I am using the usmaps() package in R to create a map of the US. I have data set up like so:

Ces_State_Only:

I want to create a chloropleth map. I would like to bin my data into the following: 0-0.2, 0.2-0.25, 0.25-0.3, 0.3-0.33, 0.33-36, >36.

My code is:

plot_usmap(data = Ces_State_only, values = "1990")     scale_colour_gradientn(colours = "Blues", breaks = c(0,.2, .25, 0.3, 0.33, 0.36, 1),limits = c(0, 100))

This code works, but it does not bin my data.

I also tried binning my data before mapping it:

Ces_State_only$Ninety_bin <- cut(Ces_State_only$`1990`,breaks = c(0,0.2, 0.25, 0.3, 0.33, 0.36,1))
    
plot_usmap(data = Ces_State_only, values = "Ninety_bin")     scale_fill_brewer(palette="Blues",
        aesthetics = "fill",
        na.value = "grey50")    theme(legend.position = "right")

However, this creates only three different colors on the US Map (for the following bins: 0-0.2, 0.2-0.25, and 0.25-0.3).

Any suggestions or ideas?

Thank you in advance!

CodePudding user response：

The issue is that by default usused factor levels get dropped. You could prevent that by setting drop=FALSE in scale_fill_brewer:

library(usmap)
library(ggplot2)

plot_usmap(data = Ces_State_only, values = "Ninety_bin")  
  scale_fill_brewer(
    palette = "Blues",
    aesthetics = "fill",
    na.value = "grey50",
    drop = FALSE
  )  
  theme(legend.position = "right")