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WGS84 to NAD83 Transformation

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#1
ohiosurfer

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Is there any way to determine which transformation was used when a feature class was projected from WGS84 to NAD83?

Is it stored in the metadata? Everything has been done in ArcGIS.

Thanks for your help.

#2
frax

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Did you check the metadata? The trail of processing should be stored in the metadata in ArcGIS, not sure to what extent though...
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#3
ohiosurfer

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You're right, the transformation used is stored as a "Process" under the "ESRI geoprocessing history".

I was able to see this in a sample dataset, but not in the actual data. Is it possible to delete a "Process" in the metadata?

#4
frax

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It will - of course - not be carried over if one doesn't copy the metadata with the actual data. I think there might also be some operations that don't register.
If you did this operation, have you checked the history toolbox?

Sometimes I miss the 'log' file that is in all ArcInfo workstation workspaces...
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#5
Robert2009

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I am not sure what you mean but I've played it around in the past by cleaning it up the ESRI geoprocessing history.

You can do it by right click on the personal or file geodatabase's context menu and go to Export XML Workspace Document.
Just uncheck on Export Metadata. That will not display the ESRI geoprocessing history and will create a new one.

Then on the same geodatabase, do the same thing by bring back it in the geodatabase or create a new geodatabase.
Use the Import XML Workspace Document.

If this is what you were looking for.

Good Luck,
Robert

#6
ohiosurfer

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Thank you both for your input. :) I believe this was an issue of the metadata not being copied.

Frax, I was unaware of the existence of the log file. Perhaps I can make use of it in the future.

Robert, I'll keep your tricks in mind if I ever have to clean-up metadata. Metadata is definitely a topic I would like to be more familiar with and this experience demonstrated why.

Thanks again!

#7
frax

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Note that that the log file applies to operations from ArcInfo workstation AND for grids - I just found out - I was able to retrieve the operation to create an ArcInfo grid, in the grid's folder (the grids reside in an ArcInfo workspace, even if they were created using the standard modern ArcGIS tools).

I wouldn't be suprised if there is some kind of log/history in geodatabases, by the way.
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