customize legend in ggplot2 with sf objects












2














I am plotting (mapping) sf objects with ggplot2. My understanding is that since version 2.2.1 ggplot2 contains the geom geom_sf, for simple feature objects.



I can produce the exact map that I want by doing the following:



library(sf)
library(ggplot2)

# some points to start with
a <- st_as_sf(data.frame(lon = c(1,4,6), lat = c(0,0,-3)), coords = c('lon', 'lat'))
b <- st_as_sf(data.frame(lon = c(2.5,4), lat = c(-4.5,-5)), coords = c('lon', 'lat'))

# circles around those points
buf.a <- st_buffer(a, 1)
buf.b <- st_buffer(b, 1)

# colors to mark the points
sol.a = rgb(1,0,0)
sol.b = rgb(0,0,1)

# colors to fill the circles
fil.a = adjustcolor(sol.a, alpha.f = .25)
fil.b = adjustcolor(sol.b, alpha.f = .25)

# the plot I want
g = ggplot() +
geom_sf(data = buf.a, fill = fil.a, color = NA) +
geom_sf(data = buf.b, fill = fil.b, color = NA) +
geom_sf(data = a, color = sol.a, shape = 20, size = 3) +
geom_sf(data = b, color = sol.b, shape = 20, size = 3)
g


which produces



enter image description here



This is what I want except that it is missing a legend. For that, I am doing



cols.fill = c("GROUP A" = fil.a, "GROUP B" = fil.b)
cols.sol = c("GROUP A" = sol.a, "GROUP B" = sol.b)

g = ggplot() +
geom_sf(data = buf.a, color = NA, aes(fill = 'GROUP A')) +
geom_sf(data = buf.b, color = NA, aes(fill = 'GROUP B')) +
geom_sf(data = a, shape = 20, size = 3, aes(color = 'GROUP A')) +
geom_sf(data = b, shape = 20, size = 3, aes(color = 'GROUP B')) +
scale_fill_manual(name = "circles", values = cols.fill) +
scale_color_manual(name = "points", values = cols.sol)
g


which gives



enter image description here



That's not what I want, because in the legend:




  1. 'points' should be points (not squares); and

  2. 'circles' should be, well, circles (again, not squares)


Would be nice if the legend could respect the transparency of my colors (which it did in this example).



I tried to change the last couple of lines of the above to something like



scale_fill_manual(name = "circles", values = cols.fill,
guide = guide_legend(override.aes = list(shape = c(19, 19)))) +
scale_color_manual(name = "points", values = cols.sol,
guide = guide_legend(override.aes = list(shape = c(20, 20))))


but that didn't do anything to my plot.



Ideas?



Note: If it ends up being simpler for the plot, I could change the structure of the data, e.g., by combining objects a and b in the same simple feature object and add a column indicating the group (same for buf.a and buf.b).










share|improve this question



























    2














    I am plotting (mapping) sf objects with ggplot2. My understanding is that since version 2.2.1 ggplot2 contains the geom geom_sf, for simple feature objects.



    I can produce the exact map that I want by doing the following:



    library(sf)
    library(ggplot2)

    # some points to start with
    a <- st_as_sf(data.frame(lon = c(1,4,6), lat = c(0,0,-3)), coords = c('lon', 'lat'))
    b <- st_as_sf(data.frame(lon = c(2.5,4), lat = c(-4.5,-5)), coords = c('lon', 'lat'))

    # circles around those points
    buf.a <- st_buffer(a, 1)
    buf.b <- st_buffer(b, 1)

    # colors to mark the points
    sol.a = rgb(1,0,0)
    sol.b = rgb(0,0,1)

    # colors to fill the circles
    fil.a = adjustcolor(sol.a, alpha.f = .25)
    fil.b = adjustcolor(sol.b, alpha.f = .25)

    # the plot I want
    g = ggplot() +
    geom_sf(data = buf.a, fill = fil.a, color = NA) +
    geom_sf(data = buf.b, fill = fil.b, color = NA) +
    geom_sf(data = a, color = sol.a, shape = 20, size = 3) +
    geom_sf(data = b, color = sol.b, shape = 20, size = 3)
    g


    which produces



    enter image description here



    This is what I want except that it is missing a legend. For that, I am doing



    cols.fill = c("GROUP A" = fil.a, "GROUP B" = fil.b)
    cols.sol = c("GROUP A" = sol.a, "GROUP B" = sol.b)

    g = ggplot() +
    geom_sf(data = buf.a, color = NA, aes(fill = 'GROUP A')) +
    geom_sf(data = buf.b, color = NA, aes(fill = 'GROUP B')) +
    geom_sf(data = a, shape = 20, size = 3, aes(color = 'GROUP A')) +
    geom_sf(data = b, shape = 20, size = 3, aes(color = 'GROUP B')) +
    scale_fill_manual(name = "circles", values = cols.fill) +
    scale_color_manual(name = "points", values = cols.sol)
    g


    which gives



    enter image description here



    That's not what I want, because in the legend:




    1. 'points' should be points (not squares); and

    2. 'circles' should be, well, circles (again, not squares)


    Would be nice if the legend could respect the transparency of my colors (which it did in this example).



    I tried to change the last couple of lines of the above to something like



    scale_fill_manual(name = "circles", values = cols.fill,
    guide = guide_legend(override.aes = list(shape = c(19, 19)))) +
    scale_color_manual(name = "points", values = cols.sol,
    guide = guide_legend(override.aes = list(shape = c(20, 20))))


    but that didn't do anything to my plot.



    Ideas?



    Note: If it ends up being simpler for the plot, I could change the structure of the data, e.g., by combining objects a and b in the same simple feature object and add a column indicating the group (same for buf.a and buf.b).










    share|improve this question

























      2












      2








      2


      1





      I am plotting (mapping) sf objects with ggplot2. My understanding is that since version 2.2.1 ggplot2 contains the geom geom_sf, for simple feature objects.



      I can produce the exact map that I want by doing the following:



      library(sf)
      library(ggplot2)

      # some points to start with
      a <- st_as_sf(data.frame(lon = c(1,4,6), lat = c(0,0,-3)), coords = c('lon', 'lat'))
      b <- st_as_sf(data.frame(lon = c(2.5,4), lat = c(-4.5,-5)), coords = c('lon', 'lat'))

      # circles around those points
      buf.a <- st_buffer(a, 1)
      buf.b <- st_buffer(b, 1)

      # colors to mark the points
      sol.a = rgb(1,0,0)
      sol.b = rgb(0,0,1)

      # colors to fill the circles
      fil.a = adjustcolor(sol.a, alpha.f = .25)
      fil.b = adjustcolor(sol.b, alpha.f = .25)

      # the plot I want
      g = ggplot() +
      geom_sf(data = buf.a, fill = fil.a, color = NA) +
      geom_sf(data = buf.b, fill = fil.b, color = NA) +
      geom_sf(data = a, color = sol.a, shape = 20, size = 3) +
      geom_sf(data = b, color = sol.b, shape = 20, size = 3)
      g


      which produces



      enter image description here



      This is what I want except that it is missing a legend. For that, I am doing



      cols.fill = c("GROUP A" = fil.a, "GROUP B" = fil.b)
      cols.sol = c("GROUP A" = sol.a, "GROUP B" = sol.b)

      g = ggplot() +
      geom_sf(data = buf.a, color = NA, aes(fill = 'GROUP A')) +
      geom_sf(data = buf.b, color = NA, aes(fill = 'GROUP B')) +
      geom_sf(data = a, shape = 20, size = 3, aes(color = 'GROUP A')) +
      geom_sf(data = b, shape = 20, size = 3, aes(color = 'GROUP B')) +
      scale_fill_manual(name = "circles", values = cols.fill) +
      scale_color_manual(name = "points", values = cols.sol)
      g


      which gives



      enter image description here



      That's not what I want, because in the legend:




      1. 'points' should be points (not squares); and

      2. 'circles' should be, well, circles (again, not squares)


      Would be nice if the legend could respect the transparency of my colors (which it did in this example).



      I tried to change the last couple of lines of the above to something like



      scale_fill_manual(name = "circles", values = cols.fill,
      guide = guide_legend(override.aes = list(shape = c(19, 19)))) +
      scale_color_manual(name = "points", values = cols.sol,
      guide = guide_legend(override.aes = list(shape = c(20, 20))))


      but that didn't do anything to my plot.



      Ideas?



      Note: If it ends up being simpler for the plot, I could change the structure of the data, e.g., by combining objects a and b in the same simple feature object and add a column indicating the group (same for buf.a and buf.b).










      share|improve this question













      I am plotting (mapping) sf objects with ggplot2. My understanding is that since version 2.2.1 ggplot2 contains the geom geom_sf, for simple feature objects.



      I can produce the exact map that I want by doing the following:



      library(sf)
      library(ggplot2)

      # some points to start with
      a <- st_as_sf(data.frame(lon = c(1,4,6), lat = c(0,0,-3)), coords = c('lon', 'lat'))
      b <- st_as_sf(data.frame(lon = c(2.5,4), lat = c(-4.5,-5)), coords = c('lon', 'lat'))

      # circles around those points
      buf.a <- st_buffer(a, 1)
      buf.b <- st_buffer(b, 1)

      # colors to mark the points
      sol.a = rgb(1,0,0)
      sol.b = rgb(0,0,1)

      # colors to fill the circles
      fil.a = adjustcolor(sol.a, alpha.f = .25)
      fil.b = adjustcolor(sol.b, alpha.f = .25)

      # the plot I want
      g = ggplot() +
      geom_sf(data = buf.a, fill = fil.a, color = NA) +
      geom_sf(data = buf.b, fill = fil.b, color = NA) +
      geom_sf(data = a, color = sol.a, shape = 20, size = 3) +
      geom_sf(data = b, color = sol.b, shape = 20, size = 3)
      g


      which produces



      enter image description here



      This is what I want except that it is missing a legend. For that, I am doing



      cols.fill = c("GROUP A" = fil.a, "GROUP B" = fil.b)
      cols.sol = c("GROUP A" = sol.a, "GROUP B" = sol.b)

      g = ggplot() +
      geom_sf(data = buf.a, color = NA, aes(fill = 'GROUP A')) +
      geom_sf(data = buf.b, color = NA, aes(fill = 'GROUP B')) +
      geom_sf(data = a, shape = 20, size = 3, aes(color = 'GROUP A')) +
      geom_sf(data = b, shape = 20, size = 3, aes(color = 'GROUP B')) +
      scale_fill_manual(name = "circles", values = cols.fill) +
      scale_color_manual(name = "points", values = cols.sol)
      g


      which gives



      enter image description here



      That's not what I want, because in the legend:




      1. 'points' should be points (not squares); and

      2. 'circles' should be, well, circles (again, not squares)


      Would be nice if the legend could respect the transparency of my colors (which it did in this example).



      I tried to change the last couple of lines of the above to something like



      scale_fill_manual(name = "circles", values = cols.fill,
      guide = guide_legend(override.aes = list(shape = c(19, 19)))) +
      scale_color_manual(name = "points", values = cols.sol,
      guide = guide_legend(override.aes = list(shape = c(20, 20))))


      but that didn't do anything to my plot.



      Ideas?



      Note: If it ends up being simpler for the plot, I could change the structure of the data, e.g., by combining objects a and b in the same simple feature object and add a column indicating the group (same for buf.a and buf.b).







      r ggplot2 sf






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Nov 13 '18 at 3:16









      djas

      536218




      536218
























          1 Answer
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          oldest

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          0














          Here's how far I managed to get to.



          g = ggplot() +
          geom_sf(data = buf.a, color = NA, aes(fill = 'GROUP A'), show.legend = "point") +
          geom_sf(data = buf.b, color = NA, aes(fill = 'GROUP B'), show.legend = "point") +
          geom_sf(data = a, shape = 20, size = 3, aes(color = 'GROUP A'), show.legend = "point") +
          geom_sf(data = b, shape = 20, size = 3, aes(color = 'GROUP B'), show.legend = "point") +
          scale_color_manual(name = "points", values = cols.sol,
          guide = guide_legend(override.aes = list(shape = c(20, 20)))) +
          scale_fill_manual(name = "circles", values = cols.fill,
          guide = guide_legend(override.aes = list(shape = c(20, 20), color = cols.fill, size = 8)))
          g


          enter image description here



          To get rid of the gray background in the legend symbols,



          g + theme(legend.key = element_rect(fill = "white"))


          enter image description here



          The only issue here is that the circles do not have the transparency I wanted. This is odd.






          share|improve this answer





















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            1 Answer
            1






            active

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            active

            oldest

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            active

            oldest

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            0














            Here's how far I managed to get to.



            g = ggplot() +
            geom_sf(data = buf.a, color = NA, aes(fill = 'GROUP A'), show.legend = "point") +
            geom_sf(data = buf.b, color = NA, aes(fill = 'GROUP B'), show.legend = "point") +
            geom_sf(data = a, shape = 20, size = 3, aes(color = 'GROUP A'), show.legend = "point") +
            geom_sf(data = b, shape = 20, size = 3, aes(color = 'GROUP B'), show.legend = "point") +
            scale_color_manual(name = "points", values = cols.sol,
            guide = guide_legend(override.aes = list(shape = c(20, 20)))) +
            scale_fill_manual(name = "circles", values = cols.fill,
            guide = guide_legend(override.aes = list(shape = c(20, 20), color = cols.fill, size = 8)))
            g


            enter image description here



            To get rid of the gray background in the legend symbols,



            g + theme(legend.key = element_rect(fill = "white"))


            enter image description here



            The only issue here is that the circles do not have the transparency I wanted. This is odd.






            share|improve this answer


























              0














              Here's how far I managed to get to.



              g = ggplot() +
              geom_sf(data = buf.a, color = NA, aes(fill = 'GROUP A'), show.legend = "point") +
              geom_sf(data = buf.b, color = NA, aes(fill = 'GROUP B'), show.legend = "point") +
              geom_sf(data = a, shape = 20, size = 3, aes(color = 'GROUP A'), show.legend = "point") +
              geom_sf(data = b, shape = 20, size = 3, aes(color = 'GROUP B'), show.legend = "point") +
              scale_color_manual(name = "points", values = cols.sol,
              guide = guide_legend(override.aes = list(shape = c(20, 20)))) +
              scale_fill_manual(name = "circles", values = cols.fill,
              guide = guide_legend(override.aes = list(shape = c(20, 20), color = cols.fill, size = 8)))
              g


              enter image description here



              To get rid of the gray background in the legend symbols,



              g + theme(legend.key = element_rect(fill = "white"))


              enter image description here



              The only issue here is that the circles do not have the transparency I wanted. This is odd.






              share|improve this answer
























                0












                0








                0






                Here's how far I managed to get to.



                g = ggplot() +
                geom_sf(data = buf.a, color = NA, aes(fill = 'GROUP A'), show.legend = "point") +
                geom_sf(data = buf.b, color = NA, aes(fill = 'GROUP B'), show.legend = "point") +
                geom_sf(data = a, shape = 20, size = 3, aes(color = 'GROUP A'), show.legend = "point") +
                geom_sf(data = b, shape = 20, size = 3, aes(color = 'GROUP B'), show.legend = "point") +
                scale_color_manual(name = "points", values = cols.sol,
                guide = guide_legend(override.aes = list(shape = c(20, 20)))) +
                scale_fill_manual(name = "circles", values = cols.fill,
                guide = guide_legend(override.aes = list(shape = c(20, 20), color = cols.fill, size = 8)))
                g


                enter image description here



                To get rid of the gray background in the legend symbols,



                g + theme(legend.key = element_rect(fill = "white"))


                enter image description here



                The only issue here is that the circles do not have the transparency I wanted. This is odd.






                share|improve this answer












                Here's how far I managed to get to.



                g = ggplot() +
                geom_sf(data = buf.a, color = NA, aes(fill = 'GROUP A'), show.legend = "point") +
                geom_sf(data = buf.b, color = NA, aes(fill = 'GROUP B'), show.legend = "point") +
                geom_sf(data = a, shape = 20, size = 3, aes(color = 'GROUP A'), show.legend = "point") +
                geom_sf(data = b, shape = 20, size = 3, aes(color = 'GROUP B'), show.legend = "point") +
                scale_color_manual(name = "points", values = cols.sol,
                guide = guide_legend(override.aes = list(shape = c(20, 20)))) +
                scale_fill_manual(name = "circles", values = cols.fill,
                guide = guide_legend(override.aes = list(shape = c(20, 20), color = cols.fill, size = 8)))
                g


                enter image description here



                To get rid of the gray background in the legend symbols,



                g + theme(legend.key = element_rect(fill = "white"))


                enter image description here



                The only issue here is that the circles do not have the transparency I wanted. This is odd.







                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Nov 15 '18 at 22:13









                djas

                536218




                536218






























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