Hello, it seems that this crs corresponds to the epsg code 27700 - I found the epsg code here http://en.wikipedia.org/wiki/Ordnance_Survey_National_Grid - you can look here http://spatialreference.org/ref/epsg/27700/
You can use the complete Proj4 definition http://spatialreference.org/ref/epsg/27700/proj4/ CRS("+proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717 +x_0=400000 +y_0=-100000 +ellps=airy +datum=OSGB36 +units=m +no_defs") or use the epsg code CRS("+init=epsg:27700") Hope this helps, Emmanuel Le 18/06/2012 12:17, Simon Parker a écrit : > Does anyone how to define the CRS for the United Kingdom ordnance survey > National Grid system? > > > What is the equivalent of the following? > > CRS('+proj=longlat +ellps=GRS80 +datum=NAD83 +no_defs') > > > Thankyou. > [[alternative HTML version deleted]] > > _______________________________________________ > R-sig-Geo mailing list > [email protected] > https://stat.ethz.ch/mailman/listinfo/r-sig-geo -- *Emmanuel Blondel* GIS Consultant Geographic Information Systems in Agronomy - Environment -Fisheries Email: [email protected] - [email protected] Phone: +33 6 45 97 87 52 [[alternative HTML version deleted]]
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