I have map A from the code below.
usmp <- map_data("usa")
usamplt<-ggplot() +
geom_map(data=usmp, map=world, aes(x=long, y=lat, map_id=region), fill = 'grey70')+
scale_x_continuous(breaks=seq(-60,-130,-5),labels=seq(-60,-130,-5),expand=c(0,0))+
scale_y_continuous(breaks=seq(20,50,5),labels=seq(20,50,5),expand=c(0,0))
coord_map(projection="azequalarea")
usamplt
Map A
The odd thing about this map is both the labels in x and y are not matching with corresponding grid lines. It is not a problem in Map B.
I know this is because of the projection coord_map(projection="azequalarea"). I am wondering, in Map A how to label those points corresponding to grid line. i.e. I want to touch each grid lines by corresponding labels as in Map B but with new projection
coord_map(projection="azequalarea")