{
  "schema_version": "proposed-poc-1.0",
  "data_mode": "synthetic_example",
  "disclaimer": "All asset names, locations, dimensions, thresholds, readings and forecasts are fictional examples of the format. They are not actual DBKL/JPS/MetMalaysia inventory records, sensor readings or forecasts. This is not an official agency API contract.",
  "site": {
    "site_id": "POC-DEMO-DM",
    "name": "Dataran Merdeka — example POC context",
    "status": "proposed_pilot_not_confirmed"
  },
  "metadata": {
    "source_id": "SOURCE-DEMO",
    "source_name": "Synthetic dataset for the POC guide",
    "coordinate_reference": "WGS84",
    "coordinate_order": [
      "longitude",
      "latitude"
    ],
    "timezone": "Asia/Kuala_Lumpur",
    "vertical_datum": {
      "id": "DEMO-LOCAL-DATUM",
      "name": "Fictional local datum; not an official reference level",
      "verified": false
    },
    "null_policy": "null means unknown or unavailable; never replace missing readings with zero",
    "cross_references": "Related asset IDs may be in other examples; use the combined file for all IDs."
  },
  "assets": {
    "type": "FeatureCollection",
    "features": [
      {
        "type": "Feature",
        "id": "CAT-DEMO-001",
        "geometry": {
          "type": "Polygon",
          "coordinates": [
            [
              [
                101.6918,
                3.1498
              ],
              [
                101.6938,
                3.1498
              ],
              [
                101.6938,
                3.1518
              ],
              [
                101.6918,
                3.1518
              ],
              [
                101.6918,
                3.1498
              ]
            ]
          ]
        },
        "properties": {
          "asset_id": "CAT-DEMO-001",
          "asset_type": "catchment",
          "name": "Example catchment",
          "site_id": "POC-DEMO-DM",
          "data_mode": "synthetic_example",
          "data_owner": null,
          "verification_status": "unverified_example",
          "source_id": "SOURCE-DEMO",
          "updated_at": "2026-09-11T14:00:00+08:00",
          "area_m2": 49200,
          "area_basis": "rounded_schematic_polygon_area",
          "impervious_area_percent": 78,
          "mean_slope_percent": 1.2,
          "rainfall_gauge_id": "RG-DEMO-001",
          "outlet_asset_id": "DRN-DEMO-001",
          "runoff_model_parameters": {
            "method": "illustrative_runoff_coefficient",
            "runoff_coefficient": 0.75,
            "travel_time_minutes": 10,
            "calibration_status": "not_calibrated"
          }
        }
      }
    ]
  },
  "observations": [],
  "forecasts": [],
  "incidents": []
}