Convert From Longitude and Latitude to X and Y — mapLongitudeLatitudeXY • oce

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

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)

# }