Opened 15 years ago
Closed 15 years ago
#3124 closed defect (fixed)
GDALDataset::BlockBasedRasterIO() does not use overviews
| Reported by: | warmerdam | Owned by: | warmerdam |
|---|---|---|---|
| Priority: | normal | Milestone: | 1.6.3 |
| Component: | GDAL_Raster | Version: | 1.6.2 |
| Severity: | normal | Keywords: | overviews georaster |
| Cc: | ilucena |
Description
It appears that GDALDataset::BlockBasedRasterIO() does not attempt to use overviews if appropriate. This interferes in achieving appropriate performance in some cases.
The problem can be reproduced by running autotest/gcore/tiff_ovr.py (trunk) with GDAL_FORCE_CACHING set to YES. Test tiff_ovr_35 will fail. It also is interfering with the performance of the GeoRaster driver in (for instance) MapServer.
Change History (3)
comment:1 by , 15 years ago
comment:2 by , 15 years ago
r17625 /trunk/autotest/gcore/tiff_ovr.py: Test that overviews are used by BlockBasedRasterIO()
comment:3 by , 15 years ago
| Keywords: | georaster added |
|---|---|
| Resolution: | → fixed |
| Status: | new → closed |
No problems have been encountered with this change in trunk, so I've backported it to 1.6 branch (r17804).
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In trunk only, r17621 /trunk/gdal/gcore/rasterio.cpp: Add support for using overviews in GDALDataset::BlockBasedRasterIO()