public enum CoordinateSystemType

Public Enumeration CoordinateSystemType

This enumeration can be used to identify which type of coordinate system model is used by a specific instance of the CoordinateSystem class, by checking the Type property. There are two types of coordinate system used within ArcGIS Explorer to reference locations to a position on earth, projected and geographic.

You may see this number referred to in some ArcGIS documentation as a factory code, projection engine code, or a Well Known Identifier (WKID). For example, ArcGIS Server web service APIs define WKID parameters which allow you to specify a particular unit; developing for ArcGIS using ArcObjects, these numbers are defined in enumeration sets that begin with 'esriSR', for example the enumerations esriSRUnitType and esriSRUnit2Type define identifiers for types of unit of measurement.

These identifier numbers are based on an industry standard defined by the European Petroleum Survey Group (EPSG), and very occasionally, the code value for which an enumeration stands may change; for this reason it is recommended that you use the enumeration member rather than the numeric value in code. Any changes will be noted in the change reports for this API. You can find out more information about the units and coordinate systems defined by the EPSG at their website, http://www.epsg.org.

See the Coordinate System Concepts topic for more information about coordinate system types.

The code below reports on the coordinate system used by the 2D display. Projected coordinate systems are based upon an underlying geographic system - this is also reported if the system used in 2D is a projected one, by using the Type and BaseGeographicCoordinateSystem properties. The code assumes you have imported the Geometry namespace.

CopyC#

ESRI.ArcGISExplorer.Mapping.MapDisplay disp = ESRI.ArcGISExplorer.Application.Application.ActiveMapDisplay;
CoordinateSystem cs = disp.CoordinateSystem2D;

StringBuilder sb = new StringBuilder("The 2D Coordinate System is:" + cs.Type);
sb.AppendLine("Name: " + cs.Name);
// Projected coordinate systems are based on a separate geographic coordinate system.
if (disp.CoordinateSystem2D.Type == CoordinateSystemType.Projected)
{
  sb.AppendLine("Based on the geographic system:" + cs.BaseGeographicCoordinateSystem.Name);
}
MessageBox.Show(sb.ToString(), "2D Coordinate System Information");

CopyVB.NET

Dim disp As ESRI.ArcGISExplorer.Mapping.MapDisplay = ESRI.ArcGISExplorer.Application.Application.ActiveMapDisplay
Dim cs As CoordinateSystem = disp.CoordinateSystem2D

Dim sb As StringBuilder = New StringBuilder("The 2D Coordinate System is:" & cs.Type)
sb.AppendLine("Name: " & cs.Name)
' Projected coordinate systems are based on a separate geographic coordinate system.
If disp.CoordinateSystem2D.Type = CoordinateSystemType.Projected Then
  sb.AppendLine("Based on the geographic system:" & cs.BaseGeographicCoordinateSystem.Name)
End If

MessageBox.Show(sb.ToString(), "2D Coordinate System Information")