[postgis-devel] [PostGIS] #1525: [raster] Redefine and expand the keywords available to MapAlgebra expressions
PostGIS
trac at osgeo.org
Fri Feb 3 06:43:19 PST 2012
#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: |
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Comment(by dustymugs):
Replying to [comment:20 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
> }}}
You may want to put this in the other ticket (#1119) as this feels like it
is better suited there.
--
Ticket URL: <http://trac.osgeo.org/postgis/ticket/1525#comment:21>
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