{
  "site_name": "Tower Landfill Inc. (Denver metro, CO)",
  "landfill_id": 1716,
  "lat": 39.85052,
  "lon": -104.77187,
  "source": "hand_run",
  "measurement": {
    "hard_fail": false,
    "native_srs_label": "UTM13N NAD83(2011) EPSG:6342",
    "epoch_a_date_nominal": "2013",
    "epoch_b_date_nominal": "2020",
    "epoch_dates_independently_verified": true,
    "usable_coverage_pct": 98.1,
    "n_stable_control_cells": 82777,
    "evidence_refs": [
      "epoch_a: kind=ept label='USGS_LPC_CO_SoPlatteRiver_Lot5_2013_LAS_2015' n_ground_points=2087586 runtime_s=12.8",
      "epoch_b: kind=ept label='CO_DRCOG_2_2020' n_ground_points=2635897 runtime_s=11.7"
    ],
    "meta": {
      "epoch_a": {
        "runtime_s": 12.777465792372823,
        "n_points": 2087586,
        "text_bytes": 66802764
      },
      "epoch_b": {
        "runtime_s": 11.666452030651271,
        "n_points": 2635897,
        "text_bytes": 84348716
      },
      "grid_nx": 500,
      "grid_ny": 500
    },
    "stable_control_offset_m": 0.0259,
    "stable_control_sigma_m": 0.0925,
    "detection_threshold_m": 0.2774,
    "volume_change_m3": 8072.6,
    "uncertainty_m3": 19.6,
    "uncertainty_to_change_ratio": 0.0024,
    "classification": "DECISION_USEFUL_CHANGE_DETECTED",
    "site_note": "poligono sintetico (buffer 200x200m sobre coordenada LMOP real), NO el parcel legal exacto"
  },
  "verdict": {
    "verdict": "CHANGE_CONFIRMED",
    "confidence": 0.998,
    "declared_state": "Epoch A (2013) - reference/baseline surface",
    "observed_state": "Epoch B (2020) - current surface",
    "delta": {
      "volume_change_m3": 8072.6,
      "uncertainty_m3": 19.6,
      "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_CO_SoPlatteRiver_Lot5_2013_LAS_2015' n_ground_points=2087586 runtime_s=12.8",
        "nominal_date": "2013",
        "dates_independently_verified": true,
        "n_ground_points": 2087586,
        "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": 19.6,
        "rights": "CC-BY 4.0"
      },
      {
        "source": "epoch_b: kind=ept label='CO_DRCOG_2_2020' n_ground_points=2635897 runtime_s=11.7",
        "nominal_date": "2020",
        "dates_independently_verified": true,
        "n_ground_points": 2635897,
        "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": 19.6,
        "rights": "CC-BY 4.0"
      }
    ],
    "recommended_next_action": "None - result is decisive.",
    "raw_measurement": {
      "hard_fail": false,
      "native_srs_label": "UTM13N NAD83(2011) EPSG:6342",
      "epoch_a_date_nominal": "2013",
      "epoch_b_date_nominal": "2020",
      "epoch_dates_independently_verified": true,
      "usable_coverage_pct": 98.1,
      "n_stable_control_cells": 82777,
      "evidence_refs": [
        "epoch_a: kind=ept label='USGS_LPC_CO_SoPlatteRiver_Lot5_2013_LAS_2015' n_ground_points=2087586 runtime_s=12.8",
        "epoch_b: kind=ept label='CO_DRCOG_2_2020' n_ground_points=2635897 runtime_s=11.7"
      ],
      "meta": {
        "epoch_a": {
          "runtime_s": 12.777465792372823,
          "n_points": 2087586,
          "text_bytes": 66802764
        },
        "epoch_b": {
          "runtime_s": 11.666452030651271,
          "n_points": 2635897,
          "text_bytes": 84348716
        },
        "grid_nx": 500,
        "grid_ny": 500
      },
      "stable_control_offset_m": 0.0259,
      "stable_control_sigma_m": 0.0925,
      "detection_threshold_m": 0.2774,
      "volume_change_m3": 8072.6,
      "uncertainty_m3": 19.6,
      "uncertainty_to_change_ratio": 0.0024,
      "classification": "DECISION_USEFUL_CHANGE_DETECTED",
      "site_note": "poligono sintetico (buffer 200x200m sobre coordenada LMOP real), NO el parcel legal exacto"
    }
  },
  "independent_cross_check": {
    "mass_run_hard_fail": false,
    "mass_run_volume_change_m3": 8421.3,
    "mass_run_offset_m": 0.0561,
    "mass_run_sigma_m": 0.1017
  }
}