This repository hosts the code underlying Geocomputation with R, a book by Robin Lovelace, Jakub Nowosad, and Jannes Muenchow:

Lovelace, Robin, Jakub Nowosad and Jannes Muenchow (2019). Geocomputation with R. The R Series. CRC Press.

This book has been published by CRC Press in the R Series. The online version of this book is free to read at https://geocompr.robinlovelace.net/.

We encourage contributions on any part of the book, including:

• Improvements to the text, e.g. clarifying unclear sentences, fixing typos (see guidance from Yihui Xie).
• Changes to the code, e.g. to do things in a more efficient way.
• Suggestions on content (see the project’s issue tracker).

Please see our-style.md for the book’s style.

Many thanks to all contributors to the book so far via GitHub (this list will update automatically): prosoitos, florisvdh, katygregg, erstearns, eyesofbambi, tyluRp, marcosci, giocomai, mdsumner, rsbivand, pat-s, gisma, ateucher, annakrystalli, kant, gavinsimpson, Henrik-P, Himanshuteli, yutannihilation, jbixon13, katiejolly, layik, mvl22, nickbearman, ganes1410, richfitz, SymbolixAU.

During the project we aim to contribute ‘upstream’ to the packages that make geocomputation with R possible. This impact is recorded in our-impact.csv.

To ease reproducibility, this book is also a package. Installing it from GitHub will ensure all dependencies to build the book are available on your computer (you need remotes):

install.packages("remotes")
remotes::install_github("geocompr/geocompkg")

You need a recent version of the GDAL, GEOS, PROJ and UDUNITS libraries installed for this to work on Mac and Linux. See the sf package’s README for information on that.

Once the dependencies have been installed you should be able to build and view a local version the book with:

bookdown::render_book("index.Rmd") # to build the book
browseURL("_book/index.html") # to view it

To ease reproducibility we have set-up a docker image (robinlovelace/geocompr on docker hub) containing all the dependencies needed to reproduce the book. After you have installed docker and set-it up on your computer you can start a rocker-docker RStudio Server version by running:

docker run -p 8787:8787 -e DISABLE_AUTH=TRUE robinlovelace/geocompr

If it worked you should be able to open-up RStudio server by opening a browser and navigating to http://localhost:8787/ resulting in an up-to-date version of R and RStudio running in a container.

On the other hand, you could also start a plain R session running:

docker run -it robinlovelace/geocompr R

To reproduce the entire book in the docker container, you will also need to mount your local geocompr repository with the following steps (resulting in output shown below):

# download repo with Windows Powershell or a Unix terminal
git clone https://github.com/Robinlovelace/geocompr.git 
# or download manually from here:
# https://github.com/Robinlovelace/geocompr/archive/master.zip
cd geocompr # navigate into the repo
# on linux and mac:
docker run -d -p 8787:8787 -e DISABLE_AUTH=TRUE -v $(pwd):/home/rstudio/geocompr  robinlovelace/geocompr
# on windows:
docker run -d -p 8787:8787 -v ${pwd}:/home/rstudio/data -e DISABLE_AUTH=TRUE robinlovelace/geocompr

If you see something like this after following the steps above, congratulations: it worked! See github.com/rocker-org for more info.

From this point to build the book you can open projects in the geocompr directory from the project box in the top-right hand corner, and knit index.Rmd with the little knit button above the the RStudio script panel (Ctl+Shift+B should do the same job).

To reduce the book’s dependencies, scripts to be run infrequently to generate input for the book are run on creation of this README.

The additional packages required for this can be installed as follows:

source("code/extra-pkgs.R")

With these additional dependencies installed, you should be able to run the following scripts, which create content for the book, that we’ve removed from the main book build to reduce package dependencies and the book’s build time:

# source("code/cranlogs.R")
# source("code/sf-revdep.R")
# source("code/08-urban-animation.R")
# source("code/08-map-pkgs.R")

Note: the .Rproj file is configured to build a website not a single page. To reproduce this README use the following command:

rmarkdown::render("README.Rmd", output_format = "github_document", output_file = "README.md")

An indication of the book’s progress over time is illustrated below (to be updated roughly every week as the book progresses).

Book statistics: estimated number of pages per chapter over time.

To cite packages used in this book we use code from Efficient R Programming:

# geocompkg:::generate_citations()

This generates .bib and .csv files containing the packages. The current of packages used can be read-in as follows:

pkg_df = readr::read_csv("extdata/package_list.csv")

Other citations are stored online using Zotero.

If you would like to add to the references, please use Zotero, join the open group add your citation to the open geocompr library.

We use the following citation key format:

[auth:lower]_[veryshorttitle:lower]_[year]

This can be set from inside Zotero desktop with the Better Bibtex plugin installed (see github.com/retorquere/zotero-better-bibtex) by selecting the following menu options (with the shortcut Alt+E followed by N), and as illustrated in the figure below:

Edit > Preferences > Better Bibtex

Zotero settings: these are useful if you want to add references.

We use Zotero because it is a powerful open source reference manager that integrates well with the citr package. As described in the GitHub repo Robinlovelace/rmarkdown-citr-demo.

knitr::kable(pkg_df)