Possibly something similar to
abline(v=seq(long.min, long.max, length=3)
abline(h=seq(lat.min, lat.max, length=3)
?
The above will add vertical and horizontal lines to an existing plot, and
assumes that the plot is in long/lat coordinates. Of course, this ignores
the fact that long/lat is not a cartesian coordinate system.
(can't provide more detail without more information)
-Don
--
Don MacQueen
Lawrence Livermore National Laboratory
7000 East Ave., L-627
Livermore, CA 94550
925-423-1062
-----Original Message-----
From: Jaimin Dave <davejaiminm at gmail.com>
Date: Mon, 4 Apr 2011 18:39:45 -0700
To: "r-help at r-project.org" <r-help at r-project.org>
Subject: [R] Grid on Map
>I am new to R.I want to draw grid from a csv file which contains latitude
>minimum ,latitude maximum ,longitude minimum ,longitude maximum.The grid
>should be divided into exactly 4 quadrants. The map is of NY state of
>USA. I
>want to know how can I do it.
>Help would be appreciated.
>
>Thanks
>Jaimin
>
> [[alternative HTML version deleted]]
>
>______________________________________________
>R-help at r-project.org mailing list
>https://stat.ethz.ch/mailman/listinfo/r-help
>PLEASE do read the posting guide
>http://www.R-project.org/posting-guide.html
>and provide commented, minimal, self-contained, reproducible code.