oce (version 0.1-81)

plot.coastline: Plot a coastline

Description

Plot a coastline.

Usage

## S3 method for class 'coastline':
plot(x,
     asp,
     center, span,
     mgp=getOption("oce.mgp"), 
     mar=c(mgp[1]+1,mgp[1]+1,1,1),
     bg,
     axes=TRUE,
     expand=1.5,
     debug=getOption("oce.debug"),
     ...)

Arguments

x

A coastline object, as read by read.coastline or created by as.coastline, or a list containing items named latitud

asp

Aspect ratio for plot. The default is for plot.coastline to set the aspect ratio to give natural latitude-longitude scaling somewhere near the centre latitude on the plot. Often, it makes sense to set asp yourself, e

center

optional center of map, a vector containing latitude in degrees north, then longitude in degrees east. (Must be accompanied by span.)

span

optional suggested span of plot, in kilometers (must be supplied, if center is supplied).

mgp

3-element numerical vector to use for par(mgp), and also for par(mar), computed from this. The default is tighter than the R default, in order to use more space for the data and less for the axes.

mar

value to be used with par("mar").

bg

optional colour to be used for the background of the map. This comes in handy for drawing insets (see details).

axes

boolean, set to TRUE to plot axes.

expand

numerical factor for the expansion of plot limits, showing area outside the plot, e.g. if showing a ship track as a coastline, and then an actual coastline to show the ocean boundary. The value of expand is ignored if either

debug

set to TRUE to get debugging information during processing.

...

optional arguments passed to plotting functions. For example, set yaxp=c(-90,90,4) for a plot extending from pole to pole.

Value

• None.

Details

This function plots a coastline. An attempt is made to fill the space of the plot, and this is done by limiting either the longitude range or the latitude range, as appropriate, by modifying the eastern or northern limit, as appropriate.

To get an inset map inside another map, draw the first map, do par(new=TRUE), and then call plot.coastline with a value of mar that moves the inset plot to a desired location on the existing plot, and with bg="white".

See Also

read.coastline can read coastlines from data files, provided that they are in a certain class of formats. A coastline may be summarized by summary.coastline.

Examples

library(oce)
data(coastline.world)
plot(coastline.world)