{
  "site_name": "Sioux Falls Regional Sanitary Landfill (SD)",
  "landfill_id": 2294,
  "lat": 43.5005,
  "lon": -96.93,
  "source": "hand_run",
  "measurement": {
    "hard_fail": true,
    "native_srs_label": "UTM14N NAD83(2011) EPSG:6343",
    "epoch_a_date_nominal": "2008",
    "epoch_b_date_nominal": "2020",
    "epoch_dates_independently_verified": true,
    "usable_coverage_pct": 70.8,
    "n_stable_control_cells": 42219,
    "evidence_refs": [
      "epoch_a: kind=ept label='SD_MinnehahaCo_2008' n_ground_points=420736 runtime_s=4.1",
      "epoch_b: kind=ept label='SD_EasternSD_3_2020' n_ground_points=5420665 runtime_s=20.2"
    ],
    "meta": {
      "epoch_a": {
        "runtime_s": 4.127504300326109,
        "n_points": 420736,
        "text_bytes": 13042828
      },
      "epoch_b": {
        "runtime_s": 20.15352659765631,
        "n_points": 5420665,
        "text_bytes": 168040627
      },
      "grid_nx": 500,
      "grid_ny": 500
    },
    "stable_control_offset_m": 7.113,
    "stable_control_sigma_m": 10.3276,
    "hard_fail_reason": "datum/alineacion: stable_control_sigma_m=10.3276 (>1.0) o |stable_control_offset_m|=7.1130 (>2.0)",
    "site_note": "poligono sintetico (buffer 200x200m sobre coordenada LMOP real), NO el parcel legal exacto"
  },
  "verdict": {
    "verdict": "INCONCLUSIVE_ALIGNMENT_FAILURE",
    "confidence": null,
    "declared_state": "Epoch A (2008) - reference/baseline surface",
    "observed_state": "Epoch B (2020) - 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='SD_MinnehahaCo_2008' n_ground_points=420736 runtime_s=4.1",
        "nominal_date": "2008",
        "dates_independently_verified": true,
        "n_ground_points": 420736,
        "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='SD_EasternSD_3_2020' n_ground_points=5420665 runtime_s=20.2",
        "nominal_date": "2020",
        "dates_independently_verified": true,
        "n_ground_points": 5420665,
        "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": "UTM14N NAD83(2011) EPSG:6343",
      "epoch_a_date_nominal": "2008",
      "epoch_b_date_nominal": "2020",
      "epoch_dates_independently_verified": true,
      "usable_coverage_pct": 70.8,
      "n_stable_control_cells": 42219,
      "evidence_refs": [
        "epoch_a: kind=ept label='SD_MinnehahaCo_2008' n_ground_points=420736 runtime_s=4.1",
        "epoch_b: kind=ept label='SD_EasternSD_3_2020' n_ground_points=5420665 runtime_s=20.2"
      ],
      "meta": {
        "epoch_a": {
          "runtime_s": 4.127504300326109,
          "n_points": 420736,
          "text_bytes": 13042828
        },
        "epoch_b": {
          "runtime_s": 20.15352659765631,
          "n_points": 5420665,
          "text_bytes": 168040627
        },
        "grid_nx": 500,
        "grid_ny": 500
      },
      "stable_control_offset_m": 7.113,
      "stable_control_sigma_m": 10.3276,
      "hard_fail_reason": "datum/alineacion: stable_control_sigma_m=10.3276 (>1.0) o |stable_control_offset_m|=7.1130 (>2.0)",
      "site_note": "poligono sintetico (buffer 200x200m sobre coordenada LMOP real), NO el parcel legal exacto"
    }
  },
  "independent_cross_check": {
    "mass_run_hard_fail": true,
    "mass_run_volume_change_m3": null,
    "mass_run_offset_m": 7.113,
    "mass_run_sigma_m": 10.3276
  }
}