Bug report #1722

Pyramids are not build if tifw contains rotations

Added by Maxim Dubinin over 10 years ago. Updated 9 months ago.

Status:Closed
Priority:Low
Assignee:-
Category:Rasters
Affected QGIS version:master Regression?:No
Operating System: Easy fix?:No
Pull Request or Patch supplied:No Resolution:end of life
Crashes QGIS or corrupts data:No Copied to github as #:11782

Description

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

file2.rar (126 KB) Maxim Dubinin, 2009-06-06 01:18 PM

History

#1 Updated by ersts - over 10 years ago

  • Status changed from Open to In Progress

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.

#2 Updated by Maxim Dubinin over 10 years ago

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

#3 Updated by Frank Warmerdam - over 10 years ago

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.

#4 Updated by ersts - over 10 years ago

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

#5 Updated by Giovanni Manghi almost 8 years ago

  • Target version changed from Version 1.7.0 to Version 1.7.4

#6 Updated by Paolo Cavallini over 7 years ago

  • Target version changed from Version 1.7.4 to Version 1.8.0
  • Affected QGIS version set to master
  • Crashes QGIS or corrupts data set to No

#7 Updated by Paolo Cavallini about 7 years ago

  • Target version changed from Version 1.8.0 to Version 2.0.0

#8 Updated by Giovanni Manghi about 7 years ago

  • Status changed from In Progress to Open
  • Pull Request or Patch supplied set to No
  • Status info deleted (0)
  • Operating System deleted (All)
  • Assignee deleted (ersts -)

#9 Updated by Jürgen Fischer over 5 years ago

  • Target version changed from Version 2.0.0 to Future Release - Lower Priority

#10 Updated by Giovanni Manghi over 2 years ago

  • Regression? set to No
  • Easy fix? set to No

#11 Updated by Giovanni Manghi 9 months ago

  • Resolution set to end of life
  • Status changed from Open to Closed

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