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Speed up building overviews on a mosaic dataset

Question asked by bshelton777 on May 25, 2017
Latest reply on May 26, 2017 by bshelton777

I am running some tests on building overviews to see if the process can be sped up, but get confusing results.  Using the define overviews tool in ArcGIS 10.5, I defined and built overviews for about 1,000 tiles of 6" orthoimagery.  I used the default parameters and it created over 300 overviews and took 4 hours to build.  I reduced the number of levels to 3 and increased the Overview Sampling Factor to 10.  I also increased the number of rows and columns.  This resulted in only 25 overviews, but still took 4 hours to build.  How does it take the same amount of time to create 25 overviews as it does 300?  I have tried different combinations of parameters, and it always results in a 4 hour process.  Is there any other methods for speeding up the process of building overviews?  The only thing I have found that provided any efficiency is creating them on the local hard drive as opposed to an external hard drive.