class: center, middle, inverse, title-slide # <p>Spatial data in R:<br /> an introduction to the sf package</p> ## Henry Partridge ### R at the University of Manchester (RUM) Group ### 2017-06-05 --- # Using R as a GIS - R packages include many functions that can be used for reading, writing, manipulating, analysing and modelling spatial data ([Bivand 2017](https://cran.r-project.org/web/views/Spatial.html)) - The [sp](https://cran.r-project.org/web/packages/sp/index.html) R package is used to handle vector data and the [raster](https://cran.r-project.org/web/packages/raster/index.html) package for manipulating gridded spatial data - Many R packages bundle boundary data like [tigris](https://cran.r-project.org/web/packages/tigris/index.html), [rworldmap](https://cran.r-project.org/web/packages/rworldmap/index.html) and [osmdata](https://cran.r-project.org/web/packages/osmdata/index.html), whilst [tidycensus](https://walkerke.github.io/tidycensus/index.html) and [spData](https://github.com/Nowosad/spData) include datasets for spatial analysis - Spatial data are commonly visualised in R using [leaflet](https://cran.r-project.org/web/packages/leaflet/index.html), [tmap](https://cran.r-project.org/web/packages/tmap/index.html), [mapview](https://cran.r-project.org/web/packages/mapview/index.html), [ggplot2](https://cran.r-project.org/web/packages/ggplot2/index.html) and [rasterVis](https://cran.r-project.org/web/packages/rasterVis/index.html) packages - R interfaces with proprietary and open source GIS software like ArcGIS ([arcgisbinding](https://r-arcgis.github.io/assets/arcgisbinding.pdf)) and QGIS ([RQGIS](https://cran.r-project.org/web/packages/RQGIS/index.html)) --- class: inverse, center, middle # [sf](https://cran.r-project.org/web/packages/sf/index.html) --- # The sf package - intended to (eventually) replace the [sp](https://cran.r-project.org/web/packages/sp/index.html) package - provides support for [Simple Features](https://en.wikipedia.org/wiki/Simple_Features), a formal standard used in spatial databases (e.g. [PostGIS](http://postgis.net)) and GIS software (e.g. [ESRI's ArcGIS](http://www.esri.com)). - can perform geometric operations by interfacing with [GEOS](https://trac.osgeo.org/geos) - can read and write to most vector and raster spatial data formats using [GDAL](http://www.gdal.org) - sits within the [tidyverse](http://tidyverse.org) framework: - adopts pipe-friendly functions - stores attribute data and feature geometries in manipulable data frames --- class: inverse, center, middle # Demo --- class: left, middle The R script can be found at: [https://github.com/rcatlord/talks/blob/master/rumgroup/script.R](https://github.com/rcatlord/talks/blob/master/rumgroup/script.R) and the R notebook at: [https://cdn.rawgit.com/rcatlord/talks/70080537/rumgroup/notebook.nb.html](https://cdn.rawgit.com/rcatlord/talks/70080537/rumgroup/notebook.nb.html) --- # Resources - Pebesma, E. (2017). sf: Simple Features for R. R package, version 0.4-3. [https://cran.r-project.org/web/packages/sf/index.html](https://cran.r-project.org/web/packages/sf/index.html) - Lovelace, R., & Cheshire, J. (2017). ["Introduction to visualising spatial data in R."](https://cran.r-project.org/doc/contrib/intro-spatial-rl.pdf) - Machlis, S. (2017, March 3). Mapping in R just got a whole lot easier. [Blog post]. Retrieved from [http://www.computerworld.com/article/3175623/data-analytics/mapping-in-r-just-got-a-whole-lot-easier.html](http://www.computerworld.com/article/3175623/data-analytics/mapping-in-r-just-got-a-whole-lot-easier.html) - Pebesma, E. (2017, January 1). sf - plot, graticule, transform, units, cast, is. [Blog post]. Retrieved from [http://r-spatial.org/r/2017/01/12/newssf.html](http://r-spatial.org/r/2017/01/12/newssf.html) - Strimas-Mackey, M. (2017, March 9). Tidy spatial data in R: using dplyr, tidyr, and ggplot2 with sf. [Blog post]. Retrieved from [http://strimas.com/r/tidy-sf/](http://strimas.com/r/tidy-sf/) - Williamson, G. (2017, May 4). Polygon intersection and summary with sf. [Blog post]. Retrieved from [https://atriplex.info/blog/index.php/2017/05/24/polygon-intersection-and-summary-with-sf/](https://atriplex.info/blog/index.php/2017/05/24/polygon-intersection-and-summary-with-sf/) --- class: inverse, center, middle # Questions?