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HowTo: Select the correct geographic (datum) transformation when projecting between datums
| Article ID: | 21327 |
|---|---|
| Software: | ArcGIS - ArcEditor 8.1, 8.1.2, 8.2, 8.3, 9.0, 9.1, 9.2, 9.3 ArcGIS - ArcInfo 8.1, 8.1.2, 8.2, 8.3, 9.0, 9.1, 9.2, 9.3 ArcGIS - ArcView 8.1, 8.1.2, 8.2, 8.3, 9.0, 9.1, 9.2, 9.3 |
| Platforms: | N/A |
Summary
It is necessary to specify a geographic (datum) transformation when using the ArcToolBox Project Wizard (ArcGIS version 8.x) or Project Tool (ArcGIS version 9.x) to project shapefiles or geodatabase feature classes between different geographic coordinate systems (datums).
Procedure
Click a link in Related Information to access a list of the geographic (datum) transformation methods available in ArcGIS and the geographic areas for which these transformations are appropriate, for your version of ArcGIS Desktop.
Datum transformations work in either direction. For example, the transformation listed as NAD_1927_to_NAD_1983_NADCON transforms from NAD 1983 to NAD 1927, as well as from NAD 1927 to NAD 1983.
Datum transformations work in either direction. For example, the transformation listed as NAD_1927_to_NAD_1983_NADCON transforms from NAD 1983 to NAD 1927, as well as from NAD 1927 to NAD 1983.Related Information
- ArcGIS Projection Engine version 8.3 Datum transformation methods and appropriate geographic areas
- Projection Engine: Supported Coordinate Systems and Geographic Transformations (prior to version 8.3)
- ArcGIS Projection Engine version 9.x Datum transformation methods and appropriate geographic areas
- ArcGIS Projection Engine version 9.2 Datum transformation methods and appropriate geographic areas
- ArcGIS Projection Engine 9.3 Datum transformation methods and appropriate geographic areas
Created: 1/2/2002
Last Modified: 8/14/2008