[postgis-devel] [PostGIS] #590: [raster] Two rasters version of ST_MapAlgebra

PostGIS trac at osgeo.org
Thu Oct 20 16:41:39 PDT 2011

#590: [raster] Two rasters version of ST_MapAlgebra
 Reporter:  pracine         |       Owner:  dustymugs    
     Type:  task            |      Status:  assigned     
 Priority:  critical        |   Milestone:  PostGIS 2.0.0
Component:  postgis raster  |     Version:  trunk        
 Keywords:                  |  

Comment(by dustymugs):

 I don't believe we want an additional parameter specifying which raster is
 the primary raster as per:

 An optional option could be added to allow specifying which raster,
 between the first and the second, is the MASTER raster. The MASTER raster
 is used to determine the pixeltype, the alignment and the nodatavalue of
 the resulting raster. If the MASTER raster do not have a nodata value
 defined and it is necessary to set one in the resulting raster then the
 minimal possible value for the pixeltype should be used as nodata value.
 In case this option would not be added or in case it is not passed to the
 function, the first raster should be used to determine those informations.

 Instead, whichever raster is provided first to ST_MapAlgebra should be the
 MASTER/primary raster.

Ticket URL: <http://trac.osgeo.org/postgis/ticket/590#comment:11>
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