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if you don't choose the pyramids resolution (up-right), then clicking the "build pyramid" button does nothing. Nevertheless if you choose at least one resolution then the button works, ans in the case of .img files a warning pops up
"Building pyramid overviews is not supported on this type of raster."
This is at least what happens with the .img raster you can find in the qgis sample dataset. Gdal tools also cannot create overviews for this particular file.
qgib
added
Bug
Either a bug report, or a bug fix. Let's hope for the latter!
Rasters
Related to general raster layer handling (not specific data formats)
labels
May 24, 2019
Author Name: Alexander Bruy (@alexbruy)
Original Redmine Issue: 2427
Redmine category:rasters
Assignee: ersts -
Seems that QGIS can't build pyramids for the ERDAS IMAGINE (IMG) files, even if file don't have buildin pyramids. To reproduce:
Open QGIS and load IMG file without internal and external pyramids
Right click on raster layer and select Properties-Pyramids.
Click on "Build pyramids" button. Nothing happens and no pyramids was builds
But with gdaladdo I can build pyramids on this files.
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