{
  "site_name": "Holdrege Prairie Hill Landfill (NE)",
  "landfill_id": 1751,
  "lat": 40.418,
  "lon": -99.374,
  "source": "mass_run",
  "measurement": {
    "hard_fail": false,
    "native_srs_label": "UTM14 WGS84 EPSG:32614",
    "epoch_a_date_nominal": "2009",
    "epoch_b_date_nominal": "2018",
    "epoch_dates_independently_verified": true,
    "usable_coverage_pct": 82.4,
    "n_stable_control_cells": 76872,
    "evidence_refs": [
      "epoch_a: kind=ept label='NE_Rainwater-2_2009' n_ground_points=347215 runtime_s=6.1",
      "epoch_b: kind=ept label='NE_SouthernNE_B3_2018' n_ground_points=4211246 runtime_s=21.9"
    ],
    "meta": {
      "epoch_a": {
        "runtime_s": 6.087144735000038,
        "n_points": 347215,
        "text_bytes": 10763677
      },
      "epoch_b": {
        "runtime_s": 21.85505420100003,
        "n_points": 4211246,
        "text_bytes": 130548638
      },
      "grid_nx": 500,
      "grid_ny": 500
    },
    "stable_control_offset_m": -0.0086,
    "stable_control_sigma_m": 0.1186,
    "detection_threshold_m": 0.3558,
    "volume_change_m3": 67260.0,
    "uncertainty_m3": 39.9,
    "uncertainty_to_change_ratio": 0.0006,
    "classification": "DECISION_USEFUL_CHANGE_DETECTED",
    "landfill_id": 1751,
    "name": "Holdrege Prairie Hill Landfill",
    "state": "NE",
    "lat": 40.418,
    "lon": -99.374,
    "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": 0.999,
    "declared_state": "Epoch A (2009) - reference/baseline surface",
    "observed_state": "Epoch B (2018) - current surface",
    "delta": {
      "volume_change_m3": 67260.0,
      "uncertainty_m3": 39.9,
      "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='NE_Rainwater-2_2009' n_ground_points=347215 runtime_s=6.1",
        "nominal_date": "2009",
        "dates_independently_verified": true,
        "n_ground_points": 347215,
        "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": 39.9,
        "rights": "CC-BY 4.0"
      },
      {
        "source": "epoch_b: kind=ept label='NE_SouthernNE_B3_2018' n_ground_points=4211246 runtime_s=21.9",
        "nominal_date": "2018",
        "dates_independently_verified": true,
        "n_ground_points": 4211246,
        "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": 39.9,
        "rights": "CC-BY 4.0"
      }
    ],
    "recommended_next_action": "None - result is decisive.",
    "raw_measurement": {
      "hard_fail": false,
      "native_srs_label": "UTM14 WGS84 EPSG:32614",
      "epoch_a_date_nominal": "2009",
      "epoch_b_date_nominal": "2018",
      "epoch_dates_independently_verified": true,
      "usable_coverage_pct": 82.4,
      "n_stable_control_cells": 76872,
      "evidence_refs": [
        "epoch_a: kind=ept label='NE_Rainwater-2_2009' n_ground_points=347215 runtime_s=6.1",
        "epoch_b: kind=ept label='NE_SouthernNE_B3_2018' n_ground_points=4211246 runtime_s=21.9"
      ],
      "meta": {
        "epoch_a": {
          "runtime_s": 6.087144735000038,
          "n_points": 347215,
          "text_bytes": 10763677
        },
        "epoch_b": {
          "runtime_s": 21.85505420100003,
          "n_points": 4211246,
          "text_bytes": 130548638
        },
        "grid_nx": 500,
        "grid_ny": 500
      },
      "stable_control_offset_m": -0.0086,
      "stable_control_sigma_m": 0.1186,
      "detection_threshold_m": 0.3558,
      "volume_change_m3": 67260.0,
      "uncertainty_m3": 39.9,
      "uncertainty_to_change_ratio": 0.0006,
      "classification": "DECISION_USEFUL_CHANGE_DETECTED",
      "landfill_id": 1751,
      "name": "Holdrege Prairie Hill Landfill",
      "state": "NE",
      "lat": 40.418,
      "lon": -99.374,
      "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"
    }
  }
}