A sample street network for Bristol, U.K., from the Ordnance Survey.
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 these licensing conditions, and must be cited as follows: Contains OS data © Crown copyright and database right (2017)
See also
Other data:
hampi
,
weighting_profiles
Examples
if (FALSE) { # \dontrun{
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)
} # }
# 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