richardellison / stplanr Goto Github PK

stplanr is a package for sustainable transport planning with R.

It provides functions for solving common problems in transport planning and modelling, such as how to best get from point A to point B. The overall aim is to provide a reproducible, transparent and accessible toolkit to help people better understand transport systems and inform policy.

The initial work on the project was funded by the Department of Transport (DfT) as part of the development of the Propensity to Cycle Tool (PCT). The PCT uses origin-destination data as the basis of spatial analysis and modelling work to identify where bicycle paths are most needed. See the package vignette (e.g. via vignette("introducing-stplanr")) or an academic paper on the Propensity to Cycle Tool (PCT) for more information on how it can be used. This README gives some basics.

stplanr should be useful to researchers everywhere. The function route_graphhopper(), for example, works anywhere in the world using the graphhopper routing API and read_table_builder() reads-in Australian data. We welcome contributions that make transport research easier worldwide.

Data frames representing flows between origins and destinations must be combined with geo-referenced zones or points to generate meaningful analyses and visualisations of 'flows' or origin-destination (OD) data. stplanr facilitates this with od2line(), which takes flow and geographical data as inputs and outputs spatial data. Some example data is provided in the package:

library(stplanr)
data(cents, flow)

Let's take a look at this data:

flow[1:3, 1:3] # typical form of flow data
#>        Area.of.residence Area.of.workplace All
#> 920573         E02002361         E02002361 109
#> 920575         E02002361         E02002363  38
#> 920578         E02002361         E02002367  10
cents[1:3,] # points representing origins and destinations
#> class       : SpatialPointsDataFrame 
#> features    : 3 
#> extent      : -1.546463, -1.511861, 53.8041, 53.81161  (xmin, xmax, ymin, ymax)
#> coord. ref. : +init=epsg:4326 +proj=longlat +datum=WGS84 +no_defs +ellps=WGS84 +towgs84=0,0,0 
#> variables   : 4
#> names       :  geo_code,  MSOA11NM, percent_fem,  avslope 
#> min values  : E02002382, Leeds 053,    0.408759, 2.284782 
#> max values  : E02002393, Leeds 064,    0.458721, 2.856563

These datasets can be combined as follows:

travel_network <- od2line(flow = flow, zones = cents)
w <- flow$All / max(flow$All) *10
plot(travel_network, lwd = w)

The package can also allocate flows to the road network, e.g. with CycleStreets.net and the OpenStreetMap Routing Machine (OSRM) API interfaces. These are supported in route_*() functions such as route_cyclestreets and route_osrm():

Route functions take lat/lon inputs:

trip <-
  route_osrm(from = c(-1, 53), to = c(-1.1, 53))

and place names, found using the Google Map API:

We can replicate this call multiple times using line2route.

intrazone <- travel_network$Area.of.residence == travel_network$Area.of.workplace
travel_network <- travel_network[!intrazone,]
t_routes <- line2route(travel_network, route_fun = route_osrm)
plot(t_routes)

Another way to visualise this is with the leaflet package:

library(leaflet)
leaflet() %>% addTiles() %>% addPolylines(data = t_routes)

For more examples, example("line2route").

overline is a function which takes a series of route-allocated lines, splits them into unique segments and aggregates the values of overlapping lines. This can represent where there will be most traffic on the transport system, as illustrated below.

t_routes$All <- travel_network$All
rnet <- overline(t_routes, attrib = "All", fun = sum)

lwd <- rnet$All / mean(rnet$All)
plot(rnet, lwd = lwd)
points(cents)

To install the stable version, use:

install.packages("stplanr")

The development version can be installed using devtools:

# install.packages("devtools") # if not already installed
devtools::install_github("ropensci/stplanr")
library(stplanr)

stplanr depends on rgdal, which can be tricky to install.

On Ubuntu rgdal can be installed with:

sudo apt-get install r-cran-rgdal

Using apt-get ensures the system dependencies, such as gdal are also installed.

On Mac, homebrew can install gdal. Full instructions are provided here.

The current list of available functions can be seen with:

lsf.str("package:stplanr", all = TRUE)

To get internal help on a specific function, use the standard way.

?od2line

stplanr imports many great packages that it depends on. Many thanks to the developers of these tools:

desc = read.dcf("DESCRIPTION")
headings = dimnames(desc)[[2]]
fields = which(headings %in% c("Depends", "Imports", "Suggests"))
pkgs = paste(desc[fields], collapse = ", ")
pkgs = gsub("\n", " ", pkgs)
strsplit(pkgs, ",")[[1]]
#>  [1] "sp"                " R (>= 3.0)"       " curl"            
#>  [4] " readr"            " dplyr"            " httr"            
#>  [7] " jsonlite"         " stringi"          " stringr"         
#> [10] " lubridate"        " maptools"         " raster"          
#> [13] " rgdal"            " rgeos"            " openxlsx"        
#> [16] " methods"          " R.utils"          " geosphere"       
#> [19] " Rcpp (>= 0.12.1)" " igraph"           " nabor"           
#> [22] " rlang"            " sf"               " testthat"        
#> [25] " knitr"            " rmarkdown"        " dodgr"

• Please report issues, feature requests and questions to the github issue tracker
• License: MIT
• Get citation information for stplanr in R doing citation(package = 'stplanr')
• This project is released with a Contributor Code of Conduct. By participating in this project you agree to abide by its terms.