Add NA value to ggplot legend for continuous data map

Question

I\'m using ggplot to map data values to a (fortified) SpatialPolygonsDataFrame, but many of the polygons have NA values because there is no data available.

I used na.va

Answer 1

Try this:

ggplot(all your info) + geom_point(na.rm = TRUE) + geom_line(na.rm = TRUE)