[postgis-tickets] [PostGIS] #2247: [raster] Create ST_CreateOverviews()

[PostGIS]

#2247: [raster] Create ST_CreateOverviews()
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 Reporter:  dzwarg             |       Owner:  dzwarg       
     Type:  enhancement        |      Status:  new          
 Priority:  medium             |   Milestone:  PostGIS 2.2.0
Component:  raster             |     Version:  trunk        
 Keywords:  raster, overviews  |  
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Comment(by strk):

 Consider this scenario:

  1) you import a raster tiled
  2) you reproject each tile to a new SRS

 As a result your tiles might end up having different scales.

 Now you want to create a new regular tiled coverage.
 The output scales you want to be all the same, but the input scales are
 not.
 With the currently suggested signature of the ST_CreateOverviews function
 you cannot do that as you cannot specify the output scale, if not as a
 factor of the input scale, which in this case is not a fixed value.

 It is true that given the current definition of an overview
 (raster_overviews view structure) you can not even express an "overview"
 for a table which does not have a fixed scale, so the operation described
 above might be something different from an "overview" creation.

-- 
Ticket URL: <http://trac.osgeo.org/postgis/ticket/2247#comment:17>
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