{
  "sources": [
    {
      "filename": "countries.zip",
      "publisher": "Natural Earth",
      "title": "Admin 0 Countries",
      "embedded_version": "5.1.1",
      "resolution": "1:50 million",
      "download_url": "https://naturalearth.s3.amazonaws.com/50m_cultural/ne_50m_admin_0_countries.zip",
      "source_page": "https://www.naturalearthdata.com/downloads/50m-cultural-vectors/50m-admin-0-countries-2/",
      "retrieved_at_utc": "2026-11-05T20:47:07.886497+00:00",
      "retrieval_timestamp_basis": "download response log",
      "bytes": 799734,
      "sha256": "5fed433373581fa648920435f937d95f2d3c0200e067409c6478dcdf1b853139",
      "terms": "Public domain",
      "terms_url": "https://www.naturalearthdata.com/about/terms-of-use/",
      "attribution": "Made with Natural Earth",
      "coverage": "Global generalized country/territory polygons",
      "limitations": "Generalized de facto boundaries, not legal or survey geometry"
    },
    {
      "filename": "regions.zip",
      "publisher": "Natural Earth",
      "title": "Geographic Regions Polygons",
      "embedded_version": "5.0.0",
      "resolution": "1:50 million",
      "download_url": "https://naturalearth.s3.amazonaws.com/50m_physical/ne_50m_geography_regions_polys.zip",
      "source_page": "https://www.naturalearthdata.com/downloads/50m-physical-vectors/50m-physical-labels/",
      "retrieved_at_utc": "2026-11-06T02:58:19.499380+00:00",
      "retrieval_timestamp_basis": "download file completion mtime",
      "bytes": 1622125,
      "sha256": "a6e7ac257f6f0847ed80e6dc6e776441456652c093cfe90c7bf26dc8069f0d03",
      "terms": "Public domain",
      "terms_url": "https://www.naturalearthdata.com/about/terms-of-use/",
      "attribution": "Made with Natural Earth",
      "coverage": "Physical region labels, used only to trace the Eurasian divider",
      "limitations": "Approximate physical-region boundaries, not universal continental definitions"
    },
    {
      "filename": "ice-shelves.zip",
      "publisher": "Natural Earth",
      "title": "Antarctic Ice Shelves Polygons",
      "embedded_version": "4.1.0",
      "resolution": "1:50 million",
      "download_url": "https://naturalearth.s3.amazonaws.com/50m_physical/ne_50m_antarctic_ice_shelves_polys.zip",
      "source_page": "https://www.naturalearthdata.com/downloads/50m-physical-vectors/50m-antarctic-ice-shelves/",
      "retrieved_at_utc": "2026-11-06T03:12:05.284434+00:00",
      "retrieval_timestamp_basis": "download response log",
      "bytes": 80398,
      "sha256": "036a87f0e1873cbb848e5570622ea337e25ddfefc9759094207a1431a2ec329c",
      "terms": "Public domain",
      "terms_url": "https://www.naturalearthdata.com/about/terms-of-use/",
      "attribution": "Made with Natural Earth",
      "coverage": "Perennial Antarctic shelves; source lineage 2003\u201304 Mosaic of Antarctica; seasonal sea ice excluded",
      "limitations": "Historical ice extent, not a current ice-front survey; download page says 4.0.0 but archive VERSION.txt says 4.1.0"
    }
  ],
  "geographic_definitions": "config.json and data/processed/continents/component-membership.json",
  "course": "https://github.com/weitzman-musa/30DayMapChallenge"
}