Dear Helpers:
I'm trying to use packages "maps" and "mapdata" (see blow) to display the
research resutls on map (Mid-Atlantic region). In particular, I need to mark a
number of points in the map by giving their latitude and longitude information.
For instance, I would like to mark a point on (long, lat) =(75.56027,
39.09271). Also, I need to mark several cities that I suspect might not in the
"world.cities" database such as Baltimore, etc. Presumably, I can do the same
thing by finding out the lat and long infor of Baltimroe and add text next to
the point I mark.
Thanks a billion
Yihsu
library(maps)
library(mapdata)
state.list <- c("maryland","new jersey","west virginia",
"virginia","ohio","delaware","pennsylvania","kentucky","indiana","north
carlina")
map("state",state.list)
map.cities(x=world.cities, Country="US",minpop=100000)
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