[postgis-devel] [PostGIS] #1525: [raster] Redefine and expand the keywords available to MapAlgebra expressions

[PostGIS]

#1525: [raster] Redefine and expand the keywords available to MapAlgebra
expressions
-------------------------+--------------------------------------------------
 Reporter:  dustymugs    |       Owner:  pracine      
     Type:  enhancement  |      Status:  new          
 Priority:  critical     |   Milestone:  PostGIS 2.0.0
Component:  raster       |     Version:  2.0.x        
 Keywords:               |  
-------------------------+--------------------------------------------------

Comment(by strk):

 Note that #1119 is about enhancing expressivity further to take into
 account band number.
 Using [n] for addressing a band number wouldn't be that readable inside
 brackets.
 I wonder if we could find a general syntax capable of addressing multiple
 rasters (rather than only 1 or 2) and multiple bands in them.

 Like:

 {{{
 :rast[1].band[2].val
 :rast[2].band[1].x
 }}}

 Or, if we prefer square brackets:

 {{{
 [rast1.band2.val]
 [rast2.band1.x]
 }}}

 With defaults:

 {{{
 [rast.band2.y] -- defaults to rast1
 [rast3.band.val] -- defaults to band1
 [rast.x] -- defaults to rast1.band1.x
 [rast] -- defaults to rast1.band1.val
 }}}

-- 
Ticket URL: <http://trac.osgeo.org/postgis/ticket/1525#comment:20>
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