A spatial reference specifies the CoordinateSystem (projection) of geographic data. The spatial reference may be specified either as a string that contains the complete parameters of the coordinate system (projection parameters, datum, etc.), or as an integer ID from the standard coordinate system identifiers.

A spatial reference may also contain information about the datum, but currently the ESRI Web ADF does not store or use this information. However, the data sources used may contain and use datum information.

Geographic data usually contain a spatial reference to identify the projection of the map or data. For example, a Map control has a SpatialReference property to set or identify the spatial reference of the entire map.

For more information and codes for coordinate system IDs, see these references:

• ArcGIS Desktop Help: the topic "An overview of map projections", under Map projections and coordinate systems - Getting started with map projections. ArcGIS Desktop Help is also available online at ESRI Support.
• ArcIMS Help: the topic "Coordinate IDs and Descriptions" in the main ArcIMS Help (at ArcXML Guide - Coordinate IDs and Descriptions); ArcIMS Help is also available online at ESRI Support.
• ArcWeb Developer's Guide: Coordinate systems overview

System.Object
   ESRI.ArcGIS.ADF.Web.SpatialReference.SpatialReference

Target Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family, Windows Vista, Windows Server 2008 family

Reference