I'd anticipate that both commands would yield the same outcome: $ gdalwarp -oo OVERVIEW_LEVEL=1 -dstalpha input.vrt ovr1.tif $ gdalwarp -ovr 1 -dstalpha input.vrt ovr1.tif
However, the reality is different. The first command behaves as intended, utilizing overviews from *.vrt.ovr, while the second command operates noticeably slower, seemingly disregarding the overviews.
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