NOAA S-57 chart cell
Mississippi River, Atchafalaya River, and Gulf Intracoastal Waterway Alternate Route
US4LA1HI
- Usage band
- Approach · code 4
- Current edition
- 1.1
- Features
- 757
- S-57 layers
- 49
- Published
- Jan 13, 2026
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 30.30000° N
- South
- 30.00000° N
- West
- 91.50000° W
- East
- 91.20000° W
- Center
- 30.15000° N, 91.35000° W
- Bounds area
- 281 sq nm
- Feature density
- 2.6983 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 15.4
- Smallest layer
- 1
- Largest layer
- 182
- Area sq km
- 962
- Features per sq km
- 0.7867
- COALNE Coastline 182
- SLCONS Shoreline construction 78
- RIVERS River 65
- DEPARE Depth area 58
- LNDRGN Land region 57
- DEPCNT Depth contour 30
- SEAARE Sea area 29
- PIPARE 23
- LNDARE Land area 20
- M_QUAL Data quality 20
- BRIDGE 16
- LAKARE 16
- OBSTRN Obstruction 16
- CBLOHD 12
- SOUNDG Sounding 12
- DISMAR 10
- VEGATN 10
- ROADWY 9
- BUAARE 8
- CBLARE 8
Nearby Chart Cells
Approach usage band
Current Edition Files
The NOAA ZIP archive is the upstream source for this chart cell; the other files are Open Ships generated derivatives for web and GIS use.
- Original NOAA ZIP archive https://www.charts.noaa.gov/ENCs/US4LA1HI.zip
- S-57 base cell https://charts.openships.ai/noaa/s57/approach/US4LA1HI/1.1/US4LA1HI.000
- S-57 update 001 https://charts.openships.ai/noaa/s57/approach/US4LA1HI/1.1/US4LA1HI.001
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4LA1HI/1.1/US4LA1HI.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4LA1HI/1.1/US4LA1HI.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4LA1HI/1.1/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 1.1 | Jan 13, 2026 | metadata.json |