{
  "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": "RIV-DEMO-001",
        "geometry": {
          "type": "LineString",
          "coordinates": [
            [
              101.6955,
              3.1518
            ],
            [
              101.6956,
              3.1508
            ],
            [
              101.6957,
              3.1498
            ]
          ]
        },
        "properties": {
          "asset_id": "RIV-DEMO-001",
          "asset_type": "river",
          "name": "Example river segment",
          "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",
          "flow_direction": "coordinate_order_upstream_to_downstream",
          "length_m": 223,
          "typical_width_m": 18.0,
          "roughness_manning_n": 0.035,
          "vertical_datum_id": "DEMO-LOCAL-DATUM",
          "cross_sections": [
            {
              "section_id": "XS-DEMO-001",
              "chainage_m": 111,
              "profile": [
                {
                  "offset_m": 0,
                  "elevation_m": 28.8
                },
                {
                  "offset_m": 3,
                  "elevation_m": 24.0
                },
                {
                  "offset_m": 15,
                  "elevation_m": 24.0
                },
                {
                  "offset_m": 18,
                  "elevation_m": 28.8
                }
              ]
            }
          ],
          "water_level_sensor_ids": [
            "WL-DEMO-001"
          ],
          "downstream_boundary": {
            "type": "external_outlet",
            "boundary_id": "BOUNDARY-DEMO-OUTLET",
            "water_level_series_id": null,
            "status": "requires_verified_boundary_data"
          }
        }
      }
    ]
  },
  "observations": [],
  "forecasts": [],
  "incidents": []
}