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The AbstractGridCoverage2DReader.getReadingResolutions method has this piece of code:
...
int imageIdx = pickOverviewLevel(coverageName, policy, requestedResolution);
result = overViewResolutions[imageIdx];
...
However, note that imageIdx are zero based where "0" means the native resolution and "1" means the first overview.
Therefore the first overview (having index = 1) resolution should be taken from the element 0 of the overviewResolutions array.
And that piece of code should be changed like this:
....
int imageIdx = pickOverviewLevel(coverageName, policy, requestedResolution);
result = imageIdx > 0 ? overViewResolutions[imageIdx - 1] : highestRes;
....
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