convert point and map coordinates UTM to WSG
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 Mar? 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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