[postgis-tickets] [PostGIS] #2805: [raster] Expected return from ST_MapAlgebra callback function is not documented

[PostGIS]

#2805: [raster] Expected return from ST_MapAlgebra callback function is not
documented
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 Reporter:  strk           |       Owner:  robe 
     Type:  defect         |      Status:  new  
 Priority:  medium         |   Milestone:       
Component:  documentation  |     Version:  trunk
 Keywords:                 |  
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 The documentation for ST_MapAlgebra does not say what is the semantic of
 the value returned by the user callback function.
 In particular, it doesn't mention you can return NULL to mean "nodata" (or
 can you ?)

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Ticket URL: <http://trac.osgeo.org/postgis/ticket/2805>
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