Hi Mark,
The easy way is a two step process, using the sp and rgdal packages.
Create a SpatialPointsDataFrame using the SpatialPointsDataFrame
function in sp, and then write it out using the writeOGR function in
rgdal. You can get things correct coordinate system by using
CRS("+init=epsg:4979") for the proj4string argument to
SpatialPointsDataFrame, although there are a number of other EPSG codes
that corresponds to WGS84 geographic coordinates.
Dan
On Sun, 2009-12-20 at 11:21 -0600, Mark Na wrote:
Hello, I have an R dataframe with four columns (lat, long, date and time); these data were imported from a .gpx and then manipulated. Now, I'd like to write these data to a shapefile, using lat and long to specify the spatial coordinates and specifying WGS 84 for the geographic coordinate system. I'd appreciate any pointers, thank you. Mark Na [[alternative HTML version deleted]]
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Dan Putler Sauder School of Business University of British Columbia