mapScalebar {oce} | R Documentation |
Draw a scalebar on an existing map.
mapScalebar(x, y = NULL, length, lwd = 1.5 * par("lwd"), cex = par("cex"), col = "black")
x, y |
position of the scalebar. Eventually this may be similar to
the corresponding arguments in |
length |
the distance to indicate, in kilometres. If not provided, a reasonable choice is made, based on the underlying map. |
lwd |
line width of the scalebar. |
cex |
character expansion factor for the scalebar text. |
col |
colour of the scalebar. |
The scale is appropriate to the centre of the plot, and will become increasingly inaccurate away from that spot, with the error depending on the projection and the fraction of the earth that is shown.
Dan Kelley
A map must first have been created with mapPlot
.
Other functions related to maps: lonlat2map
,
lonlat2utm
, map2lonlat
,
mapArrows
, mapAxis
,
mapContour
,
mapDirectionField
, mapGrid
,
mapImage
, mapLines
,
mapLocator
,
mapLongitudeLatitudeXY
,
mapPlot
, mapPoints
,
mapPolygon
, mapText
,
mapTissot
, oceCRS
,
shiftLongitude
, utm2lonlat
## Not run: library(oce) data(coastlineWorld) ## Arctic Ocean par(mar=c(2.5, 2.5, 1, 1)) mapPlot(coastlineWorld, latitudelim=c(60, 120), longitudelim=c(-130,-50), col="lightgray", projection="+proj=stere +lat_0=90") mapScalebar() ## End(Not run)