Hi,
The image mosaic must fulfill all this:
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All the granules must share the same Coordinate Reference System, no reprojection is performed. This will always be a constraint.
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All the granules must share the same ColorModel and SampleModel. This is a limitation/assumption of the underlying JAI Mosaic operator: it basically means that the granules must share the same pixel layout and photometric interpretation. It would be quite difficult to overcome this limitation, but to some extent it could be done. Notice that, in case of colormapped granules, if the various granules share the same colormap the code will do its best to retain it and try not to expand them in memory. This can also be controlled via a parameter in the configuration file (se next sections)
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All the granules must share the same spatial resolution and set of overviews (if this is not true, overviews will not be used).
Image mosaic troubles are not uncommon and they tend to be hard to help with. We should have a tool that walks through all the granules in the mosaic and builds a report.
-Jukka Rahkonen-