[R-sig-Geo] convert point and map coordinates UTM to WSG

[Paul Hiemstra]

Hi,

To transform coordinates you can use the spTransform function from the 
rgdal pacakge. It uses proj4 to do the transformations. Proj uses a 
string to describe a certain projection, the so called proj4string. If 
you can determine the proj4string for both your projections you can 
transform between them. The first string (WGS84) looks like this:

"+proj=longlat +datum=WGS84"

The second (UTM) something like:

"+proj=utm +zone=yourzone +datum=yourdatum"

See the documentation of spTransform for more information on how to use 
the function.

cheers and hth,
Paul

Marc Marí Dell'Olmo wrote:
> Dear R-users,
>
> Can anyone tell me how to convert point coordinates from WSG84 (google
> maps coordinates) format to UTM HUSO-31 ED-50. And if I have a map
> (shp format) with UTM HUSO-31 ED-50 coordinates, how can I convert to
> WSG84 (google maps coordinates) coordinates. Should I install some
> external software?
>
> Can anyone tell me the instructions?
>
> Thank you,
>
> Marc
>
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-- 
Drs. Paul Hiemstra
Department of Physical Geography
Faculty of Geosciences
University of Utrecht
Heidelberglaan 2
P.O. Box 80.115
3508 TC Utrecht
Phone:  +3130 274 3113 Mon-Tue
Phone:  +3130 253 5773 Wed-Fri
http://intamap.geo.uu.nl/~paul