Hi, Barry, Thank you for the reply. Here are a few examples.
They are registered to NAD 83 California Zone V in feet. What I want to map to should be the most common longitude latitude system. For example, 6638699, 1924377 should be projected to -117.745, 34.28 6425591 1894450 6425843 1893769 6425828 1893347 Thank you! Dazhi On Fri, Oct 29, 2010 at 10:19 AM, Barry Rowlingson < b.rowling...@lancaster.ac.uk> wrote: > On Fri, Oct 29, 2010 at 3:10 PM, Dazhi Jiao <dazhi.j...@gmail.com> wrote: > > Hi, > > > > I have a data set with points in NAD83 coordinates. How can I convert > them > > into latitude/longitude use R? > > NAD83 is a datum: > > http://en.wikipedia.org/wiki/North_American_Datum > > so your coordinates might already be latitude and longitude. Or they > could be in meters in some UTM system, both of which could use the > NAD83 datum. Could we see some of them please? > > Also, you need to define what lat-long system you want them converted > to - the most common is WGS84. > > Barry > [[alternative HTML version deleted]] _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo
