mapLongitudeLatitudeXY: Convert From Longitude and Latitude to X and Y

In oce: Analysis of Oceanographic Data

Convert From Longitude and Latitude to X and Y

Description

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.

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(), oceProject(), 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)

oce documentation built on Sept. 11, 2024, 7:09 p.m.