Fetching OSM roads

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Fetching OSM roads

Overview

fetch_osm_roads() provides a lightweight wrapper around osmdata that returns a road-line sf object you can pass directly into the rest of the trafficCAR workflow. It accepts either a place name (geocoded to a bounding box) or explicit bounding-box coordinates. Note that fetch_osm_roads() requires the osmdata package.

Fetch by place name

library(trafficCAR)

# Query a place name (uses osmdata::getbb() under the hood)
roads_sf <- fetch_osm_roads("College Station, TX")

segments <- roads_to_segments(roads_sf)
net <- build_network(segments)

Fetch by bounding box

library(trafficCAR)

# xmin, ymin, xmax, ymax
bbox <- c(-96.38, 30.59, -96.33, 30.63)
roads_sf <- fetch_osm_roads(bbox)

segments <- roads_to_segments(roads_sf)
net <- build_network(segments)

Filtering the OSM query

You can refine the query by passing highway values or additional tags.

roads_sf <- fetch_osm_roads(
  "College Station, TX",
  value = c("primary", "secondary"),
  extra_tags = list(surface = "asphalt")
)

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