geolines: Add lines to current plot initialized by geoplot.
In geo: Draw and Annotate Maps, Especially Charts of the North Atlantic

Description Usage Arguments Value Side Effects See Also Examples

Add lines to a plot initialized by geoplot. Data is stored as lat, lon or x,y. Lists are assumed to have the components $x and $y if projection in geoplot was "none", else $lat,$lon. The program transforms the data as specified in geoplot. Similar to the Splus function lies.

1 2	geolines(lat, lon = 0, col = 1, lwd = 0, lty = 0, nx = 1, outside = FALSE, return.data = FALSE)

`lat`	Latitude of data. ( or x coordinate)
`lon`	Longitude of data. ( or y coordinate) Negative values mean western longitudes. Default value is zero. If lon is zero then the data is stored as `lat$lat` and `lat$lon`. (or `lat$x` and `lat$y`)
`col`	Colour number used for plotting the lines, default value is 1.
`lwd`	Line width. Default is to use the width set when the program was called.
`lty`	Line type. Default is to use the width set when the program was called. See Splus manuals for numbers corresponding to different linetypes and linewidths.
`nx`	Parameter only used with Lambert transform when lines in lat,lon are curves in x,y. If nx > 1, nx-1 points are put between each two datapoints in lat, lon before projection is done. For example: `geolines(c(66, 66), c(-30, -10), nx = 50)` plots a line onto the 66 degree latitude from -30 to -10. The line is curved because it is made of 50 segments.
`outside`	Logical, should lines outside the plot region be drawn? Default FALSE.
`return.data`	Logical, should the data be returned? Default FALSE.

No values returned.

The projection is stored in geopar\$projection and parameters for the transform in geopar$b0, geopar$b1 and geopar$l1.

geoplot, geopolygon, geopoints, geotext, geosymbols, geocontour.fill, geogrid, geocontour.

       geolines(island)                      # plot iceland.
       geolines(island$lat, island$lon, col = 1) # same.

       #######################################################

       geoplot(xlim=c(0, -50), ylim=c(60, 75), projection = "Lambert")
       # Set up a Lambert plot.

       geolines(c(66, 66), c(-30, -10), nx = 50, col = 155, lwd = 2)
       # Draw a line with colour 155 and width 2.

       geopolygon(island)
       geolines(island, col = 3, lwd = 3)
       geolines(eyjar, col = 40)
       geolines(faeroes, col = 40)
       geolines(greenland, col = 3, lwd = 3)
#       geolines(janmayen, col = 40)
       # Plot some more countries using geolines.