For European projects, we commonly use the official European Terrestrial
Reference System
(www.euref.eu). You can convert your data from the longlat system to the ETRS
using:
> library(maptools)
> proj4string(pointmap) <- CRS("+proj=longlat +datum=WGS84")
> pointmap.etrs <- spTransform(pointmap, CRS("+init=epsg:3035"))
> spplot(pointmap.etrs[1])
To simply (without any intervention) generate a gridded surface showing the
change of values (the
pattern), see: https://stat.ethz.ch/pipermail/r-sig-geo/2008-June/003703.html
Many European GI data you can obtain from: EEA
(http://dataservice.eea.europa.eu); but also take a
look at:
2. Land cover maps (http://www-gem.jrc.it/glc2000/) 3. Landsat images
(http://image2000.jrc.it/) 4.
General type maps (http://www.inspire-geoportal.eu/)
Tom Hengl
http://spatial-analyst.net
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of
Costas Douvis
Sent: dinsdag 10 juni 2008 17:43
To: r-sig-geo@stat.math.ethz.ch
Subject: [R-sig-Geo] alter the lon & lat lines and coastline according to the
grid coordinates
Hi everyone
My problem might be easy to deal with but I have already spent quite some
time and effort with no result. Any help will be appreciated
My data come from an RCM that I ran, Regcm3. My domain spans over the
wider area of Europe. The model grid is Lambert conformal. This means that
the data values that come from the same line or column of a data matrix do
not correspond to the exact same latitude or longitude. I have the values
of latitude and longitude of each grid point in 2 matrices with the same
dimensions as my data
So what I need to do is to plot those data on a map. I guess that the best
way to do this is to plot them on a rectangle map, preferably using
filled.contour (forgetting for a moment that the grid is actually bended),
and afterwards overlay the latitude and longitude lines and the coastline
as they really are on that map (i.e. the lat and lon lines should not be
straight)
Is that possible?
Or do you have a better suggestion?
--
Kostas Douvis
PhD Student
University of Athens - Department of Geography and Climatology
Academy of Athens - Research Centre for Atmospheric Physics and Climatology
email: [EMAIL PROTECTED]
tel: +30-210-8832048, +30-210-8847280
fax: +30-210-8842098
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