CODEWITHSUNDEEP
rtmap
Marco Maurer
Marco Maurer

Reputation: 13

Specifying colors in tmap for different classes R

I am trying to create a map that shows diverging values. I tried to set the breaks but somehow the different classes don't show different colours (click here for the map). The output map always has the same colour for several classes.

tm_shape(abm_population)+ tm_fill("diff_rel_growth",breaks=c(min(abm_population$diff_rel_growth,na.rm = T),-0.5,-0.3,-0.1,0.1,0.3,0.5,max(abm_population$diff_rel_growth,na.rm = T)))

What am I missing or doing wrong?

Upvotes: 0

Views: 2322

Answers (1)

Orlando Sabogal
Orlando Sabogal

Reputation: 1630

It is difficult to privde a full answer given that, even though you provide the code, t is difficult to reproduce your issue.

Neverheless, my feeling is that your code is working properly. It seems like your problem is more related to the way you are defining the classes. Notice that you have one giant category ranging from 0.50 to 61.93 (This category seems the one with more polygons).

One first step is tho double check your data. Then, see if you can define a different set of breaks.

Finally, you can also control the colors:

nc = st_read(system.file("shape/nc.shp", package="sf"))
Breaks <- c(0, 2000, 4000, 6000, 31000)
Labels <- c("0 - 2000", "2000 - 4000", "4000 - 6000", ">6000")
MyPalette <- c("#f2f0f7", "#cbc9e2", "#9e9ac8", "#6a51a3")

tm_shape(nc) + tm_polygons(col="BIR79", title = "Births 1979 - 84", 
                           palette = MyPalette,
                           breaks = Breaks, labels = Labels) + 
tm_layout(legend.position = c(0.01,0.65),
          scale=0.65,
          legend.frame = T,
          bg.color = "lightblue") + 
tm_compass(size = 5, type = "rose", lwd = 3) + 
tm_scale_bar(breaks = c(0,50,100,150,200),size = 1, position = c(0.06,0),
             lwd = 3)

Upvotes: 1

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