.. _s57:

*****************************************************************************
 S57
*****************************************************************************

Also known as S57.  The IHO S-57 format is a vector interchange 
format used for maritime charts. It was developed by the International Hydrographic Organisation (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
*  Use the DATA parameter to specify the s57 layer name

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 (unix: /usr/local/share/gdal windows: /ms4w/gdaldata).  If you receive an error in MapServer such as:

::

	msDrawMap(): Image handling error. Failed to draw layer named 's57'.
	msOGRFileOpen(): OGR error. xxx 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:\ms4w\gdaldata"

OGRINFO Examples
-------------------
Using ogrinfo on an S57 file to get the layer name:

::

	> 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
	4: COALNE (Line String)
	5: DEPARE
	6: DEPCNT (Line String)
	7: LNDARE
	8: LNDELV
	9: LNDRGN
	10: LNDMRK
	11: LIGHTS (Point)
	12: OBSTRN
	13: RDOSTA (Point)
	14: SEAARE
	15: SBDARE
	16: SLCONS
	17: SOUNDG (Multi Point)
	18: UWTROC (Point)
	19: WATTUR
	20: WRECKS
	21: M_COVR (Polygon)
	22: M_NPUB (Polygon)
	23: M_NSYS (Polygon)
	24: M_QUAL (Polygon)
	25: C_ASSO (None)

Using ogrinfo to examine the structure of an S57 layer:

::

	> ogrinfo us1bs02m.000 DEPARE -summary
	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.

	Layer name: DEPARE
	Geometry: Unknown (any)
	Feature Count: 297
	Extent: (165.666667, 48.500000) - (180.000000, 60.750000)
	Layer SRS WKT:
	GEOGCS["WGS 84",
    DATUM["WGS_1984",
        SPHEROID["WGS 84",6378137,298.257223563]],
    PRIMEM["Greenwich",0],
    UNIT["degree",0.0174532925199433]]
	GRUP: Integer (3.0)
	OBJL: Integer (5.0)
	RVER: Integer (3.0)
	AGEN: Integer (2.0)
	FIDN: Integer (10.0)
	FIDS: Integer (5.0)
	LNAM: String (16.0)
	LNAM_REFS: StringList (16.0)
	DRVAL1: Real (0.0)
	DRVAL2: Real (0.0)
	QUASOU: String (0.0)
	SOUACC: Real (0.0)
	VERDAT: Integer (0.0)
	INFORM: String (0.0)
	NINFOM: String (0.0)
	NTXTDS: String (0.0)
	SCAMAX: Integer (0.0)
	SCAMIN: Integer (0.0)
	TXTDSC: String (0.0)
	RECDAT: String (0.0)
	RECIND: String (0.0)
	...

Map File Example:

::

	LAYER
	  NAME s57
	  TYPE POLYGON
	  STATUS DEFAULT
	  CONNECTIONTYPE OGR
	  CONNECTION "./s57/us1bs02m.000"
          DATA "DEPARE" 
	  CLASS
           STYLE
	     COLOR 247 237 219
	     OUTLINECOLOR 120 120 120
           END
	  END
	END # Layer