| read.coastline {oce} | R Documentation |
Read a coastline file in mapgen, matlab, or Splus format
read.coastline(file,type=c("R","S","mapgen"),debug=FALSE)
file |
Name of file containing coastline data. |
type |
Type of file, one of "R", "S", or "mapgen" |
debug |
Set to TRUE to print information about the header, etc. |
The S and R formats are identical, and consist of two columns, lon and lat, with land-jump segments separated by lines with two NAs.
The MapGen format is of the form
# -b -16.179081 28.553943 -16.244793 28.563330BUG: the 'arc/info ungenerate' format is not yet understood.
A coastline object containing lat and lon.
Dan Kelley Dan.Kelley@Dal.Ca
http://www.ngdc.noaa.gov/mgg/shorelines/shorelines.html
plot.coastline
summary.coastline
## Not run:
library(oce)
cl <- read.coastline("7404.dat")
# If no plot yet:
plot(cl)
# To add to an existing plot:
lines(cl$lon, cl$lat)
# Note: another trick is to do something like the following,
# to get issues of whether longitude is defined in (-180,180)
# or (0,360)
lines(cl$lon, cl$lat)
lines(cl$lon_360, cl$lat)
## End(Not run)