[postgis-tickets] [PostGIS] #2920: [raster] ST_Union(raster): ERROR: rt_raster_from_two_rasters: The two rasters provided do not have the same alignment

[PostGIS]

#2920: [raster] ST_Union(raster): ERROR:  rt_raster_from_two_rasters: The two
rasters provided do not have the same alignment
---------------------------+------------------------------------------------
 Reporter:  strk           |       Owner:  robe         
     Type:  defect         |      Status:  new          
 Priority:  high           |   Milestone:  PostGIS 2.1.4
Component:  documentation  |     Version:  2.1.x        
 Keywords:                 |  
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Changes (by strk):

  * owner:  dustymugs => robe
  * priority:  critical => high
  * component:  raster => documentation


Comment:

 Looking up the manual for "alignemnt" issues I found:
  - ST_MapAlgebraExpr2 will make the _output_ have the alignment of the
 first argument (meaning the input do not need to be aligned, right ?):
 http://postgis.net/docs/RT_ST_MapAlgebraExpr2.html
  - ST_SameAlignment short description does not mention offset as being
 part of the definition (in the detailed description there is more):
 http://postgis.net/docs/RT_ST_SameAlignment.html

 .. more things to look at

-- 
Ticket URL: <http://trac.osgeo.org/postgis/ticket/2920#comment:4>
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