Convert From Longitude and Latitude to X and Y

Find (x, y) values corresponding to (longitude, latitude) values, using the present projection. This is mainly a wrapper around lonlat2map().

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 mapLocator()), in which case the following two arguments are ignored.

latitude

numeric vector of latitudes of points, needed only if they cannot be inferred from the first argument.

Value

A list containing x and y.

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(), oceProject(), shiftLongitude(), usrLonLat(), utm2lonlat()

Author

Dan Kelley

Examples

# \donttest{
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)

# }