oce (version 0.9-13)

mapMeridians: Plot meridians on an existing map

Description

Plot meridians (lines of constant latitude) on a existing map

Usage

mapMeridians(lat, lty='dotted', lwd=par('lwd'), col='lightgray', ...)

Arguments

lat

either a boolean indicating whether to draw a meridian grid, or a single number to indicate the increment in meridian latitudes, or a vector of latitudes at which to draw meridians.

lty

line type

lwd

line width

col

colour

...

optional arguments passed to lines.

Bugs

This should use approx to fill in multiple segments within the line, so that e.g. great circle lines will be curved.

Details

Meridians that will not fit in the plotting space are ignored.

See Also

See mapPlot for general information on plotting maps, including other functions.

Examples

library(oce)
data(coastlineWorld)
longitude <- coastlineWorld[['longitude']]
latitude <- coastlineWorld[['latitude']]
mapPlot(longitude, latitude, type='l',
        latitudelim=c(30,60), longitudelim=c(-130,-50),
        proj="polyconic", orientation=c(90, -90, 0))
mapMeridians()