Mosaic dataset overviews appear black/ have gaps in some parts

Discussion created by botmer on Jan 27, 2012
Latest reply on Mar 2, 2012 by GAlallasundaram-esristaff
I have created a large mosaic dataset with b/w aerial photos, checked both generate overviews and pyramyds options. These generate well for some areas but have large black gaps in many parts. The black patches disappear only when zooming in to very large scales, larger than 1:10,000. Images are .bil format with resolution of 1.5 to 2 pixels and custom coordinate system based GRS 1980 UTM 15. Is anything in the images properties that could be causing a problem? If I display them individually, they look fine. Because this is a very large dataset, I chose the mosaic dataset method. Raster catalog would also work, but I need to be able to plot some detailed areas with the photos and it won't work as it is now with black gaps.
I am using Arcgis 10 SP 3.
How can I correct this? I attach a screenshot.