{
  "site_name": "Freeport Municipal Landfill #4 (IL)",
  "landfill_id": 2307,
  "lat": 42.2657,
  "lon": -89.6212,
  "source": "mass_run",
  "measurement": {
    "hard_fail": false,
    "native_srs_label": "UTM16 WGS84 EPSG:32616",
    "epoch_a_date_nominal": "2009",
    "epoch_b_date_nominal": "2019",
    "epoch_dates_independently_verified": true,
    "usable_coverage_pct": 94.5,
    "n_stable_control_cells": 73274,
    "evidence_refs": [
      "epoch_a: kind=ept label='USGS_LPC_IL_12_County_Stephenson_Co_2009_LAS_2016' n_ground_points=630563 runtime_s=12.3",
      "epoch_b: kind=ept label='IL_8County_PlusChampaign_B2_2019' n_ground_points=4164752 runtime_s=31.8"
    ],
    "meta": {
      "epoch_a": {
        "runtime_s": 12.33602984800001,
        "n_points": 630563,
        "text_bytes": 19547465
      },
      "epoch_b": {
        "runtime_s": 31.769798530000003,
        "n_points": 4164752,
        "text_bytes": 129107324
      },
      "grid_nx": 500,
      "grid_ny": 500
    },
    "stable_control_offset_m": 0.064,
    "stable_control_sigma_m": 0.1122,
    "detection_threshold_m": 0.3366,
    "volume_change_m3": 4244.4,
    "uncertainty_m3": 14.8,
    "uncertainty_to_change_ratio": 0.0035,
    "classification": "DECISION_USEFUL_CHANGE_DETECTED",
    "landfill_id": 2307,
    "name": "Freeport Municipal Landfill #4",
    "state": "IL",
    "lat": 42.2657,
    "lon": -89.6212,
    "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": 0.997,
    "declared_state": "Epoch A (2009) - reference/baseline surface",
    "observed_state": "Epoch B (2019) - current surface",
    "delta": {
      "volume_change_m3": 4244.4,
      "uncertainty_m3": 14.8,
      "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_IL_12_County_Stephenson_Co_2009_LAS_2016' n_ground_points=630563 runtime_s=12.3",
        "nominal_date": "2009",
        "dates_independently_verified": true,
        "n_ground_points": 630563,
        "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": 14.8,
        "rights": "CC-BY 4.0"
      },
      {
        "source": "epoch_b: kind=ept label='IL_8County_PlusChampaign_B2_2019' n_ground_points=4164752 runtime_s=31.8",
        "nominal_date": "2019",
        "dates_independently_verified": true,
        "n_ground_points": 4164752,
        "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": 14.8,
        "rights": "CC-BY 4.0"
      }
    ],
    "recommended_next_action": "None - result is decisive.",
    "raw_measurement": {
      "hard_fail": false,
      "native_srs_label": "UTM16 WGS84 EPSG:32616",
      "epoch_a_date_nominal": "2009",
      "epoch_b_date_nominal": "2019",
      "epoch_dates_independently_verified": true,
      "usable_coverage_pct": 94.5,
      "n_stable_control_cells": 73274,
      "evidence_refs": [
        "epoch_a: kind=ept label='USGS_LPC_IL_12_County_Stephenson_Co_2009_LAS_2016' n_ground_points=630563 runtime_s=12.3",
        "epoch_b: kind=ept label='IL_8County_PlusChampaign_B2_2019' n_ground_points=4164752 runtime_s=31.8"
      ],
      "meta": {
        "epoch_a": {
          "runtime_s": 12.33602984800001,
          "n_points": 630563,
          "text_bytes": 19547465
        },
        "epoch_b": {
          "runtime_s": 31.769798530000003,
          "n_points": 4164752,
          "text_bytes": 129107324
        },
        "grid_nx": 500,
        "grid_ny": 500
      },
      "stable_control_offset_m": 0.064,
      "stable_control_sigma_m": 0.1122,
      "detection_threshold_m": 0.3366,
      "volume_change_m3": 4244.4,
      "uncertainty_m3": 14.8,
      "uncertainty_to_change_ratio": 0.0035,
      "classification": "DECISION_USEFUL_CHANGE_DETECTED",
      "landfill_id": 2307,
      "name": "Freeport Municipal Landfill #4",
      "state": "IL",
      "lat": 42.2657,
      "lon": -89.6212,
      "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"
    }
  }
}