sl.plot.lonlatlabels: Plot Longitude-Latitude Labels
In helgegoessling/spheRlab: Spherical Geometry, Analysis, and Plotting of Geoscientific Data on Arbitrary Grids

sl.plot.lonlatlabels

R Documentation

Plot Longitude-Latitude Labels

Description

Plot longitude and latitude labels over a spheRlab plot.

Usage

sl.plot.lonlatlabels(plot.init.res, lat.lons = NULL, lat.lats = NULL, lon.lons = NULL, lon.lats = NULL, col = "grey", cex = 1)

Arguments

`plot.init.res`	a spheRlab plot specifics list as returned by `sl.plot.init` (or a variant thereof).
`lat.lons`	a numeric vector specifying at which longitudes (degrees east) latitude labels are to be drawn.
`lat.lats`	a numeric vector specifying at which latitudes (degrees north) latitude labels are to be drawn.
`lat.offsetlatlon`	a 2-element numeric vector specifying the degrees latitude and longitude by which latitude labels are to be shifted.
`lon.lons`	a numeric vector specifying at which longitudes (degrees east) longitude labels are to be drawn.
`lon.lats`	a numeric vector specifying at which latitudes (degrees north) longitude labels are to be drawn.
`lon.offsetlatlon`	a 2-element numeric vector specifying the degrees latitude and longitude by which longitude labels are to be shifted.
`col`	the color to be used for the labels.
`cex`	numeric character expansion factor for the labels; multiplied by `par("cex")` yields the final character size. `NULL` and `NA` are equivalent to `1.0`.

Note

This function is used by sl.plot.lonlatgrid if labels=TRUE is set in that function, with a simple way to determine the placement of labels automatically and with few arguments to control the behaviour. For more flexibility, this function can be used directly.