os_roads_bristol: Sample street network from Bristol, U.K.

In dodgr: Distances on Directed Graphs

Sample street network from Bristol, U.K.

Description

A sample street network for Bristol, U.K., from the Ordnance Survey.

Format

A Simple Features sf data.frame representing motorways in Bristol, UK.

Note

Input data downloaded from https://osdatahub.os.uk/downloads/open, To download the data from that page click on the tick box next to 'OS Open Roads', scroll to the bottom, click 'Continue' and complete the form on the subsequent page. This dataset is open access and can be used under the Open Government License and must be cited as follows: Contains OS data © Crown copyright and database right (2017)

See Also

Other data: hampi, weighting_profiles

Examples

## Not run: 
library (sf)
library (dplyr)
# data must be unzipped here
# os_roads <- sf::read_sf("~/data/ST_RoadLink.shp")
# u <- paste0 (
#     "https://opendata.arcgis.com/datasets/",
#     "686603e943f948acaa13fb5d2b0f1275_4.kml"
# )
# lads <- sf::read_sf(u)
# mapview::mapview(lads)
# bristol_pol <- dplyr::filter(lads, grepl("Bristol", lad16nm))
# os_roads <- st_transform(os_roads, st_crs(lads)
# os_roads_bristol <- os_roads[bristol_pol, ] %>%
#   dplyr::filter(class == "Motorway" &
#                 roadNumber != "M32") %>%
#   st_zm(drop = TRUE)
# mapview::mapview(os_roads_bristol)

## End(Not run)
# Converting this 'sf data.frame' to a 'dodgr' network requires manual
# specification of weighting profile:
colnm <- "formOfWay" # name of column used to determine weights
wts <- data.frame (
    name = "custom",
    way = unique (os_roads_bristol [[colnm]]),
    value = c (0.1, 0.2, 0.8, 1)
)
net <- weight_streetnet (
    os_roads_bristol,
    wt_profile = wts,
    type_col = colnm, id_col = "identifier"
)
# 'id_col' tells the function which column to use to attribute IDs of ways

dodgr documentation built on June 7, 2023, 5:44 p.m.