[postgis-devel] [PostGIS] #1764: [raster] overviews not marked as same alignment though main table is

PostGIS trac at osgeo.org
Fri Apr 20 09:56:44 PDT 2012

#1764: [raster] overviews not marked as same alignment though main table is
 Reporter:  robe    |       Owner:  dustymugs    
     Type:  defect  |      Status:  assigned     
 Priority:  medium  |   Milestone:  PostGIS 2.1.0
Component:  raster  |     Version:  2.0.x        
 Keywords:          |  

Comment(by dustymugs):

 Currently, overviews are generated on a per raster basis.  This works
 great because each raster is treated independently.

 But the limitation of this method is that though the rasters may be
 aligned, the overviews for a particular factor may not be aligned.  A
 possible solution is for rasters to be processed first and create
 overviews afterwards.  This would allow the loader to check that the
 rasters are aligned and then determine a new alignment grid for the
 overview at a specific factor.  Only by doing this can we guarantee that
 the overview at a specific factor is aligned.

 I still don't know if this is worth doing though as this can ONLY be run
 if all source rasters are aligned.

Ticket URL: <https://trac.osgeo.org/postgis/ticket/1764#comment:15>
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