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Mapping with R

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  1. Welcome to Mapping with R (01_01)
  2. Geospatial Data
    Making Maps is Complex (01_02)
  3. mapview for Quick Maps (01_03)
  4. sf for Simple Features (01_04)
  5. Turning Data Frames into sf Objects (01_05)
  6. Importing Shapefiles (01_06)
  7. Joining Geospatial Datasets (01_07)
  8. Disambiguating Country Names (01_08)
  9. Converting Addresses to Coordinates (01_09)
  10. U.S.-Specific Datasets (01_10)
  11. Advice on Finding International Datasets (01_11)
  12. CRS and Projections: Geographic and Projected CRS (01_12)
  13. CRS and Projections: How to Choose a CRS (01_13)
  14. Introducing Raster GIS with raster and stars (01_14)
  15. Basics of Using the raster Package (01_15)
  16. Static Maps
    ggplot2 Essentials (02_01)
  17. Starting a Map in ggplot2 (02_02)
  18. Labelling ggplot2 Maps (02_03)
  19. Compare Locations/Events with Geobubble Charts (02_04)
  20. Highlight a Region in a Country with ggplot2 (02_05)
  21. Make a Choropleth Map of Discrete Variables with ggplot2 (02_06)
  22. Make a Choropleth Map of Continuous Variables with ggplot2 (02_07)
  23. Faceting Choropleth Maps with ggplot2 (02_08)
  24. Visualize Raster Data with ggplot2 (02_09)
  25. Adding Scale Bars and North Arrows with ggplot2 (02_10)
  26. Interactive Maps
    What is leaflet? (03_01)
  27. Starting a Map in leaflet (03_02)
  28. Necessary HTML for Labelling leaflet Maps (03_03)
  29. Highlight a Region in a Country with leaflet (03_04)
  30. Compare Locations/Events with Geobubble Charts in leaflet (03_05)
  31. Make a Choropleth Map of Discrete Variables with leaflet (03_06)
  32. Make a Choropleth Map of Continuous Variables with leaflet (03_07)
  33. Visualize Raster Data with leaflet (03_08)
  34. Wrapping Up
    You Did It!
Mapping with R mapview for Quick Maps (01_03)
Lesson 3 of 34
In Progress

mapview for Quick Maps (01_03)

Learn More

As noted in the video, the mapview package does provide advanced customizability for the maps created. However, it’s recommended that you instead focus on using the leaflet package for publication-quality level interactive maps (the third section of this course). You can find the mapview package documentation here.

Have any questions? Put them below and we will help you out!

    1. Charlie Hadley February 14, 2022

      Hi Perry! In this course I chose to cover only one option for static and interactive maps. I prefer {ggplot2} because it’s more widely used than {tmap}, and it also has an extensive collection of packages that extend its capabilities. Here are some useful extensions when it comes to maps:

      On top of this, the {cowplot} and {patchwork} packages are both designed for assembling multiple {ggplot2} charts together – which includes maps built using geom_sf().

      However, I do recognise that {tmap} is very powerful and can be used to create beautiful maps. Because it is designed specifically with mapping in mind it often takes less code to do things in {tmap} vs {ggplot2}.

  2. Irantzu Alvarez February 14, 2022

    Hello,
    I am having problems with the instalation of ‘mapview’. First, I install the package (install.packages(“mapview”)) and it works, but when I say ‘library(mapview)’ RStudio chrases and stop working. What could be the problem?
    Thank you.

    1. Charlie Hadley February 14, 2022

      Hi Irantzu, sorry this is happening. Could you tell me a little bit about your set up:

      • What OS are you running
      • Could you run `version` in the R console and paste what appears – I’ve given an example below
      • Could you get the current version of RStudio by going to Help > About RStudio

      Example R version output

      > version
      _
      platform x86_64-apple-darwin17.0
      arch x86_64
      os darwin17.0
      system x86_64, darwin17.0
      status
      major 4
      minor 1.1
      year 2021
      month 08
      day 10
      svn rev 80725
      language R
      version.string R version 4.1.1 (2021-08-10)
      nickname Kick Things

      1. Irantzu Alvarez February 14, 2022

        Hi Charlie,
        Thank you very much for your reply. Here ther versions:
        – OS: Windows 10.
        – R version:
        > version
        _
        platform x86_64-w64-mingw32
        arch x86_64
        os mingw32
        system x86_64, mingw32
        status
        major 4
        minor 0.2
        year 2020
        month 06
        day 22
        svn rev 78730
        language R
        version.string R version 4.0.2 (2020-06-22)
        nickname Taking Off Again

        – RStudio version: Version 1.3.1073

        Thank you,
        irantzu

        1. Charlie Hadley February 15, 2022

          Thanks, Irantzu.

          Your RStudio is fairly old, and I know that has caused issues for some packages like {mapview}. I’d recommend installing the latest version of RStudio and seeing if that fixes it.

          If the problem remains the next thing I’d try is updating R. However, you’ll need to reinstall your packages afterwards.

          If you continue to have the issue after upgrading both R and RStudio it’s likely there’s a bug and we should try and capture info about your system to help the package developer fix the bug. Could you comment again if you continue to have this issue? Thanks, Charlie

  3. Latif Apaassongo Ibrahim February 16, 2022

    Hi,
    I might be missing something. All map effects below, do show up in viewer pane of my RStudio.
    The map effects at:
    2:56 and 4:00 (colored map of countries)
    4:12 (pop-up menu upon clicking),
    4:56 (rings around tiny countries) and
    5:32 (colored map of states with the US).
    I will appreciate any assistance.

    Thank you!!.

    1. Charlie Hadley February 18, 2022

      Hello Latif. I’m sorry I didn’t quite understand your question, could you help me? Is the problem that the mapview maps are not showing at all for you? Are the maps showing in a separate window or your browser instead? Thanks, Charlotte.

      1. Latif Apaassongo Ibrahim February 18, 2022

        Sorry for the mix up. I meant to say. “All the map effects below, do *not* show up in viewer pane of my RStudio.”

        *The maps do show up*. However, my visuals differ from those in the lesson clip. For instance, the blue colored map of countries at 2:56 and 4:00 do not appear. At 4:12, a pop-up menu appear in the lesson video upon clicking (on Antarctica). I can’t get the menu to show.
        Also, I do not see the rings around tiny countries at 4:56 and the colored map of states with the US at 5:32.

        I hope my question is clearer now.🙏🏾

        1. Charlie Hadley February 22, 2022

          Hi Latif – thanks for coming back with more information. I wonder if you’ve got an older version of RStudio and that’s the issue. Could you try to update RStudio and see if {mapview} continues to not show the data layers?

  5. Laura Coleman October 28, 2022

    I am having issues downloading the albersusa package from github. Here is the error that I receive:
    > remotes::install_github(“hrbrmstr/albersusa”)
    Downloading GitHub repo hrbrmstr/albersusa@HEAD
    Error in utils::download.file(url, path, method = method, quiet = quiet, :
    cannot open URL ‘https://api.github.com/repos/hrbrmstr/albersusa/tarball/HEAD’

    Is there a different way to install this package?

      1. Charlie Hadley October 31, 2022

        Hello Laura,

        Sorry you’re having an issue with this. My understanding of the archive process is that it shouldn’t affect how remotes::install_github() works.

        Could you reply with the output you get from running this code, please?

        R.version

  6. Jeremy Danz February 12, 2023

    Hi Charlie – when trying to run
    alaska_landcover %>%
    mapview()

    I got 2 error messages. The first said something about max pixel size and seemed to include a suggested solution in the error message, so I added maxpixels = 7194132, and that portion of the error isn’t appearing.

    However, I’m still getting this message and the map of Alaska is not loading:
    Error in `levels<-`(`*tmp*`, value = as.character(levels)) :
    factor level [3] is duplicated

    Any ideas on this one? Thanks!!

    1. Charlie Hadley February 13, 2023

      Hello Jeremy,

      The good news is that you’re not making any mistakes. But, unfortunately the bottom is falling out of {raster} due to the retirement of {rgdal} in 2023. This means there will be unexpected behaviours as progress forwards in time. I need to think about how to update this course around those issues, as they’re coming in more quickly than I expected.

      My recommended workflow is to move to {terra} which I demonstrate in this 4min video. Which using this code:


      library(rnaturalearthdata)
      # remotes::install_github("hrbrmstr/albersusa")
      library(albersusa)
      library(sf)
      library(raster)
      library(mapview)

      alaska_landcover <- raster("data/alaska_landcover.img") alaska_landcover %>%
      mapview()

      # terra -------------------------------------------------------------------

      library(terra)

      alaska_terra <- rast("data/alaska_landcover.img") alaska_terra %>%
      mapview()

      # tidyterra ---------------------------------------------------------------

      library(tidyverse)
      library(tidyterra)

      alaska_recoded <- alaska_terra %>%
      mutate(red_recoded = case_when(Red == 75 ~ NA,
      TRUE ~ Red))

      ggplot() +
      geom_spatraster(data = alaska_recoded,
      aes(fill = red_recoded))

      2. Elisee Tchana May 30, 2023

        Hello Charlie,
        Thanks for the new code. I tried it side and still got an error.
        Any idea on this one? Thanks!!

        Error in `dplyr::mutate()`:
        ℹ In argument: `red_recoded = case_when(Red == 75 ~ NA, TRUE ~ Red)`.
        Caused by error in `case_when()`:
        ! Failed to evaluate the left-hand side of formula 1.
        Caused by error:
        ! object ‘Red’ not found
        Run `rlang::last_trace()` to see where the error occurred.
        > rlang::last_trace()

        Error in `dplyr::mutate()`:
        ℹ In argument: `red_recoded = case_when(Red == 75 ~ NA, TRUE ~ Red)`.
        Caused by error in `case_when()`:
        ! Failed to evaluate the left-hand side of formula 1.
        Caused by error:
        ! object ‘Red’ not found
        —
        Backtrace:
        ▆
        1. ├─alaska_terra %>% …
        2. ├─dplyr::mutate(…)
        3. ├─tidyterra:::mutate.SpatRaster(…)
        4. │ ├─dplyr::mutate(values, …)
        5. │ └─dplyr:::mutate.data.frame(values, …)
        6. │ └─dplyr:::mutate_cols(.data, dplyr_quosures(…), by)
        7. │ ├─base::withCallingHandlers(…)
        8. │ └─dplyr:::mutate_col(dots[[i]], data, mask, new_columns)
        9. │ └─mask$eval_all_mutate(quo)
        10. │ └─dplyr (local) eval()
        11. └─dplyr::case_when(Red == 75 ~ NA, TRUE ~ Red)
        12. └─dplyr:::case_formula_evaluate(…)
        13. ├─base::withCallingHandlers(…)
        14. └─rlang::eval_tidy(pair$lhs, env = default_env)

        1. Charlie Hadley June 1, 2023

          Hello Elisee!

          The error message is telling us that mutate wasn’t able to find a column called `Red` which suggests to me that you accidentally mis-selected or otherwise didn’t quite run the code in the correct order.

          Can you check if you piped the dataset into mutate, eg

          alaska_terra %>%
          mutate(red_recoded = case_when(Red == 75 ~ NA,
          TRUE ~ Red))

          Thanks,

          Charlie