{
  "schemaVersion": 1,
  "checkedAt": "2026-08-15",
  "sources": [
    {
      "id": "openstreetmap",
      "version": "snapshot-per-province",
      "officialPage": "https://www.openstreetmap.org/copyright",
      "license": "ODbL-1.0",
      "licenseURL": "https://opendatacommons.org/licenses/odbl/1-0/",
      "requiredAttribution": "© OpenStreetMap contributors",
      "actualUse": "Nationwide and Beijing names, waterway kind and geometry; clipping, simplification, stitching, stable IDs, tiling and candidate segmentation",
      "build31Fields": ["river.id", "river.name", "river.kind", "river.paths", "segment.id", "segment.name", "segment.geometry", "segment.region"],
      "evidence": "nationwide/provinces/*/manifest.json",
      "beijingRawPayloadSHA256": "8b1ee7837778b094a16bbef73a2c5f6be3116ab1c669d7127b82f2ab065f0ef5",
      "beijingSnapshot": "2026-07-25T04:06:15Z",
      "beijingMotherDatabaseSHA256": "7b6dad0db18af3dc1a1bb14b334af4fa98e11ea02cc0398517c88bf942217f8d"
    },
    {
      "id": "ec-jrc-gsw",
      "version": "GSW1_5_1984_2024",
      "officialPage": "https://global-surface-water.appspot.com/download",
      "licenseBasis": "Copernicus data access terms stated by the official JRC download page",
      "licenseURL": "https://www.copernicus.eu/main/data-access/",
      "requiredAttribution": "Source: EC JRC/Google",
      "actualUse": "Persistent-water evidence in the Beijing historical composite and allowlisted public projection; Build 31 summary records 113 matched satellite surfaces and 8 satellite-only candidates",
      "modifications": "occurrence >= 75%; 30 m; sieve 4; minimum 2500 square metres; clipped to pilot bbox",
      "tiles": [
        {"id": "110E_50N", "url": "https://storage.googleapis.com/water-world/download2024/VER1-5/occurrence/occurrence_110E_50N_v1_5_2024.tif", "bytes": 29937552, "etag": "399fde71c461a4b76938ed2b54808395", "sha256": "8ecf852346b490dbd8ca2a80e2803b95f0cae5ea712df1459216a6004f7be28c"},
        {"id": "110E_40N", "url": "https://storage.googleapis.com/water-world/download2024/VER1-5/occurrence/occurrence_110E_40N_v1_5_2024.tif", "bytes": 106033706, "etag": "d99717b033b7cf321357c69ba4404f59", "sha256": "e50e42b29ba7d8322fa20b39ae00b5627436a5376b97e94519123355e9a1c5d3"}
      ]
    },
    {
      "id": "esa-worldcover",
      "version": "2021_v200",
      "officialPage": "https://esa-worldcover.org/en/data-access",
      "license": "CC-BY-4.0",
      "licenseURL": "https://creativecommons.org/licenses/by/4.0/",
      "requiredAttribution": "© ESA WorldCover project 2021 / Contains modified Copernicus Sentinel data (2021) processed by ESA WorldCover consortium",
      "actualUse": "Aggregate corroboration of JRC water evidence only; no per-record geometry, classification or recommendation field",
      "modifications": "water class 80 queried via official COG HTTP range access",
      "tiles": [
        {"id": "N39E114", "url": "https://esa-worldcover.s3.eu-central-1.amazonaws.com/v200/2021/map/ESA_WorldCover_10m_2021_v200_N39E114_Map.tif", "bytes": 108133854, "etag": "53cd1e58714b67304fc33d9f7fe84bff-13", "sha256": "1abcb25bdbc0030eb2656dfba9881a333e0535f88a6d5ecee719c9ac476ea9ea"},
        {"id": "N39E117", "url": "https://esa-worldcover.s3.eu-central-1.amazonaws.com/v200/2021/map/ESA_WorldCover_10m_2021_v200_N39E117_Map.tif", "bytes": 113664937, "etag": "14373255c2bc84607f19e3b4caefa63d-14", "sha256": "a42457b72757c64ea3aae8f36f41b3f6b541bcad6caa0ed0b624a31a64719267"}
      ]
    },
    {
      "id": "hydrolakes",
      "version": "v1.0",
      "officialPage": "https://www.hydrosheds.org/products/hydrolakes",
      "license": "CC-BY-4.0",
      "licenseURL": "https://creativecommons.org/licenses/by/4.0/",
      "requiredAttribution": "Messager, M.L., Lehner, B., Grill, G., Nedeva, I., Schmitt, O. (2016): Estimating the volume and age of water stored in global lakes using a geo-statistical approach. Nature Communications: 13603. doi: 10.1038/ncomms13603. Data is available at www.hydrosheds.org.",
      "actualUse": "Aggregate lake-candidate corroboration only; no per-record geometry, classification or recommendation field",
      "url": "https://data.hydrosheds.org/file/hydrolakes/HydroLAKES_polys_v10_shp.zip",
      "bytes": 820295132,
      "sha256": "9ef63498569dd7ccd0b8d8852da026e009a75f42d293f00e483f3b9fcfe8e1f9",
      "modifications": "clipped to pilot bounding boxes before corroboration"
    }
  ]
}