{
  "site_name": "Craven County LF (NC)",
  "landfill_id": 1073,
  "lat": 35.1682,
  "lon": -77.2282,
  "source": "mass_run",
  "measurement": {
    "hard_fail": false,
    "native_srs_label": "UTM18 WGS84 EPSG:32618",
    "epoch_a_date_nominal": "2014",
    "epoch_b_date_nominal": "2020",
    "epoch_dates_independently_verified": true,
    "usable_coverage_pct": 86.7,
    "n_stable_control_cells": 73149,
    "evidence_refs": [
      "epoch_a: kind=ept label='USGS_LPC_NC_Sandy_L12_2014_LAS_2015' n_ground_points=1014511 runtime_s=20.0",
      "epoch_b: kind=ept label='NC_HurricaneFlorence_10_2020' n_ground_points=9162914 runtime_s=61.2"
    ],
    "meta": {
      "epoch_a": {
        "runtime_s": 19.958497098000407,
        "n_points": 1014511,
        "text_bytes": 30435342
      },
      "epoch_b": {
        "runtime_s": 61.171428896999714,
        "n_points": 9162914,
        "text_bytes": 274887432
      },
      "grid_nx": 500,
      "grid_ny": 500
    },
    "stable_control_offset_m": 0.0621,
    "stable_control_sigma_m": 0.0604,
    "detection_threshold_m": 0.1812,
    "volume_change_m3": -161.5,
    "uncertainty_m3": 6.2,
    "uncertainty_to_change_ratio": 0.0381,
    "classification": "DECISION_USEFUL_CHANGE_DETECTED",
    "landfill_id": 1073,
    "name": "Craven County LF",
    "state": "NC",
    "lat": 35.1682,
    "lon": -77.2282,
    "site_note": "poligono sintetico (buffer 200x200m sobre coordenada LMOP real), NO el parcel legal exacto",
    "datum_note": "UTM WGS84, no NAD83(2011) especifico por estado - ver docstring de lmop_mass_runner.py"
  },
  "verdict": {
    "verdict": "CHANGE_CONFIRMED",
    "confidence": 0.962,
    "declared_state": "Epoch A (2014) - reference/baseline surface",
    "observed_state": "Epoch B (2020) - current surface",
    "delta": {
      "volume_change_m3": -161.5,
      "uncertainty_m3": 6.2,
      "unit": "m3"
    },
    "sensor_agreement": {
      "status": "not_applicable_single_sensor",
      "note": "physical_change compares two epochs of the same sensor modality (LiDAR vs. LiDAR) - there is no second independent sensor to cross-check against today, unlike china_industrial_reality's multi-signal (NDVI/NDBI/SAR) discipline. The stable_control_offset_m/stable_control_sigma_m fields are a real internal consistency check (calibration against known-stable ground), not a second sensor."
    },
    "evidence": [
      {
        "source": "epoch_a: kind=ept label='USGS_LPC_NC_Sandy_L12_2014_LAS_2015' n_ground_points=1014511 runtime_s=20.0",
        "nominal_date": "2014",
        "dates_independently_verified": true,
        "n_ground_points": 1014511,
        "hash": null,
        "hash_note": "No cryptographic hash of the source point cloud is computed today - real gap, not hidden.",
        "method_version": "measure_physical_change (unmodified core function across all 4 validated sites)",
        "uncertainty_m3": 6.2,
        "rights": "CC-BY 4.0"
      },
      {
        "source": "epoch_b: kind=ept label='NC_HurricaneFlorence_10_2020' n_ground_points=9162914 runtime_s=61.2",
        "nominal_date": "2020",
        "dates_independently_verified": true,
        "n_ground_points": 9162914,
        "hash": null,
        "hash_note": "No cryptographic hash of the source point cloud is computed today - real gap, not hidden.",
        "method_version": "measure_physical_change (unmodified core function across all 4 validated sites)",
        "uncertainty_m3": 6.2,
        "rights": "CC-BY 4.0"
      }
    ],
    "recommended_next_action": "None - result is decisive.",
    "raw_measurement": {
      "hard_fail": false,
      "native_srs_label": "UTM18 WGS84 EPSG:32618",
      "epoch_a_date_nominal": "2014",
      "epoch_b_date_nominal": "2020",
      "epoch_dates_independently_verified": true,
      "usable_coverage_pct": 86.7,
      "n_stable_control_cells": 73149,
      "evidence_refs": [
        "epoch_a: kind=ept label='USGS_LPC_NC_Sandy_L12_2014_LAS_2015' n_ground_points=1014511 runtime_s=20.0",
        "epoch_b: kind=ept label='NC_HurricaneFlorence_10_2020' n_ground_points=9162914 runtime_s=61.2"
      ],
      "meta": {
        "epoch_a": {
          "runtime_s": 19.958497098000407,
          "n_points": 1014511,
          "text_bytes": 30435342
        },
        "epoch_b": {
          "runtime_s": 61.171428896999714,
          "n_points": 9162914,
          "text_bytes": 274887432
        },
        "grid_nx": 500,
        "grid_ny": 500
      },
      "stable_control_offset_m": 0.0621,
      "stable_control_sigma_m": 0.0604,
      "detection_threshold_m": 0.1812,
      "volume_change_m3": -161.5,
      "uncertainty_m3": 6.2,
      "uncertainty_to_change_ratio": 0.0381,
      "classification": "DECISION_USEFUL_CHANGE_DETECTED",
      "landfill_id": 1073,
      "name": "Craven County LF",
      "state": "NC",
      "lat": 35.1682,
      "lon": -77.2282,
      "site_note": "poligono sintetico (buffer 200x200m sobre coordenada LMOP real), NO el parcel legal exacto",
      "datum_note": "UTM WGS84, no NAD83(2011) especifico por estado - ver docstring de lmop_mass_runner.py"
    }
  }
}