As Ted Harding suggested in an earlier reply, the conversions can be complicated. Most GPS units provide both geodetic coordinates (latitude, longitude) and coordinates in the Universal Transverse Mercator projection (northings and eastings in meters). See the r-help thread on "map projections" between 20 April and 23 April 2001. Also see public domain software available at http://mapping.usgs.gov/www/html/cartsoft.html. For background on map projections try a web search, e.g. http://www.colorado.edu/geography/gcraft/notes/mapproj/mapproj_f.html. Denis White US EPA, 200 SW 35th St, Corvallis, Oregon, 97333 USA voice: 541.754.4476, email: white.denis at epa.gov web: www.epa.gov/wed/pages/staff/white/ Patrick Connolly <P.Connolly at hortresea To: r-help at stat.math.ethz.ch rch.co.nz> (R-help) Sent by: cc: owner-r-help at stat.mat Subject: [R] Easting and northing h.ethz.ch cf. Latitude and longitude 06/21/2001 21:47 Please respond to Patrick Connolly I think I've seen this discussed here before but it doesn't seem to appear in the archive. I am using the map package which so far has been fine for my purposes. Some people I work with have GPS type data that defines positions as number of metres not degrees. I don't know how much the system varies, but in New Zealand, they are referred to as Eastings and Northings. What I would like to know is how complicated it is to convert between such data and the normal latitude and longitude that the map package uses. I assume various datum points are used for different parts of the world, and knowing the appropriate one and the definition of a "northing" and an "easting", the conversion would be relatively straight forward. TIA -- ************************************************************* Patrick Connolly HortResearch Great minds discuss ideas; Mt Albert Average minds discuss events; Auckland Small minds discuss people. New Zealand .... Anon Ph: +64-9 815 4200 x 7188 ************************************************************* ______________________________________________________ The contents of this e-mail are privileged and/or confidential to the named recipient and are not to be used by any other person and/or organisation. If you have received this e-mail in error, please notify the sender and delete all material pertaining to this e-mail. ______________________________________________________ -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-. -.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._. _._._ -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
Easting and northing cf. Latitude and longitude
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