Add Text/Symbols to GMT Map
Call GMT to add text/symbols to a map and save in postscript format.
pstext(x, cmd="-J -R -O -K", file=getOption("gmt.file"))
x: data frame, matrix, or filename containing the data to be plotted.cmd: string of arguments passed to GMT shell command pstext .file: filename where the map is saved.The cmd argument can be used to specify the data columns:
Format ( cmd ) | Data columns | Notes |
-J -R -O -K | Lon Lat Text | (default) |
-J -R -F+f+a+j -O -K | Lon Lat Font Angle Justify Text | (see example) |
If x is a filename, the data should be tabular with or without a header, separated by commas or whitespace. The first line is interpreted as header if the first non-whitespace character is not minus, point, or number.
See the GMT documentation for details on pstext and other GMT commands.
NULL, but the map is annotated and saved in postscript format.
The temporary GMT input file text.gmt is saved in directory dirname(tempdir()), for the user to view or edit. It is later removed by psclose().
Similar to text and postscript in native graphics.
gmt, pscoast, psxy, pstext, psbar, and psclose work together to draw maps.
gmt-package gives an overview of the package.
## Not run: # Draw map and save as "map.ps" in current working directory gmt(demo.par) pscoast(demo.coast) psxy(demo.xy) pstext(demo.text, "-J -R -F+f+a+j -O -K") psbar(demo.bar, ref=66) psclose() # See directory gmt/example for details ## End(Not run)