Wouldn't grass-users, or maybe R-sig-geo be a more appropriate list? Given points in geographical coordinates, use project() or spTransform() in rgdal. The former will not do datum transformation, the latter will. NAD83 is a US datum specification based on WGS84, UTM is a projection but is useless without the zone number. If you can find the datum of your input data:
in_crs <- CRS("+proj=longlat +datum=<whatever>") out_crs <- CRS("+proj=utm +zone=<#> +datum=NAD83 +ellps=WGS84") utm_bbox <- bbox(spTransform(SpatialPoints(ll_crds, proj4string=in_crs), out_crs) will get from one matrix of coordinates to the other. Note that for obvious reasons a rectangle on one side will only rarely be a rectangle on the other, so I've just taken a bounding box. Roger Bivand stephen sefick wrote: > > I am trying to set up a Grass project and need to set up the region so > that I can view the map. I can look at a map and find the lat/lon, > but the map projection is in UTM NAD38 WGS84 and I need to set the > eastings and northings. Is there a package that will help me > calculate this in R. > thanks > > -- > Stephen Sefick > > > > -- View this message in context: http://www.nabble.com/Map-projections---converting-latitude-longitude-to-eastings-and-northings-tp24293706p24304700.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.