[postgis-tickets] [PostGIS] #2617: [raster] Enhanced mask object for raster map algebra

[PostGIS]

#2617: [raster] Enhanced mask object for raster map algebra
-------------------------+--------------------------------------------------
 Reporter:  dustymugs    |       Owner:  dustymugs     
     Type:  enhancement  |      Status:  new           
 Priority:  medium       |   Milestone:  PostGIS Future
Component:  raster       |     Version:  trunk         
 Keywords:               |  
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 With the introduction of the mask parameter for ST_MapAlgebra, we can now
 enhance the mask for additional flexibility.

 For a mask, be able to specify the POI pixel in the mask. This will permit
 truly user defined masks with even-valued dimensions and the POI does not
 need to be the center value of the mask.

 So in addition to:

 {{{
 0, 0, 0
 0, 1, 0
 0, 0, 0
 }}}

 We want to be able to do:

 {{{
 1, 0, 0
 0, 0, 0
 0, 0, 0
 }}}

 The "1" above just indicates the POI. Indicating the POI could be done
 with another (!!!) funciton parameter comprised of a 2-element array for
 the POI.

 {{{
 mask =[
 1, 1, 1, 1, 1
 1, 1, 1, 1, 1
 1, 1, 1, 1, 1
 ]

 poi = [3, 2] // X, Y
 }}}

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Ticket URL: <http://trac.osgeo.org/postgis/ticket/2617>
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