Download global travel time to a city or port data on rasters at a 30 arc-seconds (about 1 km2) resolution.
travel_time(to="city", size=1, up=FALSE, path, ...)SpatRaster
character. "city" or "port"
positive integer indicating the size of the city or port. Can be between 1 and 9 if to="city" or between 1 and 5 if to="port". See Details
logical. If TRUE the travel time to a city of the size chosen or larger is returned
character. Path for storing the downloaded data. See geodata_path
additional arguments passed to download.file
Description of the the size argument.
to="city"
| size | Inhabitants | |
| 1 | 5,000,000 to 50,000,000 | |
| 2 | 1,000,000 to 5,000,000 | |
| 3 | 500,000 to 1,000,000 | |
| 4 | 200,000 to 500,000 | |
| 5 | 100,000 to 200,000 | |
| 6 | 50,000 to 100,000 | |
| 7 | 20,000 to 50,000 | |
| 8 | 10,000 to 20,000 | |
| 9 | 5,000 to 10,000 |
to="port"
| size | Description | Number of ports | |
| 1 | Large | 160 | |
| 2 | Medium | 361 | |
| 3 | Small | 990 | |
| 4 | Very small | 2,153 | |
| 5 | Any | 3,778 |
Nelson, A., D.J. Weiss, J. van Etten, A. Cattaneo, T.S. McMenomy & J. Koo, 2019. A suite of global accessibility indicators. Scientific Data 6: 266. doi:10.1038/s41597-019-0265-5
Version 3 (2019-05-15) from https://figshare.com/articles/dataset/Travel_time_to_cities_and_ports_in_the_year_2015/7638134/3