# U.S. maritime limits and boundaries (lines)

NOAA Office of Coast Survey's U.S. Maritime Limits and Boundaries (v4.0) as lines: the 12 NM territorial sea (`component` = territorial_sea_12nm, 87), the 24 NM contiguous zone (contiguous_zone_24nm, 63) and the 200 NM EEZ and maritime boundaries with neighbours (eez_200nm, 96). Compiled to update the charted limits on NOAA charts: NOT FOR LEGAL USE.

- **Collection**: `noaa_maritime_limits` v1.0.2, 246 features, GeoParquet 1.1 (`places.parquet`) and PMTiles (`places.pmtiles`, layer `noaa_maritime_limits`)
- **Licence**: CC-PDDC - U.S. federal government work (NOAA Office of Coast Survey). The item states: NOT FOR LEGAL USE; created for internal purposes to update charted limits; not the official depiction (see NOAA nautical charts). Surface this next to the data. https://www.copyright.gov/title17/92chap1.html#105
- **Attribution**: Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Office of Coast Survey (OCS). Public domain; not for legal use. Processed by Ocean Metrics.
- **Refresh**: yearly, by `.github/workflows/sync.yml` (re-fetched only when the source's `editingInfo.dataLastEditDate` or record count changed)

## Sources and provenance

| Component | Source | Item | Data last edit | Retrieved | Records | Checksum (sha-256 of payload) |
|---|---|---|---|---|---|---|
| territorial_sea_12nm | https://maritimeboundaries.noaa.gov/arcgis/rest/services/MaritimeBoundaries/US_Maritime_Limits_Boundaries/MapServer/1 | 44f58c599b1e4f7192df9d4d10b7ddcf | not served | 2026-10-16T07:55:36Z | 87 | `6ecf27d1c8c825a6...` |
| contiguous_zone_24nm | https://maritimeboundaries.noaa.gov/arcgis/rest/services/MaritimeBoundaries/US_Maritime_Limits_Boundaries/MapServer/2 | 44f58c599b1e4f7192df9d4d10b7ddcf | not served | 2026-10-16T07:55:38Z | 63 | `87300b73bd2c2a49...` |
| eez_200nm | https://maritimeboundaries.noaa.gov/arcgis/rest/services/MaritimeBoundaries/US_Maritime_Limits_Boundaries/MapServer/3 | 44f58c599b1e4f7192df9d4d10b7ddcf | not served | 2026-10-16T07:55:39Z | 96 | `5ee63d13d4706089...` |

Machine-readable copy: [`provenance.json`](./provenance.json) (also in `collection.json` and the Parquet footer).

## Schema

| Column | Type | Description |
|---|---|---|
| place_id | string | prefixed, unique id (e.g. BOEM:OCS-P 0561, BOEM:PA:SOC, AOA:N1-A) |
| authority | string | organisation that publishes the boundary (BOEM, AOA = NOAA Aquaculture Opportunity Areas) |
| source_id | string | the source layer's own identifier for the feature (lease number, planning-area code, OBJECTID, AOA code) |
| name | string | human-readable name |
| place_type | string | kind of place: lease, planning_area or aoa |
| geom_type | string | geometry type (MultiLineString) |
| status | string | lifecycle status (e.g. active, cancelled, relinquished, settlement_pending, rescinded, draft_proposed, identified) |
| status_source | string | URL that documents the status |
| status_date | string | ISO date (or year) the status took effect or was last confirmed; may be empty |
| status_upstream | string | the source's own status code, verbatim (e.g. BOEM LEASE_STATUS_CD, AREA_STATUS); null when the source has none. may disagree with `status` |
| status_history | string | JSON array of dated status events [{date, value, source, note}], ascending; null when none is logged |
| source_url | string | the service endpoint or download the boundary was fetched from |
| source_date | date32[day] | date of the source's last data edit (retrieval date when the source serves none) |
| retrieved | timestamp[ms, tz=UTC] | UTC time the boundary was fetched |
| version | string | collection release version this row was built for |
| license | string | SPDX identifier of the licence (CC-PDDC = public-domain U.S. government work) |
| attribution | string | credit line to show with the data |
| component | string | which source layer of the collection the row comes from |
| OBJECTID | int64 | native attribute of the source layer (OBJECTID) |
| BOUND_ID | string | native attribute of the source layer (BOUND_ID) |
| REGION | string | native attribute of the source layer (REGION) |
| FEAT_TYPE | string | native attribute of the source layer (FEAT_TYPE) |
| PUB_DATE | timestamp[ms, tz=UTC] | native attribute of the source layer (PUB_DATE) |
| APPRV_DATE | timestamp[ms, tz=UTC] | native attribute of the source layer (APPRV_DATE) |
| LEGAL_AUTH | string | native attribute of the source layer (LEGAL_AUTH) |
| AOR | string | native attribute of the source layer (AOR) |
| NOTE | string | native attribute of the source layer (NOTE) |
| SUPP_INFO | string | native attribute of the source layer (SUPP_INFO) |
| UNILATERAL | double | native attribute of the source layer (UNILATERAL) |
| RULEID | int64 | native attribute of the source layer (RULEID) |
| SHAPE.LEN | double | native attribute of the source layer (SHAPE.LEN) |
| bbox | struct<xmin: double, ymin: double, xmax: double, ymax: double> | GeoParquet bbox-covering column (xmin, ymin, xmax, ymax) |
| geometry | binary | MULTILINESTRING, EPSG:4326, split at +/-180 antimeridian |

Native attributes keep the source layer's names; a native name equal to a gazetteer column ignoring case
(`NAME` vs `name`) is suffixed `_src`.

## Files

| File | Size | Checksum |
|---|---|---|
| places | 3.3 MB | `12200befc5326708...` |
| places-tiles | 269 kB | `12204656fa928a72...` |
| styles/default | 1 kB | `1220076d7d639f08...` |
| provenance | 4 kB | `12208eb4ba1c7a41...` |
| documentation | 0 kB | `1220e3b0c44298fc...` |

## Quick start

```sql
SELECT place_id, name, status, status_date
FROM read_parquet('https://storage.oceanmetrics.io/gazetteer/noaa_maritime_limits/places.parquet')
ORDER BY place_id;
```

## Changes

- **1.0.2**: first release.