plot Brazilian metropolitan areas in different years

metro_areas_brazil_geobr.md

Using R and the geobr package to plot Brazilian metropolitan areas in different years.

library(geobr)
library(dplyr)
library(ggplot2)
library(sf)
library(ggthemes)


# download sf of Brazilian states
  states <- read_state(code_state = 'all')


# download metro areas sf and pille them up
  download_metro <- function(y){
    tmp <- read_metro_area(year = y) %>% select(name_metro, abbrev_state)
    tmp$year <- y
    return(tmp)
  }

  metros_sf <- lapply(X= c(1970, 2001, 2018), FUN=download_metro) %>% do.call('rbind', .)


# plot
  temp_lot <- ggplot() +
                geom_sf(data=states, color="gray90", fill="gray80", size=.4) +
                geom_sf(data=metros_sf, aes(color=as.factor(name_metro), fill=as.factor(name_metro)), show.legend = FALSE) +
                facet_wrap(~year, nrow = 1) +
                theme_map() +
                theme( strip.background = element_rect(colour = "white", fill = "white"),
                       strip.text.x = element_text(size = 8, face ="bold"))

# save plot
  ggsave(temp_lot, file= "geobr_metros_1970-2001-2018.png", dpi = 300, width = 15, height = 6, units = "cm")

Is all of SC a metro area??

Hi Carl. No, and in fact Santa Catarina had 11 different metro areas in 2018 covering the whole state Rafael H.M. Pereira

…

On 3 Jan 2020, at 19:13, Carl Schmertmann ***@***.***> wrote: Is all of SC a metro area?? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub, or unsubscribe.

Does this work with geobr 1.1, or only with a new version? (I tried running the code above, in order to later modify it and look at SC in detail, but with the script above I'm getting "could not find function read_metro_area". )

Hi Carl. It doesn't work with geobr 1.1. The fuction read_metro_area() is in the dev version. If you'd like to test geobr 1.2 (rev), you need to reinstall it:

  utils::remove.packages('geobr')
  devtools::install_github("ipeaGIT/geobr", subdir = "r-package")
  library(geobr)

Thanks, Rafa. It worked after (1) removing the old version, then (2) installing the dev version.

The sub-areas within metros are municípios?

I'm glad to hear it worked! Yes, the function returns the shapes of municipalities grouped by their respective metro areas.

Yeah, I think this was a re-run of an earlier conversation that we had. I know to check by installing the dev version, but apparently that doesn't work (at least on my machine) until the CRAN version is uninstalled. Thanks again for the great work on geobr.

Thank you for all the support, Carl !

Hi, I'm new in R programming and I'm trying to plotting your code, I installed all the packages it shows as library, but it get an error in the "geometry". I just copy and paste your code but it don't work, can you help?

Hi, I'm new in R programming and I'm trying to plotting your code, I installed all the packages it shows as library, but it get an error in the "geometry". I just copy and paste your code but it don't work, can you help?

There was a small error in the code. I've removed the word geometry from line 14. It should work now.

Sorry for bothering you but it says Erro: package ‘digest’ does not have a namespace** I am doing something wrong?