R: Convert From Longitude and Latitude to X and Y

mapLongitudeLatitudeXY {oce} | R Documentation

## Convert From Longitude and Latitude to X and Y

### Description

Find (x, y) values corresponding to (longitude, latitude) values, using the present projection.

### Usage

    mapLongitudeLatitudeXY(longitude, latitude)

### Arguments

`longitude` | vector of the longitudes of points, or an object from which both latitude and longitude can be inferred (e.g. a coastline file, or the return value from `mapLocator()`), in which case the following two arguments are ignored.
`latitude` | vector of latitudes of points, needed only if they cannot be inferred from the first argument.

### Details

This is mainly a wrapper around `lonlat2map()`.

### Value

A list containing `x` and `y`.

### Author(s)

Dan Kelley

### See Also

A map must first have been created with `mapPlot()`.

Other functions related to maps: `formatPosition()`, `lonlat2map()`, `lonlat2utm()`, `map2lonlat()`, `mapArrows()`, `mapAxis()`, `mapContour()`, `mapCoordinateSystem()`, `mapDirectionField()`, `mapGrid()`, `mapImage()`, `mapLines()`, `mapLocator()`, `mapPlot()`, `mapPoints()`, `mapPolygon()`, `mapScalebar()`, `mapText()`, `mapTissot()`, `oceCRS()`, `shiftLongitude()`, `usrLonLat()`, `utm2lonlat()`

### Examples

    library(oce)
    data(coastlineWorld)
    par(mfrow=c(2, 1), mar=rep(2, 4))
    mapPlot(coastlineWorld, projection="+proj=moll") # sets a projection
    xy <- mapLongitudeLatitudeXY(coastlineWorld)
    plot(xy, type='l', asp=1)

[Package oce version 1.2-0 Index]