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my_lines
2012 May 01
0
Plotting shapefiles on existing maps
...you know the projection of the shapefile (or if there is a *.prj file
accompanying the *.shp), try using the transform() method in the rgdal
package to do this.
If there is a *.prj file, this should work:
library(rgdal)
my_lines <- readOGR(<directory>, <shapefile_without_extension>)
my_lines1 <- transform(my_lines, CRS("+proj=longlat +ellps=WGS84"))
*I believe the above line should be: my_lines1 <- spTransform(my_lines,
CRS("+proj=longlat +ellps=WGS84"))
plot(my_lines1, add=TRUE)
If not, you'll need to work out exactly what the projection is, and set it...