Warped VRT: instantiate overview bands in a lazy fashion for faster execution #10833
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…xecution This benefits use cases with a 'large' number of overview levels, and where creation of the GDALWarpOperation for each one is slow (might involve PROJ operations) On a warped VRT using a source GeoTIFF with 7 overview levels, ``gdal_translate warped_vrt_.vrt out.tif -outsize 1024 0`` goes from 1.6 sec to 0.9 s.
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This benefits use cases with a 'large' number of overview levels, and where creation of the GDALWarpOperation for each one is slow (might involve PROJ operations)
On a warped VRT using a source GeoTIFF with 7 overview levels,
gdal_translate warped_vrt.vrt out.tif -outsize 1024 0goes from 1.6 sec to 0.9 s.