{
  "site_name": "Acme LF (CA)",
  "landfill_id": 36,
  "lat": 38.034,
  "lon": -122.09056,
  "source": "mass_run",
  "measurement": {
    "hard_fail": false,
    "native_srs_label": "UTM10 WGS84 EPSG:32610",
    "epoch_a_date_nominal": "2010",
    "epoch_b_date_nominal": "2018",
    "epoch_dates_independently_verified": true,
    "usable_coverage_pct": 95.7,
    "n_stable_control_cells": 76644,
    "evidence_refs": [
      "epoch_a: kind=ept label='ARRA-CA_SanFranCoast_2010' n_ground_points=1097673 runtime_s=12.2",
      "epoch_b: kind=ept label='USGS_LPC_CA_NoCAL_Wildfires_B5b_2018' n_ground_points=2902274 runtime_s=19.9"
    ],
    "meta": {
      "epoch_a": {
        "runtime_s": 12.2365937699999,
        "n_points": 1097673,
        "text_bytes": 31832535
      },
      "epoch_b": {
        "runtime_s": 19.869607696999992,
        "n_points": 2902274,
        "text_bytes": 84165958
      },
      "grid_nx": 500,
      "grid_ny": 500
    },
    "stable_control_offset_m": -0.0432,
    "stable_control_sigma_m": 0.0907,
    "detection_threshold_m": 0.2722,
    "volume_change_m3": -25.9,
    "uncertainty_m3": 3.3,
    "uncertainty_to_change_ratio": 0.1293,
    "classification": "DECISION_USEFUL_CHANGE_DETECTED",
    "landfill_id": 36,
    "name": "Acme LF",
    "state": "CA",
    "lat": 38.034,
    "lon": -122.09056,
    "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": 0.871,
    "declared_state": "Epoch A (2010) - reference/baseline surface",
    "observed_state": "Epoch B (2018) - current surface",
    "delta": {
      "volume_change_m3": -25.9,
      "uncertainty_m3": 3.3,
      "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='ARRA-CA_SanFranCoast_2010' n_ground_points=1097673 runtime_s=12.2",
        "nominal_date": "2010",
        "dates_independently_verified": true,
        "n_ground_points": 1097673,
        "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": 3.3,
        "rights": "CC-BY 4.0"
      },
      {
        "source": "epoch_b: kind=ept label='USGS_LPC_CA_NoCAL_Wildfires_B5b_2018' n_ground_points=2902274 runtime_s=19.9",
        "nominal_date": "2018",
        "dates_independently_verified": true,
        "n_ground_points": 2902274,
        "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": 3.3,
        "rights": "CC-BY 4.0"
      }
    ],
    "recommended_next_action": "None - result is decisive.",
    "raw_measurement": {
      "hard_fail": false,
      "native_srs_label": "UTM10 WGS84 EPSG:32610",
      "epoch_a_date_nominal": "2010",
      "epoch_b_date_nominal": "2018",
      "epoch_dates_independently_verified": true,
      "usable_coverage_pct": 95.7,
      "n_stable_control_cells": 76644,
      "evidence_refs": [
        "epoch_a: kind=ept label='ARRA-CA_SanFranCoast_2010' n_ground_points=1097673 runtime_s=12.2",
        "epoch_b: kind=ept label='USGS_LPC_CA_NoCAL_Wildfires_B5b_2018' n_ground_points=2902274 runtime_s=19.9"
      ],
      "meta": {
        "epoch_a": {
          "runtime_s": 12.2365937699999,
          "n_points": 1097673,
          "text_bytes": 31832535
        },
        "epoch_b": {
          "runtime_s": 19.869607696999992,
          "n_points": 2902274,
          "text_bytes": 84165958
        },
        "grid_nx": 500,
        "grid_ny": 500
      },
      "stable_control_offset_m": -0.0432,
      "stable_control_sigma_m": 0.0907,
      "detection_threshold_m": 0.2722,
      "volume_change_m3": -25.9,
      "uncertainty_m3": 3.3,
      "uncertainty_to_change_ratio": 0.1293,
      "classification": "DECISION_USEFUL_CHANGE_DETECTED",
      "landfill_id": 36,
      "name": "Acme LF",
      "state": "CA",
      "lat": 38.034,
      "lon": -122.09056,
      "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"
    }
  }
}