dodgr (version 0.4.2)

os_roads_bristol: 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.

See Also

Other data: hampi, weighting_profiles

Examples

if (FALSE) {
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