Sets the region, aspect and ocean colour for a new map plot
rwmNewMapPlot(mapToPlot = getMap(), oceanCol = NA, mapRegion = "world",
xlim = NA, ylim = NA, aspect = 1)
a dataframe containing xlim and ylim
the worldmap to be plotted
a colour for the ocean
a string specifying the map region, see setMapExtents()
map extents c(west,east), can be overidden by mapRegion
map extents c(south,north), can be overidden by mapRegion
aspect for the map, defaults to 1, if set to 'variable' uses same default as plot.Spatial in sp
andy south
Called by mapCountryData() and mapGriddedData()