[R] Mapping the coordinates!

[Johannes Huesing]

Mehdi Zarrei <gagzarrei at yahoo.com> [Sun, Oct 10, 2010 at 06:11:23AM CEST]:
> 
> 
> 
> 	
> 	
> 	
> 	
> 	
> 	
> 
> Hello,
> 
> 
> 
> I have a series of coordinates
> (latitudes and longitudes) each one/several associated to a code
> (from 1 to 28). I used function points (latitude, longitudes) to
> transfer them to a per-prepared map. 
> 
> 
> 
> 
> 1- I wonder how  I might be able to
> automatically add codes (1-28) to the map too? 

Type ?text at the R prompt.

> 
> 2-Moreover,  mostly there are a few
> codes from the identical coordinates. What is the function to avoid
> overlapping of codes on the map? 
> 

jitter() adds some noise, I don't know of this is sufficient for you.

> 
> 3- I want to draw closed line around
> some geographical areas to define the habitats. 

If you search for "convex hull" in rseek.org, you may find something 
relevant for you. I did this and the third result was

http://addictedtor.free.fr/graphiques/RGraphGallery.php?graph=61

-- 
Johannes Hüsing               There is something fascinating about science. 
                              One gets such wholesale returns of conjecture 
mailto:johannes at huesing.name  from such a trifling investment of fact.                
http://derwisch.wikidot.com         (Mark Twain, "Life on the Mississippi")