GdalDataSet.CreateOverviews Property
Gets or sets a flag indicating if the dataset should create downsampled versions of the original data, to speed up reading.
Syntax
public System.Boolean CreateOverviews { get; set; }Property Value
Default: false
True if overviews should be created, False otherwise.
This property can only be modified before the dataset has been initialized. Attempting to modify it after initialization will cause an exception to be thrown.
Remarks
The dataset can use GDAL overviews, which are downsampled versions of the original data, to speed up reading. Setting this property to True enables automatic creation of overviews for the dataset. The overviews are created at the same location as the original data file, one overview for each data file, with a ".ovr" extension.
If the VerifyIndexFiles property is True, the modification time of the data and overview files will be compared; if the overview file is out of date it will be regenerated. However, changes to the dataset properties that control how the overview files are created will not be detected. If these properties are changed, any old overview files will have to be deleted manually.
As of version 5.7, Carmenta Engine provides a more general raster cache/overview functionality that works both for GDAL and for several other datasets. In many cases you can get better performance using this raster cache instead of GDAL overviews. Refer to the RasterCachePolicy for more information.
Platforms
Windows, Linux, Android