oce (version 0.9-5)

mapPlot: Plot a map

Description

Plot a map

Usage

mapPlot(longitude, latitude, longitudelim, latitudelim, grid,
       projection="mercator", parameters=NULL, orientation=NULL,
       ...)

Arguments

longitude

longitudes of points to be plotted, or a coastline object from which longitude and latitude are to be taken (see e.g. read.coastline).

latitude

latitudes of points to be plotted

longitudelim

optional limit of longitudes to plot

latitudelim

optional limit of latitudes to plot

grid

if TRUE, draw an auto-scaled lat-lon grid; if a number, draw a grid with the indicated spacing, in degrees.

projection

projection; see mapproject.

parameters

parameters for projection; see mapproject.

orientation

orientation for projection; see mapproject.

...

optional arguments passed to plotting functions.

Details

Creates a map using the indicated projection.

References

Snyder, John P., 1987. Map Projections: A Working Manual. USGS Professional Paper: 1395 (available at pubs.usgs.gov/pp/1395/report.pdf).

See Also

Points may be added to a map with mapPoints, lines may be added with mapLines, and text with mapText.

Examples

library(oce)
data(coastlineWorld)
longitude <- coastlineWorld[['longitude']]
latitude <- coastlineWorld[['latitude']]
mapPlot(longitude, latitude, type='l',
        latitudelim=c(0,120), longitudelim=c(-80,10),
        grid=10,
        projection="orthographic", orientation=c(45,-100,0))

## Illustrate the Lambert conformal conic projection,
## said by Snyder (page 34) to be suitable for regions
## of large east-west extent away from the equator.
## Here, show USA and Canada.
mapPlot(coastlineWorld, type='l',
        latitudelim=c(30,60), longitudelim=c(-130,-50),
        proj="lambert",
        parameters=c(lat0=40,lat1=60),
        orientation=c(90,-90,0), grid=TRUE)

## Similar looking map, with the polyconic projection
mapPlot(coastlineWorld, type='l',
        latitudelim=c(30,60), longitudelim=c(-130,-50),
        proj="polyconic", orientation=c(90, -90,0), grid=TRUE)