[R-sig-Geo] Maps across the dateline

[Gregory Snow]

There is a function recenter.Map in the TeachingDemos package that works
with the maptools package (rather than the maps package).  This function
is pretty basic and easy to break, but it may do what you want (or give
you a place to start on creating a better solution).

Hope this helps,

-- 
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at intermountainmail.org
(801) 408-8111
 
 

> -----Original Message-----
> From: r-sig-geo-bounces at stat.math.ethz.ch 
> [mailto:r-sig-geo-bounces at stat.math.ethz.ch] On Behalf Of Anne Hertel
> Sent: Thursday, January 19, 2006 10:25 AM
> To: r-sig-geo at stat.math.ethz.ch
> Subject: [R-sig-Geo] Maps across the dateline
> 
> Hello,
> 
> I'm trying to plot some data for the Pacific Ocean and want 
> to get a map onto my plot as well. I'm using the function 
> 'map()' from library(maps). However, I cannot get it to plot 
> anything across the dateline since it requires that 
> longitudes between 180 and 360 degrees east to be written as 
> negative degrees east of Greenwich (e.g. -180 to 0 degrees 
> east). The longitudes I want to plot are 135 to 255 degrees 
> east but the function map() wants that to be written 135 to 
> 180 degrees east and -180 to -105 degrees east, so I would 
> have to divide the grid up in two. But even if I do that I 
> can't plot it together because -180 doesn't come after 180.
> 
> Does anyone have a way to plot something across the dateline? 
> I only want a map of the Pacific, not the rest of the world.
> 
> Thanks,
> Anne Hertel
> 
> 
> ------------------------------------------------------------
> Anne M. K. Hertel
> Grad. Student & Research Assistant
> Department of Atmospheric Sciences
> University of Illinois at Urbana-Champaign Annex II, room 204
> Phone: (217) 333 6296
> 
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