Dear all,
I am currently plotting very simple marine species distributions based on
presence data using gConvexhull. The species I am working on is large and
cosmopolitan, so I would like to be able to plot a distribution that �wraps�
around the world, but in a 2d. So it the below example, the polygon would
extend east and west to the edge of the world map:
rm(list=ls())
library(maptools)
library(rgeos)
data(wrld_simpl)
sightings <- gConvexHull(readWKT("GEOMETRYCOLLECTION(POINT(-120 -45), POINT(20
0), POINT(0 30), POINT(150 -50), POINT(-160 20), POINT(60 -10), POINT(145
-5))"))
plot(sightings, col="lightblue", lty=0, xlim=c(-180, 180))
plot(wrld_simpl, add=T, col="black")
Any help much appreciated.
Chris
_______________________________________________
Dr Christopher Clements
The University of Z�rich,
Switzerland
Research: www.chrisclementsresearch.co.uk
Email: chrisclementsresea...@gmail.com
Mobile: (+44)7708945975
Twitter: CClements88
Skype: chris.clements88
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