AddNorthArrow: Add North Arrow to Plot
In inlmisc: Miscellaneous Functions for the USGS INL Project Office

Description Usage Arguments Value Author(s) See Also Examples

Add a north arrow aligned to true north to a plot.

1	AddNorthArrow(crs = sp::CRS(), len = 0.05, lab = "N", rotate = 0, ...)

`crs`	'CRS', 'Raster*', or 'Spatial'. Coordinate reference system (CRS), or any object with a CRS attribute that can be extracted using the `crs` function. If missing (the default) the north arrow is point to the top of the plot unless the `rotate` argument is specified.
`len`	'numeric' number. Arrow length expressed as a fraction of the plot height, by default is 5-percent.
`lab`	'character' string. North label, by default is “N”.
`rotate`	'numeric' number. Arrow offset-rotation in degrees, where positive values are taken to be clockwise.
`...`	Additional arguments to be passed to the `GetInsetLocation` function—used to position the north arrow in the main plot region.

Invisible NULL

J.C. Fisher, U.S. Geological Survey, Idaho Water Science Center

PlotMap

m <- datasets::volcano
m <- m[nrow(m):1, ncol(m):1]
x <- seq(from = 2667405, length.out = ncol(m), by = 10)
y <- seq(from = 6478705, length.out = nrow(m), by = 10)
r <- raster::raster(m, xmn = min(x), xmx = max(x),
                    ymn = min(y), ymx = max(y),
                    crs = "+init=epsg:27200")
PlotMap(r, pal = GetColors(scheme = "DEM screen"))
AddNorthArrow(raster::crs(r), loc = "center")
AddNorthArrow(raster::crs(r), inset = 0.1)
AddNorthArrow(raster::crs(r), loc = "topleft", inset = 0.1)