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Test option to ignore overviews (OVERVIEW_LEVEL=-1) (#2050)
* Test for upcoming GDAL feature (from 3.3) allowing existing overviews to not be exposed - see OSGeo/gdal#3181 - see https://rasterio.groups.io/g/main/message/649 The test: - requires gdal 3.3 - tests whether a dataset can be opened with OVERVIEW_LEVEL=-1 - ensures that opening a dataset with OVERVIEW_LEVEL=-1 ignores the file overview - ensures that a decimated read on a dataset opened with OVERVIEW_LEVEL=1 does not read the file overview * Make test for ignoring overviews when performing decimated read more simple and robust
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