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Mosaic overviews

Question asked by BTLeslie on Sep 15, 2015
Latest reply on Sep 15, 2015 by BTLeslie

I'm a bit confused about mosaic overviews.

I have approx 65000 tiles of 3-band colour imagery in my mosaic and I'm trying to create overviews so I can pickup on any obvious errors - corruptions, mis-coloured tiles etc.

 

Basically I'm not getting anything useful out of the tools - it just produces a checker board.

 

  • I used the default settings - no. rows = no. columns = 5120.  Result = nothing.
  • So I tried - no. rows = no. columns = 2560.  Result = little bits of apparently random checker board.
  • Ok lets try something more extreme - no. rows = no. columns = 320.  Result = if I zoom to the extents of the imagery I get full coverage of checkerboard, but if I zoom-in I just see little bits of checkerboard.

 

I'm not finding the help docs very enlightening, I'm struggling to understand how the tools work and how the results correspond to the settings, and I don't understand why I'm just seeing chessboard.

 

If I load the raw overview files into arc it's not much more useful - their total coverage is just a tiny portion of my total imagery coverage (although the content looks correct) -- is 65000 images too much for these tools to deal with?

 

Any advice on how to proceed?

 

Arc10.2 Windows 7 64 bit - top end speed and memory.

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