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Datum transformation

Question asked by EninnaLuli on May 24, 2016
Latest reply on May 27, 2016 by MKennedy-esristaff

I am doing exercise "Troubleshoot Datum shift" in certificate "Working with Coordinate Systems in ArcGIS"


I converted the datum to have the point hydrants in the parcels (as per instructions):


Then the problem occurs because some of the hydrants are just a bit outside of the parcels, and not inside.

As per instructions, I change from NAD27 to NAD83 under "Coordinate Systems" and I get the following message:


After I click Yes, all the hydrants are inside the parcels.


However, I experimented for my own interest: I didn't do the data transformation but skipped to the step of changing from NAD27 to NAD83. The results is the same. Thus, what is the purpose of going through the data transformation?


map projections