For the Data Frame Properties on a map in ArcMap, what is the difference between selecting a new coordinate system and using a Transformation?
Answer
A transformation should be used to "transform" between two systems such as geographic coordinate system (GCS) and Projected Coordinate System (PCS). There are other instances for it's use also. Link #3 is the ESRI 9.3 help page that is pretty good about describing the difference.
Just right
To choose the correct transformation see the esri help
and for the right application.
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