[postgis-devel] [PostGIS] #860: [raster] Modify ST_MapAlgebra to handle expressions and user-functions
PostGIS
trac at osgeo.org
Mon Oct 17 08:12:12 PDT 2011
#860: [raster] Modify ST_MapAlgebra to handle expressions and user-functions
----------------------------+-----------------------------------------------
Reporter: dzwarg | Owner: dzwarg
Type: enhancement | Status: new
Priority: blocker | Milestone: PostGIS 2.0.0
Component: postgis raster | Version: trunk
Keywords: history |
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Changes (by dzwarg):
* owner: pracine => dzwarg
Comment:
Replying to [comment:17 robe]:
> I think you have a typo in the last example:
>
> shouldn't:
>
> {{{
> ST_MapAlgebraFct(rast_view,1,NULL,'tan(rast)*rast')
> }}}
>
>
>
> Be:
>
> {{{
>
ST_MapAlgebraFct(rast_view,1,NULL,'rast_plus_tan(float,text[])'::regprocedure')
> }}}
>
> Also it is unclear from the description what the args argument is for an
if all userdefined functions require a second text[]. For example the
rast_plus_tan functions takes a text[] as second arg but never uses it.
>
Yup! That's a typo.
I will add a paragraph describing what a userfunction should look like,
what the arguments are, and things of that nature.
--
Ticket URL: <http://trac.osgeo.org/postgis/ticket/860#comment:18>
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