On Thu, 8 Jan 2009, Hans-Jörg Bibiko wrote:
On 08.01.2009, at 14:27, Roger Bivand wrote:
On Thu, 8 Jan 2009, Hans-Jörg Bibiko wrote:
Hi,
I wonder if there's a workaround to generate seamless maps based on
SpatialPolygons objects. E.g. to produce a map showing Australia at the
left edge and America at the right one ( xlim := min: 110°E , max: 30°W ).
Or the way around, is there a function to re-center a given map by
defining the median longitude? (I know the function 'recenter' which
produce a map from 0° to 360°)
Dear Roger and Matt,
many thanks for the hints. I'll have a look at these.
A further idea if you don't need the polygons is:
wrld_simpl_SL <- as(as(wrld_simpl, "SpatialPolygons"), "SpatialLines")
wrld_simpl_SL_0_360 <- recenter(nowrapSpatialLines(wrld_simpl_SL))
plot(wrld_simpl_SL_0_360, axes=TRUE, xlim=c(110, 330), ylim=c(-80, 80))
which keeps the correct coordinates but at the cost of losing the polygons
and a couple of artefact lines at 180°.
Roger
Best,
--Hans
**********************************************************
Hans-Joerg Bibiko
Max Planck Institute for Evolutionary Anthropology
Department of Linguistics
Deutscher Platz 6 phone: +49 (0) 341 3550 341
D-04103 Leipzig fax: +49 (0) 341 3550 333
Germany e-mail: bib...@eva.mpg.de
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--
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: roger.biv...@nhh.no
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