Generating raster overviews (pyramids)
A raster pyramid is a reduced-resolution version of a raster. The purpose of a pyramid is to reduce the time it takes to display a raster. Pyramids can be built at multiple levels to help strike a balance between the pyramid's file size and the display speed.
To build a raster overview in QGIS, click on Build overviews (Pyramids) by navigating to Raster | Miscellaneous. This will open the Build overviews (Pyramids) tool window, as shown in the following screenshot:
The Build overviews tool provides a few options, as well as the ability to edit the GDAL command that will build the overviews. By selecting Batch ...
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