如何在 R 中手动更改 tmap 中的连续比例颜色

Question

How can I manually determine the colors on a continuous scale in tmap?

For example, I am working with a map similar to the one below:

data(World)
World$gdp_cap_est2 <- World$gdp_cap_est -100000
tm_shape(World) + tm_polygons(col="gdp_cap_est2",
                              style = "cont")
                                       

I'd like the color to be red for negative values, I'd like the color to be white at and around zero, and I'd like the color to be blue for positive values.

Thank you so much for the help!

Answer 1

Use tmaptools::palette_explorer() to find the correct palette.

palette = "RdBu" is the most appropriate.

data(World)
World$gdp_cap_est2 <- World$gdp_cap_est -100000
tm_shape(World) + tm_polygons(col="gdp_cap_est2",
                              style = "cont",
                              palette = "RdBu")