gridlinesWrap function

Adds long-lat grid for projected data

long-lat grid lines are added to a map in the coordinate system specified, allowing for map projections wrapped differently from the 180 meridian.

gridlinesWrap(crs, 
                easts=seq(-180,180,by=60),
                norths=seq(-90,90,by=30),
                ndiscr=40, plotLines=TRUE, 
                plotLabels = TRUE, ...)

Arguments

• crs: A character string representing a CRS
• easts: vector of longitudes
• norths: vector of latitudes
• ndiscr: number of intermediate points per line
• plotLines: add lines to existing plot
• plotLabels: add labels to existing plot
• ...: Additional arguments passed to lines or text, for example lty=2

Returns

A list with elements lines, containg the graticule lines, and points containing the locations and labels for longitude and latitude values.

Author(s)

Patrick Brown

See Also

graticule

Examples

data('worldMap')
worldMap = terra::unwrap(worldMap)
crsMoll = moll(-100)
worldMapT = wrapPoly(worldMap, crsMoll, buffer.width=200*1000)

plot(attributes(crsMoll)$ellipse)
plot(worldMapT, add=TRUE)
gridlinesWrap(crsMoll, lty=3, col='red', cex=0.6)