{
  "name": "Silk Road: coordinates and straight-line distances",
  "desc": "Straight-line distances between six places named by Richthofen, from GeoNames coordinates, as great circles on a sphere and as geodesics on the WGS84 ellipsoid, with the formula on every row.",
  "lic": "CC BY 4.0",
  "lic_url": "https://creativecommons.org/licenses/by/4.0/",
  "by": "Treaties & Tradeoffs",
  "url": "https://treatiesandtradeoffs.com/logistics/silk-road/",
  "from": [
    "GeoNames (geonames.org), CC BY 4.0",
    "Ferdinand von Richthofen, China, vol. 1 (Berlin: Reimer, 1877)"
  ],
  "how": "Compiled by Treaties & Tradeoffs from the data listed",
  "data_by": [
    "Coordinates: GeoNames (geonames.org), records 167357, 1218667, 1147290, 1280849, 1529531, 1790630, accessed 2026-11-02, CC BY 4.0",
    "Place names: Ferdinand von Richthofen, China, vol. 1 (Berlin: Reimer, 1877), Staatsbibliothek zu Berlin digital copy, accessed 2026-11-02, public domain"
  ]
}