Pyramids are not build if tifw contains rotations

[qgib]

Author Name: Maxim Dubinin (@simgislab)
Original Redmine Issue: 1722
Affected QGIS version: master
Redmine category:rasters

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If tfw file contains rotations terms, pyramids are not build with the message: "Not supported on this type of raster".

Example attached, see lines 2 and 3, not equal to 0.
Replicated in 1.0.2 and 1.2-trunk

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• file2.rar (Maxim Dubinin)

[qgib]

Author Name: ersts - (ersts -)

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This is because the image is warped when it is loaded and considered a 'warped virtual dataset'. The image being drawn is not the original base image, though we do still have a pointer to that base image.

It seems like pyramids could be build for the based image, and then reloaded and rewarped again, but I need to check with the GDAL folks to see if pyramids are supported at all with virtual datasets.

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• status_id was changed from Open to In Progress

[qgib]

Author Name: Maxim Dubinin (@simgislab)

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I think the pyramids should be built for the base raster.

[qgib]

Author Name: Frank Warmerdam - (Frank Warmerdam -)

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Overviews can actually be built on vrt warped images however that doesn't work in the QGIS case where the warped VRT is actually just temporary - not saved to disk.

We could also build overviews on the underlying image however at this time the GDAL warp api underlying warped VRTs does not take advantage of overviews.

[qgib]

Author Name: ersts - (ersts -)

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Replying to [comment:5 warmerdam]:

We could also build overviews on the underlying image however at this time the GDAL warp api underlying warped VRTs does not take advantage of overviews.

Thanks Frank, that was the nugget I was looking for. So for now I guess we will just keep the ticket open and watch the following ticket

http://trac.osgeo.org/gdal/ticket/2076

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• fixed_version_id was changed from Version 1.7.0 to Version 1.7.4

[qgib]

Author Name: Paolo Cavallini (@pcav)

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• fixed_version_id was changed from Version 1.7.4 to Version 1.8.0
• version was configured as master
• crashes_corrupts_data was configured as 0

[qgib]

Author Name: Paolo Cavallini (@pcav)

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• fixed_version_id was changed from Version 1.8.0 to Version 2.0.0

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• status_id was changed from In Progress to Open
• pull_request_patch_supplied was configured as 0
• status_info was changed from 0 to
• operating_system was changed from All to
• assigned_to_id removed ersts

[qgib]

Author Name: Jürgen Fischer (@jef-n)

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• fixed_version_id was changed from Version 2.0.0 to Future Release - Lower Priority

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• regression was configured as 0
• easy_fix was configured as 0

[qgib]

Author Name: Giovanni Manghi (@gioman)

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End of life notice: QGIS 2.18 LTR
*
Source:*
http://blog.qgis.org/2019/03/09/end-of-life-notice-qgis-2-18-ltr/

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• resolution was changed from to end of life
• status_id was changed from Open to Closed