[postgis-tickets] [PostGIS] #2454: [raster] ST_PixelAsPolygons does not obey exclude_nodata_value=TRUE

[PostGIS]

#2454: [raster] ST_PixelAsPolygons does not obey exclude_nodata_value=TRUE
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 Reporter:  alfred  |       Owner:  dustymugs     
     Type:  defect  |      Status:  assigned      
 Priority:  medium  |   Milestone:  PostGIS Future
Component:  raster  |     Version:  trunk         
 Keywords:          |  
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Comment(by dustymugs):

 > The problem with that is that it increases the query time significantly
 by going over all the pixels (can be thousands of those), even that i care
 only about the ones that have data only.
 >

 It will always go over every pixel. How else are you to know what the
 value of a pixel is?

 > I was hoping that now that this function is implemented in C that this
 will provide boost in the speed, which it seems that it does in general,
 but not for this case.
 >

 It was always in C, even in 2.0.

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Ticket URL: <http://trac.osgeo.org/postgis/ticket/2454#comment:9>
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