[R-sig-Geo] making wrld_simpl longitude borders something other than (-180, 180)

[Nick Matzke]

Apologies, I got my wires crossed.

What I meant was, how would I make a map where the left edge was at
longitude 100 (e.g. Thailand), and the right edge is at, say 99
(again Thailand).  The Pacific Ocean, and the International Dateline, would
be in the middle of this map.

I tried the obvious thing:
plot(wrld_simpl, xlim = c(100, 99))

...but that produces a flipped map...

Cheers!
Nick


On Mon, Sep 14, 2015 at 3:38 PM, Frede Aakmann Tøgersen <frtog at vestas.com>
wrote:

> Hi Nick
>
> To be honest I do not understand your question so I am guessing that you
> probably only need to set the xlim to c(-100, 100). Here is an example:
>
> > data(wrld_simpl)
> > plot(wrld_simpl)
> > plot(wrld_simpl, xlim = c(-100, 100))
>
> Why would one wants to redefine the longitudes from the interval (-180,
> 180) to (-100, 100)?
>
>
> Yours sincerely / Med venlig hilsen
>
> Frede Aakmann Tøgersen
> Specialist, M.Sc., Ph.D.
> Plant Performance & Modeling
>
> Technology & Service Solutions
> T +45 9730 5135
> M +45 2547 6050
> frtog at vestas.com
> http://www.vestas.com
>
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>
> -----Original Message-----
> From: R-sig-Geo [mailto:r-sig-geo-bounces at r-project.org] On Behalf Of
> Nick Matzke
> Sent: 14. september 2015 06:51
> To: r-sig-geo at stat.math.ethz.ch
> Subject: [R-sig-Geo] making wrld_simpl longitude borders something other
> than (-180, 180)
>
> Hi all,
>
> I would like to plot wrld_simpl, but have the left and right edges of the
> map be at something like 100 degrees longitude, rather than (-180, 180).
>
> I tried messing with the bounding box with no luck.
>
> I can imagine something like burrowing into the object and subtracting 80
> degrees from all the longitudes, but I suspect there must be a better way?
>
> Any help appreciated!
> Nick
>
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