Web Mapping Illustrated

Name

IHO S-57 Files

Synopsis

• Also known as S57. The IHO S-57 format is a vector interchange format used for maritime charts.

• Developed by the International Hydrographic Organization (IHO). For more information about the IHO see http://www.iho.shom.fr/.

File listing

Individual S57 data files have an extension of *.000; for example, US1BS02M.000.

Data access/connection method

• S57 access in MapServer occurs through OGR; CONNECTIONTYPE OGR must be used.

• Specify a full path or a relative path from the SHAPEPATH to the .000 file for the CONNECTION.

• The CONNECTION must also include a layer number (as per the layer number from ogrinfo, but minus one).

Special notes

The underlying OGR code requires two files from your GDAL/OGR installation when reading S57 data in MapServer: s57objectclasses.csv and s57attributes.csv. These files can be found in the /GDAL/data/ folder. If you receive an error in MapServer such as:

    msDrawMap(): Image handling error. Failed to draw layer named 's57'. msOGRFileOpen():
    OGR error. GetLayer( 9) failed for OGR connection

you may have to point MapServer to these files using the CONFIG parameter in the main section of your map file:

    CONFIG GDAL_DATA "C:\gdal\data"

ogrinfo examples

Here's an example that uses ogrinfo on an S57 file to get the OGR index number:

    > ogrinfo us1bs02m.000 ERROR 4: S57 Driver doesn't support update. Had to open data source read-only. INFO: Open of 'us1bs02m.000' using driver 'IHO S-57 (ENC)' successful. 1: ADMARE (Polygon) 2: CBLSUB (Line String) 3: CTNARE ...