S57 Nautical Charts to GeoJSON
Convert S57 Nautical Charts files to GeoJSON format
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About S57 Nautical Charts
S-57 is the IHO (International Hydrographic Organization) standard for digital nautical charts and hydrographic data. S-57 files (.000) contain chart objects such as depth contours, soundings, buoys, and coastlines as defined by the IHO Object Catalogue, and are the authoritative format for electronic navigational charts (ENCs).
You might convert from S-57 when you need to display nautical chart features in a general-purpose GIS, when analysing hydrographic data alongside other spatial datasets, or when extracting specific chart objects such as depth soundings or hazard markers for further processing.
Frequently asked questions
What chart objects are available in S-57 files?
S-57 files contain many object classes including SOUNDG (soundings), DEPCNT (depth contours), buoys, lights, coastlines, and more. Each object class is converted to a separate layer in the output.
Can I convert an ENC cell to GeoJSON?
Yes — each S-57 object class becomes a layer. When converting to GeoJSON, you can select which object class layer to export during the conversion process.
What is the coordinate reference system of S-57 data?
S-57 data uses WGS 84 geographic coordinates, so no reprojection is needed for most web mapping use cases.
More S57 Nautical Charts Conversions
Convert S57 Nautical Charts files to other popular formats
to KML
.kml
to Shapefile
.zip
to CSV
.csv
to GPX
.gpx
to GeoPackage
.gpkg
to FlatGeobuf
.fgb
to JSON-FG
.json
to MVT
.mvt
to PostgreSQL Dump
.sql
to PMTiles
.pmtiles
to MBTiles
.mbtiles
to DXF
.dxf
to PDF
to GML
.gml
to Excel (XLSX)
.xlsx
to OpenDocument Spreadsheet
.ods
to GeoRSS
.xml
to MapInfo TAB
.tab
to File Geodatabase
.gdb.zip
to SpatiaLite
.sqlite
to GeoJSON Sequences
.geojsonl
to DGN (Microstation)
.dgn
Convert to GeoJSON From Other Formats
Convert other geospatial formats to GeoJSON
from KML
.kml
from Shapefile
.zip
from CSV
.csv
from GPX
.gpx
from GeoPackage
.gpkg
from FlatGeobuf
.fgb
from JSON-FG
.json
from MVT
.mvt
from PMTiles
.pmtiles
from MBTiles
.mbtiles
from DXF
.dxf
from TopoJSON
.topojson
from GML
.gml
from OpenStreetMap
.osm
from Excel (XLSX)
.xlsx
from OpenDocument Spreadsheet
.ods
from SVG
.svg
from GeoRSS
.xml
from MapInfo TAB
.tab
from File Geodatabase
.gdb.zip
from SpatiaLite
.sqlite
from Esri JSON
.json
from GeoJSON Sequences
.geojsonl
from DGN (Microstation)
.dgn
Visualize Your Data
View your geospatial files on an interactive map
Coordinate Conversion Tools
Convert between different coordinate systems