{
  "checked": "2026-10-15",
  "provider": "Lands Department / HKSAR Government",
  "documentation": "https://portal.csdi.gov.hk/csdi-webpage/apidoc/ImageryMapAPI",
  "terms": "https://portal.csdi.gov.hk/csdi-webpage/doc/TNC",
  "disclaimer": "https://api.portal.hkmapservice.gov.hk/disclaimer",
  "endpoint": "https://mapapi.geodata.gov.hk/gs/api/v1.0.0/xyz/imagery/WGS84/{z}/{x}/{y}.png",
  "tileSize": 256,
  "minzoom": 0,
  "maxzoom": 20,
  "mode": "Adaptive aerial 3D; 2D atlas for Save-Data, slow links or reported low-memory/low-core devices; stored choice takes precedence. Progressive viewport imagery, with a coarse z10 layer retained under full detail. Sidebar previews use at most two concurrent requests, one with Save-Data. No bulk or offline imagery download.",
  "reuseBasis": "CSDI terms allow free commercial and non-commercial reproduction with ownership and source acknowledgement. Sidebar views use ordinary unmodified tiles in a cropped map viewport, carrying the required logo and credit.",
  "attribution": "Aerial Photograph from Lands Department; © HKSAR Government; CSDI",
  "logoSource": "https://api.hkmapservice.gov.hk/mapapi/landsdlogo.jpg",
  "testedTiles": [
    "17/107104/57177.png",
    "13/6688/3576.png",
    "15/26799/14276.png",
    "14/13392/7156.png"
  ],
  "observedResponse": {
    "status": 200,
    "type": "image/png",
    "cors": "*",
    "cacheControl": "private, must-revalidate, max-age=43200"
  },
  "limitations": [
    "Imagery is not live. Per-location acquisition date and native resolution are not supplied by the XYZ service. HTTP Last-Modified is not a capture date.",
    "No claim that XYZ tiles use one uniform TDOP release. DOP5000 was superseded by TDOP in January 2024.",
    "Outside Hong Kong, lower-resolution satellite composites have different stated dates and source acknowledgements.",
    "Island preview uses generalised bounds where available, otherwise a reference-point neighbourhood. It is not an island-boundary or landing-access survey."
  ],
  "tdopForFutureDatedImagery": {
    "url": "https://portal.csdi.gov.hk/csdi-webpage/metadata/landsd_rcd_1701762716904_4826/html",
    "fields": [
      "SHEETNO",
      "YEAR_OF_RELEASE",
      "DATE_OF_PHOTOGRAPH",
      "DOWNLOAD_LINK"
    ],
    "note": "The FeatureServer/WMS is a sheet index, not the aerial-pixel layer."
  },
  "terminalAudit": "/assets/provenance/terminal-imagery.json"
}