How to manipulate tmap legend?

Question

I\'m creating a thematic map of percent change per year for bird species. here is the code I have:

tm_shape(grid83)+
  tm_fill(\"trend\", title = \"Percent chang         


        

Answer 1

So you are trying to change the color specifically for NA values? The colorNA argument to tm_fill() serves that purpose.

Here's an example:

library(tmap)
data(Europe)
tm_shape(Europe) +
tm_fill("gdp_cap_est", title = "GDP", style = "fixed",
        breaks = c(0, 10000, 20000, 30000, 40000, Inf),
        textNA = "Dunno", 
        colorNA = "green",   # <-------- color for NA values
        palette = c("red", "orange", "yellow", "turquoise", "blue", "white")) +
tm_borders() +
tm_layout("Wealth (or so)",
          legend.title.size = 1,
          legend.text.size = 0.6,
          legend.position = c("left","bottom"),
          legend.bg.color = "white",
          legend.digits = 5,
          legend.bg.alpha = 1)

It looks like this: