{
  "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": "DRN-DEMO-001",
        "geometry": {
          "type": "LineString",
          "coordinates": [
            [
              101.6928,
              3.1502
            ],
            [
              101.6936,
              3.1502
            ]
          ]
        },
        "properties": {
          "asset_id": "DRN-DEMO-001",
          "asset_type": "drain",
          "name": "Example drain A",
          "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",
          "upstream_catchment_id": "CAT-DEMO-001",
          "downstream_asset_id": "CUL-DEMO-001",
          "flow_direction": "coordinate_order_upstream_to_downstream",
          "length_m": 89,
          "section_shape": "rectangular",
          "width_m": 1.2,
          "internal_depth_m": 1.0,
          "material": "concrete",
          "roughness_manning_n": 0.015,
          "vertical_datum_id": "DEMO-LOCAL-DATUM",
          "upstream_invert_elevation_m": 25.6,
          "downstream_invert_elevation_m": 25.2
        }
      }
    ]
  },
  "observations": [
    {
      "observation_id": "OBS-DEMO-DRN-001",
      "asset_id": "DRN-DEMO-001",
      "source_record_id": "OBS-DEMO-DRN-001",
      "source_id": "SOURCE-DEMO",
      "observed_at": "2026-09-11T14:00:00+08:00",
      "received_at": "2026-09-11T14:00:05+08:00",
      "data_mode": "synthetic_example",
      "quality_flag": "example_unverified",
      "measurements": {
        "blockage_estimate": {
          "value": 20,
          "unit": "percent",
          "method": "visual_estimate"
        },
        "sediment_depth": {
          "value": 0.1,
          "unit": "m"
        }
      },
      "observation_type": "field_inspection",
      "condition": "requires_cleaning"
    }
  ],
  "forecasts": [],
  "incidents": []
}