A dataset containing Census tract polygons, candidate facility points, and a pre-computed driving travel-time matrix for Tarrant County, Texas. Used for demonstrating facility location algorithms with real travel times.
Format
A list with four elements:
- tracts
An sf object with Census tract polygons including GEOID, NAME, population, and geometry columns.
- demand
An sf object with tract centroid points (demand locations) in WGS84 coordinates.
- candidates
An sf object with 30 randomly sampled candidate facility locations in WGS84 coordinates.
- matrix
A numeric matrix of driving travel times in minutes. Rows correspond to demand points, columns to candidate facilities. Unreachable pairs are set to Inf.
Source
Census tract data from the American Community Survey via tidycensus. Road network from OpenStreetMap via GeoFabrik. Travel times computed with r5r.
Details
The travel-time matrix was generated using r5r with OpenStreetMap road
network data clipped to Tarrant County. Candidate facilities were sampled
using set.seed(1983) for reproducibility.
Examples
data(tarrant_travel_times)
# Access components
tracts <- tarrant_travel_times$tracts
demand <- tarrant_travel_times$demand
candidates <- tarrant_travel_times$candidates
ttm <- tarrant_travel_times$matrix
# Use with p_median
result <- p_median(
demand = demand,
facilities = candidates,
n_facilities = 5,
weight_col = "population",
cost_matrix = ttm
)