Description:

Defines the projection coordinate system of a layer. COORDSYS cannot be used to project a layer; its purpose is to provide the metadata for the layer. FEATURECOORDSYS and FILTERCOORDSYS are used to project the layers to a specified projection.

Restrictions:

• Must use either id or string, but not both.
• For datum transformations either datumtransformid or datumtransformstring is used, but not both.
• In ArcMap Image Services, datumtransformid or datumtransformstring are not valid.

Notes:

• For a complete list of supported IDs and definition strings, see:
  • Projected Coordinate Systems Listing [Sorted by projection ID] [Sorted by name]
  • Geographic Coordinate Systems Listing [Sorted by projection ID] [Sorted by name]
  • Datum Transformation Listing [Sorted by projection ID] [Sorted by name]
   
• When using definition strings, the quotes in the string must be changed to " so the ArcIMS Spatial Server can interpret the string correctly. For example, the definition string for World Mollweide is:
  
  PROJCS["World_Mollweide",GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137,298.257223563]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]],PROJECTION["Mollweide"],PARAMETER["False_Easting",0],PARAMETER["False_Northing",0],PARAMETER["Central_Meridian",0],UNIT["Meter",1]]
  
  Once the quotes have been changed, the string looks like this:
  
  PROJCS["World_Mollweide",GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137,298.257223563]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]],PROJECTION["Mollweide"],PARAMETER["False_Easting",0],PARAMETER["False_Northing",0],PARAMETER["Central_Meridian",0],UNIT["Meter",1]]
• The attributes datumtransformid and datumtransformstring are used when datum transformation information needs to be included. Only datum transformations to and from WGS 1984 are supported.
  • When these attributes are used with COORDSYS and FILTERCOORDSYS, the datum transformation is from a non-WGS 1984 datum to WGS 1984. For example, Pulkovo_1942_To_WGS_1984 (datumtransformid="8157") transforms data from Pulkovo 1942 to WGS 1984.
  • When these attributes are used with FEATURECOORDSYS, the datum transformation is from WGS 1984 to a non-WGS 1984 datum. In the above example, the datum transformation is from WGS 1984 to Pulkovo 1942.
• When using COORDSYS in an acetate layer, the COORDSYS element should be placed inside the OBJECT element rather than the LAYER element.
• COORDSYS can be used to designate the current projection of an image. Image layers can be projected along with feature and acetate layers.
• COORDSYS is always required in order to project image or acetate layers.
• COORDSYS is not needed if no datum transformation information is needed for the layer and:
  • A *.prj file is available for a shapefile.
  • A *.prj file is available for a coverage in ArcSDE for Coverages.
  • A spatial references table is used in ArcSDE.
  Datum transformation information is not included in *.prj files and spatial reference tables. Therefore, COORDSYS must be included if a datum transformation is needed.
• If a layer does not project, double check that a *.prj file or spatial reference table exists for the layer. If not, COORDSYS must be included.
• For more information on the projection elements, see Using Projection Elements.

Attribute Descriptions for COORDSYS:

Examples for COORDSYS: