read.coastline {oce}R Documentation

Scan a coastline data file

Description

Read a coastline file in mapgen, matlab, or Splus format

Usage

read.coastline(file,type=c("R","S","mapgen"),debug=FALSE)

Arguments

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.

Details

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      28.563330
BUG: the 'arc/info ungenerate' format is not yet understood.

Value

A coastline object containing lat and lon.

Author(s)

Dan Kelley Dan.Kelley@Dal.Ca

References

http://www.ngdc.noaa.gov/mgg/shorelines/shorelines.html

See Also

plot.coastline summary.coastline

Examples

## 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)

[Package oce version 0.1.59 Index]