{
  "site_name": "Vertedero de Alicante (Fontcalent, Espana)",
  "landfill_id": null,
  "lat": null,
  "lon": null,
  "source": "hand_run",
  "measurement": {
    "hard_fail": false,
    "native_srs_label": "UTM30N ETRS89 (EPSG:25830)",
    "epoch_a_date_nominal": "2009-08_2009-12 (ventana de campana, ver limitacion honesta en docstring)",
    "epoch_b_date_nominal": "2016-08_2017-03 (ventana de campana, ver limitacion honesta en docstring)",
    "epoch_dates_independently_verified": true,
    "usable_coverage_pct": 89.0,
    "n_stable_control_cells": 3074,
    "evidence_refs": [
      "epoch_a: kind=las_files label='ICV-2009-PALI-708-4250+710-4250' n_ground_points=4513718 runtime_s=6.9",
      "epoch_b: kind=las_files label='ICV-2016-PALI-708-4250+710-4250' n_ground_points=3207403 runtime_s=6.2"
    ],
    "meta": {
      "epoch_a": {
        "runtime_s": 6.909349899739027,
        "n_points": 4513718,
        "text_bytes": 139914557
      },
      "epoch_b": {
        "runtime_s": 6.2114779483526945,
        "n_points": 3207403,
        "text_bytes": 99420429
      },
      "grid_nx": 1194,
      "grid_ny": 821
    },
    "stable_control_offset_m": 0.0775,
    "stable_control_sigma_m": 0.1544,
    "detection_threshold_m": 0.4633,
    "volume_change_m3": 1091709.8,
    "uncertainty_m3": 181.8,
    "uncertainty_to_change_ratio": 0.0002,
    "classification": "DECISION_USEFUL_CHANGE_DETECTED",
    "site_note": "Vertedero de Alicante (OSM way 82260483), poligono real, no buffer sintetico",
    "license_note": "CC-BY 4.0, republicacion oficial GVA/ICV de PNOA-LiDAR (dadesobertes.gva.es), alojado en descargas.icv.gva.es - NO via CNIG"
  },
  "verdict": {
    "verdict": "CHANGE_CONFIRMED",
    "confidence": 1.0,
    "declared_state": "Epoch A (2009-08_2009-12 (ventana de campana, ver limitacion honesta en docstring)) - reference/baseline surface",
    "observed_state": "Epoch B (2016-08_2017-03 (ventana de campana, ver limitacion honesta en docstring)) - current surface",
    "delta": {
      "volume_change_m3": 1091709.8,
      "uncertainty_m3": 181.8,
      "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=las_files label='ICV-2009-PALI-708-4250+710-4250' n_ground_points=4513718 runtime_s=6.9",
        "nominal_date": "2009-08_2009-12 (ventana de campana, ver limitacion honesta en docstring)",
        "dates_independently_verified": true,
        "n_ground_points": 4513718,
        "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": 181.8,
        "rights": "CC-BY 4.0"
      },
      {
        "source": "epoch_b: kind=las_files label='ICV-2016-PALI-708-4250+710-4250' n_ground_points=3207403 runtime_s=6.2",
        "nominal_date": "2016-08_2017-03 (ventana de campana, ver limitacion honesta en docstring)",
        "dates_independently_verified": true,
        "n_ground_points": 3207403,
        "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": 181.8,
        "rights": "CC-BY 4.0"
      }
    ],
    "recommended_next_action": "None - result is decisive.",
    "raw_measurement": {
      "hard_fail": false,
      "native_srs_label": "UTM30N ETRS89 (EPSG:25830)",
      "epoch_a_date_nominal": "2009-08_2009-12 (ventana de campana, ver limitacion honesta en docstring)",
      "epoch_b_date_nominal": "2016-08_2017-03 (ventana de campana, ver limitacion honesta en docstring)",
      "epoch_dates_independently_verified": true,
      "usable_coverage_pct": 89.0,
      "n_stable_control_cells": 3074,
      "evidence_refs": [
        "epoch_a: kind=las_files label='ICV-2009-PALI-708-4250+710-4250' n_ground_points=4513718 runtime_s=6.9",
        "epoch_b: kind=las_files label='ICV-2016-PALI-708-4250+710-4250' n_ground_points=3207403 runtime_s=6.2"
      ],
      "meta": {
        "epoch_a": {
          "runtime_s": 6.909349899739027,
          "n_points": 4513718,
          "text_bytes": 139914557
        },
        "epoch_b": {
          "runtime_s": 6.2114779483526945,
          "n_points": 3207403,
          "text_bytes": 99420429
        },
        "grid_nx": 1194,
        "grid_ny": 821
      },
      "stable_control_offset_m": 0.0775,
      "stable_control_sigma_m": 0.1544,
      "detection_threshold_m": 0.4633,
      "volume_change_m3": 1091709.8,
      "uncertainty_m3": 181.8,
      "uncertainty_to_change_ratio": 0.0002,
      "classification": "DECISION_USEFUL_CHANGE_DETECTED",
      "site_note": "Vertedero de Alicante (OSM way 82260483), poligono real, no buffer sintetico",
      "license_note": "CC-BY 4.0, republicacion oficial GVA/ICV de PNOA-LiDAR (dadesobertes.gva.es), alojado en descargas.icv.gva.es - NO via CNIG"
    }
  }
}