usr110 / stplanr

R package providing functions and data access for transport research

stplanr

This is a package for sustainable transport planning with R (stplanr).

It brings together a range of tools for transport planning practitioners and researchers to 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 National Propensity to Cycle Tool (NPCT) project to identify where bicycle paths are most urgently needed.

stplanr aims to be of use 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.

Key functions

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 (Caceres 2007). stplanr facilitates this with od2line(), which takes flow and geographical data as inputs and outputs a SpatialLinesDataFrame. 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, for example through a link to the CycleStreets.net API.

Route functions take lat/lon inputs:

trip <-
  route_cyclestreet(from = c(-1, 53), to = c(-1.1, 53), plan = "balanced")

and place names, found using the Google Map API:

trip <- route_cyclestreet("London", "Birmingham, UK", plan = "balanced")
# devtools::install_github("mtennekes/tmap", subdir = "pkg")
library(tmap)
osm_tiles <- read_osm(bb(bbox(trip), ext = 1.5))
tm_shape(osm_tiles) +
  tm_raster() +
  tm_shape(trip) +
  tm_lines(lwd = 3)

\

We can replicate this call to CycleStreets.net multiple times using line2route.

# Remove intra-zone flow
intrazone <- travel_network$Area.of.residence == travel_network$Area.of.workplace
travel_network <- travel_network[!intrazone,]
t_routes <- line2route(travel_network)
plot(t_routes)

\

Another way to visualise this is with the leaflet package (not shown):

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 segmentes and aggregates the values of overlapping lines. This can represent where there will be most traffic on the transport system, as illustrated below using the tmap package.

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

osm_tiles <- read_osm(bb(rnet, ext = 1.05))
rnet$lwd <- rnet$All / mean(rnet$All)
tm_shape(osm_tiles) +
    tm_raster(saturation = .25) +
tm_shape(rnet) +
    tm_lines(lwd = "lwd", scale = 5, legend.lwd.show = FALSE)  +
tm_shape(cents) +
    tm_bubbles()

\

Installation

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.

Installing rgdal on Ubuntu and Mac

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.

Funtions, help and contributing

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

Meta

• 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.