Re: [R] Map of British Colonial America 1775

[Spencer Graves]

     Thanks for the reply.  I still didn't understand after reading the 
documentation, but the following examples resolved the questions for me: 

library(mapdata)
tst <- map("worldHires", "UK:Bermuda")
     This produced a 57-point polygon from R 1.8.1 (vs. the 83 point 
polygon from S-Plus 6.2 mentioned previously).  To get evn more 
resolution, I tried the following: 

tst0 <- map("worldHires", "UK:Bermuda", res=0)

     This produced a 91-point polygon from R 1.8.1, which matches what 
I got from "tst0 <- map("worldHires", "UK:Bermuda", res=0)" in S-Plus. 

     Thanks again,
     Spencer Graves
Ray Brownrigg wrote:

     I've reviewed the "map" documentation I've found so far with 
S-Plus 6.2 and R including "www.r-project.org" -> search -> "R site 
search" -> "world map" and Becker & Wilkes (1993) "Maps in S" cited in 
the "map" documentation.  I've noticed that, for example, 
'library(maps);  map("world", "UK:Bermuda")' produces an 83-point 
polygon sketch in S-Plus 6.2 but only a degenerate 3-point polygon (with 
the third point = the first) in R 1.8.1. 

   

You need the mapdata package.  The default "world" database in S-Plus is
the high-resolution one (with also "world.thin").  In R the high
resolution one is "worldHires" from mapdata (mainly so that the
standard maps package is a manageable size).
Ray Brownrigg

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