| 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 |
numeric 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 |
latitude |
numeric 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)