[mapserver-users] MapServer/GDAL Debug for Overview Selection

[geojohn]

I have a map which has both a color elevation and a relief. They both have 8
power of 2 overviews.

At some point MapServer/GDAL switches from using an overview to using the
full resolution version.

This doesn't appear to happen at the right time. That is, everything looks
fine, and at some point it switches to full resolution and the relief is no
longer prominent enough.

I turned on every debug option I could find, but GDAL doesn't seem to output
which overview it's actually using. The debug messages show that the
overviews are opened, but there's no message showing which was selected.

Is there any way to debug this?



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