{
  "retrieved": "2026-10-08",
  "sources": [
    {
      "file": "countries.geojson",
      "url": "https://raw.githubusercontent.com/nvkelso/natural-earth-vector/master/geojson/ne_50m_admin_0_countries.geojson",
      "retrieved": "2026-10-08",
      "sha256": "3e458fc036ad0a66411f2c1e6cac49c5d7bfb81cb1123bc513b22511a2b7fdeb"
    },
    {
      "file": "cities.geojson",
      "url": "https://raw.githubusercontent.com/nvkelso/natural-earth-vector/master/geojson/ne_10m_populated_places.geojson",
      "retrieved": "2026-10-08",
      "sha256": "9b8e3de09048ef00dfc70357dbb9fa324493f214b5e0ae4daf1aa79a8d10116b"
    },
    {
      "file": "kac.csv",
      "url": "https://www.data.go.kr/cmm/cmm/fileDownload.do?atchFileId=FILE_000000007709296&fileDetailSn=1&insertDataPrcus=N",
      "landingPage": "https://www.data.go.kr/data/15002851/fileData.do",
      "retrieved": "2026-10-08",
      "referenceDate": "2026-09-23",
      "sha256": "dac31fa45a4cc4c31ef653a9d54ed35248777547da8eb2d9f3f67f64abd38c57",
      "rows": 14,
      "license": "이용허락범위 제한 없음 / no restrictions",
      "transformation": "WGS84 latitude/longitude retained; explicitly matched 14 airport names to IATA codes; replaces OurAirports coordinates only for those airports. Incheon not included."
    },
    {
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      "url": "https://raw.githubusercontent.com/davidmegginson/ourairports-data/main/airports.csv",
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      "transformation": "Explicit longitude_deg and latitude_deg columns; medium/large airport subset with IATA codes. KAC overrides preserved."
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    "OurAirports": "Public domain — https://ourairports.com/data/"
  },
  "boundaryPolicy": "Natural Earth de facto boundaries; not a government-certified map. Simplified for display, not navigation.",
  "counts": {
    "countriesAndAreas": 242,
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    "airports": 4568
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  "officialReferenceMap": "https://www.ngii.go.kr/child/content.do?sq=149",
  "officialReferenceStatus": "NGII image download offered. Vector dataset and commercial modification terms not verified; not embedded."
}