dodgr (version 0.1.1)

os_roads_bristol: os_roads_bristol

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.

Examples

# NOT RUN {
library(sf)
library(dplyr)
os_roads <- sf::read_sf("~/data/ST_RoadLink.shp") # data must be unzipped here
u <- "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)
# }
# 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 <- c (0.1, 0.2, 0.8, 1)
names (wts) <- unique (os_roads_bristol [[colnm]])
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
# }