[postgis-devel] [PostGIS] #1662: [raster] Make a ST_Extent(raster) aggregate taking rotation into account

[PostGIS]

#1662: [raster] Make a ST_Extent(raster) aggregate taking rotation into account
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 Reporter:  pracine      |       Owner:  pracine      
     Type:  enhancement  |      Status:  new          
 Priority:  medium       |   Milestone:  PostGIS 2.1.0
Component:  raster       |     Version:  trunk        
 Keywords:               |  
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 Right now we can use ST_Extent(rast::geometry) to get the non rotated
 extent of a set of rasters but we might want to get the rotated extend
 instead.

 This aggregate should be based on a _st_extent(raster, raster) doing
 basically the samething as ST_MapAlgebra(,,,'UNION') when it precompute
 the size of the resulting raster.

 This could then be used by the GDAL driver or any process needing to
 precalculate the size of a coverage before burning tiles in it.

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/1662>
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