When I run this code
library(rworldmap)
data("coastsCoarse")
plot(coastsCoarse)
RobinsonProj <- "+proj=robin +lon_0=0 +x_0=0 +y_0=0 +ellps=WGS84 +datum=WGS84 +units=m +no_defs"
crsLoc <- CRS(RobinsonProj)
coastsCoarse <- sp::spTransform(coastsCoarse, crsLoc)
plot(coastsCoarse)
I get one plot that looks like the coasts of the continents. The second plot, after projecting into Robinson returns a horizontal line across the top of the plot of the continents and the following warning.
Warning message: In spTransform(xSP, CRSobj, ...) : NULL source CRS comment, falling back to PROJ string
How do I get rid of that line in the projected version. Extra credit for an explanation of how to get rid of Antarctica.