{
  "site_name": "Dartmouth LF (MA)",
  "landfill_id": 776,
  "lat": 41.5798,
  "lon": -71.0002,
  "source": "mass_run",
  "measurement": {
    "hard_fail": true,
    "native_srs_label": "UTM19 WGS84 EPSG:32619",
    "epoch_a_date_nominal": "2011",
    "epoch_b_date_nominal": "2021",
    "epoch_dates_independently_verified": true,
    "usable_coverage_pct": 40.4,
    "n_stable_control_cells": 32405,
    "evidence_refs": [
      "epoch_a: kind=ept label='ARRA-LFTNE_Massachusetts_2011' n_ground_points=456641 runtime_s=6.8",
      "epoch_b: kind=ept label='MA_CentralEastern_2_2021' n_ground_points=7827461 runtime_s=38.6"
    ],
    "meta": {
      "epoch_a": {
        "runtime_s": 6.757458057999884,
        "n_points": 456641,
        "text_bytes": 13660048
      },
      "epoch_b": {
        "runtime_s": 38.570439206000174,
        "n_points": 7827461,
        "text_bytes": 232566846
      },
      "grid_nx": 500,
      "grid_ny": 500
    },
    "hard_fail_reason": "puerta de calidad de dato: n_stable_control_cells=32405 (<200) o usable_coverage_pct=40.4 (<50%)",
    "landfill_id": 776,
    "name": "Dartmouth LF",
    "state": "MA",
    "lat": 41.5798,
    "lon": -71.0002,
    "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": "INCONCLUSIVE_LOW_DATA_QUALITY",
    "confidence": null,
    "declared_state": "Epoch A (2011) - reference/baseline surface",
    "observed_state": "Epoch B (2021) - current surface",
    "delta": null,
    "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-LFTNE_Massachusetts_2011' n_ground_points=456641 runtime_s=6.8",
        "nominal_date": "2011",
        "dates_independently_verified": true,
        "n_ground_points": 456641,
        "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": null,
        "rights": "CC-BY 4.0"
      },
      {
        "source": "epoch_b: kind=ept label='MA_CentralEastern_2_2021' n_ground_points=7827461 runtime_s=38.6",
        "nominal_date": "2021",
        "dates_independently_verified": true,
        "n_ground_points": 7827461,
        "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": null,
        "rights": "CC-BY 4.0"
      }
    ],
    "recommended_next_action": "None available automatically today - the L0-L3 sensor escalation ladder (higher-resolution commercial imagery as a last resort) is not built yet. Manually: request a re-measurement with a customer-supplied real polygon via the request-access path, or try a different point if this one has no usable public LiDAR coverage.",
    "raw_measurement": {
      "hard_fail": true,
      "native_srs_label": "UTM19 WGS84 EPSG:32619",
      "epoch_a_date_nominal": "2011",
      "epoch_b_date_nominal": "2021",
      "epoch_dates_independently_verified": true,
      "usable_coverage_pct": 40.4,
      "n_stable_control_cells": 32405,
      "evidence_refs": [
        "epoch_a: kind=ept label='ARRA-LFTNE_Massachusetts_2011' n_ground_points=456641 runtime_s=6.8",
        "epoch_b: kind=ept label='MA_CentralEastern_2_2021' n_ground_points=7827461 runtime_s=38.6"
      ],
      "meta": {
        "epoch_a": {
          "runtime_s": 6.757458057999884,
          "n_points": 456641,
          "text_bytes": 13660048
        },
        "epoch_b": {
          "runtime_s": 38.570439206000174,
          "n_points": 7827461,
          "text_bytes": 232566846
        },
        "grid_nx": 500,
        "grid_ny": 500
      },
      "hard_fail_reason": "puerta de calidad de dato: n_stable_control_cells=32405 (<200) o usable_coverage_pct=40.4 (<50%)",
      "landfill_id": 776,
      "name": "Dartmouth LF",
      "state": "MA",
      "lat": 41.5798,
      "lon": -71.0002,
      "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"
    }
  }
}