0.17, 0.8, width = 0.25, height = 0.25))

Do zoom of a city in a map R tmap

1 Answers1