The CoordinateSystem object defines the projection coordinate system or datum transformation of a map layer, point, or envelope. To define the coordinate system or datum transformation, use either the id (projection ID) or string (projection name) but not both. For a complete list of supported IDs and definition strings, see the appropriate list:
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]
Note: In October 2005, ArcWeb Services updated its projections. New_Zealand_Transverse_Mercator now includes an ID (2193). The following projections are no longer supported: Belge_Lambert_1972 (103300), Greek_Athens_To_Greek (8179), Hungarian_1972_To_ETRF_1989_1 (8182), and New_Zealand_1949_To-NZGD_2000_NTv2 (108460).