{
  "parcel_source": {
    "county": "Suffolk",
    "state": "MA",
    "fips": "25025",
    "epsg": 26919,
    "town_ids": [
      35,
      57,
      248,
      346
    ],
    "retain_source_keys": true,
    "title": "Suffolk County, Massachusetts property research",
    "source": "https://www.mass.gov/info-details/massgis-data-property-tax-parcels",
    "license": "https://www.mass.gov/info-details/massgis-frequently-asked-questions",
    "license_note": "MassGIS states publicly funded data are in the public domain and may be used for any purpose.",
    "attribution": "MassGIS (Bureau of Geographic Information), Commonwealth of Massachusetts EOTSS; originating municipal assessors",
    "vintage": "Official MassGIS snapshot retrieved 2026-09-23. Assessment fiscal year is retained per record and varies by municipality; retrieval does not certify current ownership. Snapshot parcel_id contains source OBJECTID and is not a persistent cross-vintage identifier. Town, assessment-property, LOC_ID and map-parcel identifiers are retained for reviewed joins."
  },
  "exported_at_utc": "2026-09-23T18:14:55.491482+00:00",
  "projection": "EPSG:26919",
  "enrichment_sources": [
    {
      "source": {
        "url": "https://msc.fema.gov/portal/downloadProduct?productTypeID=NFHL&productSubTypeID=NFHL_STATE_DATA&productID=NFHL_25_20260910",
        "product_id": "NFHL_25_20260910",
        "archive_sha256": "bb2e9506b8ba522f83db27ef0c3d444aae7f385e2caab42302e3839287ddf3a0",
        "layer": "S_FLD_HAZ_AR",
        "native_crs": "EPSG:4269",
        "output_crs": "EPSG:4326",
        "transformation": "NAD_1983_To_WGS_1984_5; Esri WKID1515; published accuracy 1 metre",
        "transformation_pipeline": "+proj=pipeline +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=cart +ellps=GRS80 +step +proj=helmert +x=-0.991 +y=1.9072 +z=0.5129 +rx=-0.02578991 +ry=-0.00965010 +rz=-0.01165994 +s=0 +convention=coordinate_frame +step +inv +proj=cart +ellps=WGS84 +step +proj=unitconvert +xy_in=rad +xy_out=deg",
        "latest_study_effective_date": "2026-06-23",
        "latest_lomr_effective_date": "2026-09-11",
        "query_bbox_wgs84": [
          -71.19590512144059,
          42.2229197968072,
          -70.86365365873371,
          42.4551263401079
        ],
        "conservative_native_bbox": [
          -71.1969051214406,
          42.2219197968072,
          -70.8626536587337,
          42.4561263401079
        ],
        "scope": "Dated complete Massachusetts FEMA state download; complete polygons selected from the state archive. No clipping, simplification, inferred coverage or substitution of omitted features. Source OBJECTID is the archive row identifier, not the REST service OBJECTID.",
        "bulk_validation": {
          "passed": true,
          "state_archive_rows_reconciled": 54309,
          "selected_features": 2668,
          "selected_ids_reconciled": true,
          "native_invalid_geometries": 6,
          "coordinate_roundtrip_checks": 20,
          "independent_live_rest_native_geometry_controls": [
            {
              "rest_object_id": 25948297,
              "gfid": "2cc66695-f04e-492f-8ce6-f65aa220ee98",
              "all_shared_attributes_matched": 19,
              "native_extent_area_perimeter_matched": true
            },
            {
              "rest_object_id": 26380939,
              "gfid": "f80a7da4-77f9-4f78-9594-1ed456d6f84d",
              "all_shared_attributes_matched": 19,
              "native_extent_area_perimeter_matched": true
            }
          ]
        }
      },
      "retrieved_at_utc": "2026-09-23T19:24:25.324480+00:00",
      "features": 2668,
      "overlay_geometries_repaired": 6
    },
    {
      "source": {
        "key": "ma-nantucket-schools-wide",
        "url": "https://nces.ed.gov/opengis/rest/services/K12_School_Locations/EDGE_ADMINDATA_PUBLICSCH_2425/MapServer/1",
        "where": "LSTATE='MA' AND STATUS <> '2' AND VIRTUAL <> 'Virtual school'",
        "fields": "OBJECTID,NCESSCH,SURVYEAR,SCH_NAME,GSLO,GSHI,STATUS,VIRTUAL,LSTATE"
      },
      "retrieved_at_utc": "2026-09-22T15:35:17.839235+00:00",
      "features": 1814,
      "overlay_geometries_repaired": 0
    },
    {
      "source": {
        "url": "https://tigerweb.geo.census.gov/arcgis/rest/services/TIGERweb/tigerWMS_ACS2024/MapServer/14",
        "where": "STATE='25'",
        "bbox": [
          -71.19590512144059,
          42.2229197968072,
          -70.86365365873371,
          42.4551263401079
        ]
      },
      "retrieved_at_utc": "2026-09-23T18:25:36.132267+00:00",
      "features": 34,
      "overlay_geometries_repaired": 0
    }
  ],
  "county_validation_source": {
    "source": {
      "url": "https://tigerweb.geo.census.gov/arcgis/rest/services/TIGERweb/tigerWMS_ACS2024/MapServer/82",
      "where": "GEOID='25025'",
      "bbox": null
    },
    "retrieved_at_utc": "2026-09-23T18:25:22.893945+00:00"
  },
  "county_boundary_review": {
    "main_records": 208724,
    "source_records": 208740,
    "excluded_records": 16,
    "review_file": "excluded-source-records.json",
    "source_geometry_unchanged": true
  },
  "nwi_update": {
    "acquisition": {
      "url": "https://documentst.ecosphere.fws.gov/wetlands/data/State-Downloads/MA_geopackage_wetlands.zip",
      "listing_url": "https://www.fws.gov/program/national-wetlands-inventory/download-state-wetlands-data",
      "bytes": 251877122,
      "sha256": "85fdd29675fc9514db98109a8160d521de2bb11355bc6c2d45ca25c24d0f9b82",
      "last_modified": "Wed, 29 Apr 2026 16:18:10 GMT",
      "retrieved_at_utc": "2026-09-23T18:24:48.580226+00:00",
      "limitations_url": "https://www.fws.gov/page/national-wetlands-inventory-frequently-asked-questions",
      "crc_passed": true,
      "method": "Official complete Massachusetts GeoPackage, May 2026 release. Spatial index subset against county bounding box plus 500m. Project coverage clipped to the union of all state footprint features."
    },
    "projection": "EPSG:5070",
    "retrieved_polygon_count": 6525,
    "project_footprints": [
      {
        "PROJECT_NAME": "Eastern Massachusetts",
        "STATUS": "Digital",
        "SUPPMAPINFO": "https://documentst.ecosphere.fws.gov/wetlands/data/SupMapInf/R09Y05P22.pdf",
        "FGDC_METADATA": "https://documentst.ecosphere.fws.gov/wetlands/data/metadata/FWS_Wetlands_Project_Metadata.xml",
        "IMAGE_YR": 1995,
        "IMAGE_DATE": "xx/92, xx/95",
        "IMAGE_SCALE": 40000,
        "ALL_SCALES": "1:40,000",
        "EMULSION": "CIR, BW",
        "COMMENTS": "None;  NWI Version 2 derived by supplementing single-line stream features not mapped by the NWI with NHD 931v210.",
        "SOURCE_TYPE": "CIR"
      },
      {
        "PROJECT_NAME": "Ma Northern Cooter Habitat (1 of 2)",
        "STATUS": "Digital",
        "SUPPMAPINFO": "https://documentst.ecosphere.fws.gov/wetlands/data/SupMapInf/R05Y04P08.pdf",
        "FGDC_METADATA": "https://documentst.ecosphere.fws.gov/wetlands/data/metadata/FWS_Wetlands_Project_Metadata.xml",
        "IMAGE_YR": 1995,
        "IMAGE_DATE": "04/92, 04/95",
        "IMAGE_SCALE": 40000,
        "ALL_SCALES": "1:40000",
        "EMULSION": "CIR, BW",
        "COMMENTS": "NWI Version 2 derived by supplementing single-line stream features not mapped by the NWI with NHD 931v220.",
        "SOURCE_TYPE": "CIR"
      },
      {
        "PROJECT_NAME": "Boston Harbor",
        "STATUS": "Digital",
        "SUPPMAPINFO": "https://documentst.ecosphere.fws.gov/wetlands/data/SupMapInf/R05Y04P06.pdf",
        "FGDC_METADATA": "https://documentst.ecosphere.fws.gov/wetlands/data/metadata/FWS_Wetlands_Project_Metadata.xml",
        "IMAGE_YR": 1992,
        "IMAGE_DATE": "04/91, 04/92",
        "IMAGE_SCALE": 40000,
        "ALL_SCALES": "1:40000",
        "EMULSION": "CIR",
        "COMMENTS": "NWI Version 2 derived by supplementing single-line stream features not mapped by the NWI with NHD 931v220.",
        "SOURCE_TYPE": "CIR"
      },
      {
        "PROJECT_NAME": "ALL WATER",
        "STATUS": "Digital",
        "SUPPMAPINFO": "None",
        "FGDC_METADATA": "https://documentst.ecosphere.fws.gov/wetlands/data/metadata/FWS_Wetlands_Project_Metadata.xml",
        "IMAGE_YR": 2000,
        "IMAGE_DATE": "xx/00",
        "IMAGE_SCALE": 1,
        "ALL_SCALES": "1 Meter",
        "EMULSION": "TC",
        "COMMENTS": "All Water",
        "SOURCE_TYPE": "TC"
      },
      {
        "PROJECT_NAME": "Rapid Coastal Update",
        "STATUS": "Digital",
        "SUPPMAPINFO": "https://documentst.ecosphere.fws.gov/wetlands/data/SupMapInf/R05Y13P13.pdf",
        "FGDC_METADATA": "https://documentst.ecosphere.fws.gov/wetlands/data/metadata/FWS_Wetlands_Project_Metadata.xml",
        "IMAGE_YR": 2008,
        "IMAGE_DATE": "xx/08,xx/09,xx10,xx/11",
        "IMAGE_SCALE": 1,
        "ALL_SCALES": "1 Meter",
        "EMULSION": "TC",
        "COMMENTS": "NWI Version 2 derived by supplementing single-line stream features not mapped by the NWI with NHD 931v220.",
        "SOURCE_TYPE": "TC"
      }
    ],
    "overlay_geometries_repaired": 0,
    "base_archive_sha256": "f33bb53c3636194ad1ee07f720d6aaf3e8cf6633e06131477dcf50f4aa4335c3",
    "limitations": "Biological mapping, not regulatory jurisdiction or a determination of wetland absence.",
    "at_utc": "2026-09-23T19:55:22.200678+00:00"
  },
  "assessment_update": {
    "original_records": 208724,
    "current_source_records": 184552,
    "current_assessment_years": {
      "2026": 184552
    },
    "original_record_match_counts": {
      "outside_boston_scope": 28266,
      "owner_text_changed": 32195,
      "mailing_text_changed": 65937,
      "assessed_total_value_changed": 156713,
      "unique_exact_source_key": 179854,
      "owner_mail_review_queue": 72155,
      "no_current_pid_match": 580,
      "map_key_differs_or_missing": 7,
      "original_key_incomplete": 17
    },
    "matched_original_assessment_years": {
      "2023": 179854
    },
    "current_records_without_unique_original_match": 4698,
    "retrieved_at_utc": "2026-09-23T19:58:14.691550+00:00",
    "source_url": "https://data.boston.gov/dataset/e02c44d2-3c64-459c-8fe2-e1ce5f38a035/resource/ee73430d-96c0-423e-ad21-c4cfb54c8961/download/fy2026-property-assessment-data_rev.csv",
    "source_sha256": "d0b656f516162c56a92782a255c731b967bd551b3e26cf412e080fdf041791fa",
    "license_url": "http://www.opendefinition.org/licenses/odc-pddl",
    "license_id": "odc-pddl",
    "attribution": "City of Boston, Assessing Department; Property Assessment FY2026, revision published May 22, 2026.",
    "source_provider": "City of Boston",
    "source_formats": "CSV (attributes only; no new geometry)",
    "current_geometry_supplied": false,
    "scope": "Boston only (MassGIS TOWN_ID 35), not all Suffolk County municipalities. Other municipalities remain outside this comparison.",
    "match_key": "MassGIS TOWN_ID 35 + PROP_ID = Boston PID + MAP_PAR_ID = Boston GIS_ID. Both identifiers must match exactly, allowing only the documented trailing underscore on Boston identifier strings. Leading zeros are preserved.",
    "method": "Unique source keys only; both original and current matches checked for uniqueness. No address, name, fuzzy, spatial or padded-number matching. Incomplete identifiers, unmatched PIDs and map-key discrepancies remain unresolved. All original records remain in the review CSV. The separate source-location exceptions remain included unchanged.",
    "change_semantics": "Owner and mailing differences are text changes, including formatting changes, not confirmed sales, legal title, delivery validation or seller intent. Monetary comparisons ignore commas and decimal formatting; assessment differences are not market appreciation or tax bills. A zero original assessed total has no percentage difference. FY2026 is an assessment year, not current ownership verification.",
    "current_unmatched_semantics": "Current records without a unique original match are a reconciliation queue, not necessarily newly created parcels.",
    "catalog_vintage": "Mixed source fiscal years + Boston-only FY2026 assessment review",
    "dictionary_url": "https://data.boston.gov/dataset/e02c44d2-3c64-459c-8fe2-e1ce5f38a035/resource/440f72b7-bb2c-4c37-971f-c1097d155559/download/property-assessment-fy2026-data-key.pdf"
  }
}