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A buffer I created successfully executed, but I received the following message: "WARNING 000632: Datum conflict between map and output." How can I fix this?

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This isn't really a big deal, just a minor warning from ArcGIS. If you want it to go away, change the spatial reference for your data frame to match that of your output feature class. More info: 000632 : Datum conflict between map and output.

Docs on how to change your data frame's spatial reference: Specifying a coordinate system

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From first link -- "layer is automatically transformed to the data frame's coordinate system." I interpret this to mean that my layer and data frame match up in the map display. Is this accurate? –  Beth Dec 8 '10 at 0:39
    
Also: will I run into problems running intersect and union functions if the coordinate systems are off? –  Beth Dec 8 '10 at 0:40
    
ArcGIS automatically reprojects data on the fly so that they can be displayed in the same coordinate system. The underlying data isn't actually transformed. –  Derek Swingley Dec 8 '10 at 1:00
    
Best practice would be to make sure all your inputs for intersect, union, etc. are in the same coordinate system but ArcGIS will transform them on the fly. –  Derek Swingley Dec 8 '10 at 1:01
    
great thanks! -b. –  Beth Dec 8 '10 at 1:09

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