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Generate the minimum travel time to nearest major city

Source: R/data_traveltime.R
gen_traveltime_min.Rd

Aggregates the high-resolution travel time raster to PRIO-GRID cells and computes the minimum travel time within each cell. This is useful for identifying the fastest travel access to major cities within a PRIO-GRID cell.

Usage

gen_traveltime_min()

Value

A single-layer SpatRaster object

Details

This function is a convenience wrapper around calc_traveltime using aggregation_function = "min". It reads the global travel time raster and summarizes each PRIO-GRID cell to the minimum travel time value.

References

Nelson (2008). “Travel Time to Major Cities: A Global Map of Accessibility.” 2025-05-14.

Examples

if (FALSE) { # \dontrun{
# Generate minimum travel time raster
r <- gen_traveltime_min()
terra::plot(r, main = "Minimum Travel Time to Nearest Major City")

# Extract values for a specific region (e.g., West Africa)
africa_extent <- terra::ext(-20, 20, 0, 20)
r_africa <- terra::crop(r, africa_extent)
terra::plot(r_africa, main = "Minimum Travel Time in West Africa")
} # }