I imported a Shapefile holding a quite detailed world map from: http://www.diva-gis.org
library(sp) library(rgdal) world = readOGR('./countries_shp/', 'countries')
Using R with the sp-Packages, plotting is really easy:
spplot(world, 'UNREG2') plot(world)
Now I want to
- draw a customizable grid
- add points derived from coordinates
For example importing coordinates of Vienna (48°12′32″N 16°22′21″E) can be done using char2dms of the sp-package:
vienna.N = char2dms("48d12'32\"N") vienna.E = char2dms("16d22'21\"E")
But how can a draw a point at this exact location on my map?
Also adding a grid is straight forward:
assuming, that the last plot was created with "plot(world)". How can this be achieved with the spplot output?