mapCoordinateSystem {oce} | R Documentation |
Draws arrows on a map to indicate a coordinate system, e.g. for an to indicate a coordinate system set up so that one axis is parallel to a coastline.
mapCoordinateSystem(longitude, latitude, L = 100, phi = 0, ...)
longitude |
numeric value of longiutde in degrees. |
latitude |
numeric value of latitude in degrees. |
L |
axis length in km. |
phi |
angle, in degrees counterclockwise, that the "x" axis makes to a line of latitude. |
... |
plotting arguments, passed to |
This is a preliminary version of this function. It only works if the lines of constant latitude are horizontal on the plot.
Chantelle Layton
## Not run: library(oce) data(coastlineWorldFine, package='ocedata') HfxLon <- -63.5752 HfxLat <- 44.6488 mapPlot(coastlineWorldFine, proj='+proj=merc', longitudelim=HfxLon+c(-2,2), latitudelim=HfxLat+c(-2,2), col='lightgrey') mapCoordinateSystem(HfxLon, HfxLat, phi=45, length=0.05) ## End(Not run)