[postgis-tickets] [PostGIS] #2807: [raster] ST_MapAlgebra injecting a default NODATA value of 0

[PostGIS]

#2807: [raster] ST_MapAlgebra injecting a default NODATA value of 0
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 Reporter:  strk    |       Owner:  dustymugs    
     Type:  defect  |      Status:  new          
 Priority:  medium  |   Milestone:  PostGIS 2.2.0
Component:  raster  |     Version:  trunk        
 Keywords:          |  
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Comment(by pracine):

 Replying to [comment:2 pracine]:
 > Humm... I guess ST_MapAlgebra() HAS to produce a raster with a NODATA
 value because you can never know if the result of the expression could end
 up being NULL... Make sence?

 There could be a switch though saying "No NODATA value" if you are sure
 your expression will never return a NULL, but then if does return NULL you
 get an unexpected value. If you don't like the fact that the resulting
 raster has a nodata value just ST_SetBandNoDataValue(rast, NULL) it!

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Ticket URL: <http://trac.osgeo.org/postgis/ticket/2807#comment:3>
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