[postgis-users] ST_MapAlgebraExpr() Function

[Deepak R aj Awasthi]

Thanks for suggestion, I have checked the date and it is "2011-10-06 08:02:01".  What could be other problem can you please.. 


________________________________
 From: Paragon Corporation <lr at pcorp.us>
To: 'PostGIS Users Discussion' <postgis-users at postgis.refractions.net> 
Sent: Monday, 23 January 2012, 4:57
Subject: Re: [postgis-users] ST_MapAlgebraExpr() Function
 

Hmm I meant 2012-01-01


>________________________________
> From: postgis-users-bounces at postgis.refractions.net  [mailto:postgis-users-bounces at postgis.refractions.net] On Behalf Of Paragon Corporation
>Sent: Sunday, January 22, 2012 10:48  PM
>To: 'PostGIS Users Discussion'
>Subject: Re:  [postgis-users] ST_MapAlgebraExpr() Function
>
>
>Just tried it on my latest build which is about a  week old (a little newer than the windows build currently on site but much  older than when this doc section was written).  Works fine for  me.
> 
>Which version of PostGIS are you  using?
> 
>Run this command:
> select postgis_scripts_build_date(),  postgis_raster_lib_build_date();
> 
>Make sure both return a value later than  2011-01-01
> 
>Hope that helps,
>Regina
>
>
>>________________________________
>> From: postgis-users-bounces at postgis.refractions.net  [mailto:postgis-users-bounces at postgis.refractions.net] On Behalf Of Deepak R aj Awasthi
>>Sent: Sunday, January 22, 2012 12:13  PM
>>To: postgis-users at postgis.refractions.net
>>Subject: [postgis-users] ST_MapAlgebraExpr() Function
>>
>>
>>Hello,
>>
>>
>>I am a 
    M.Sc. student and currently working with postgreSQL/PostGIS to 
    handle  raster.  I have installed PostgreSQl  9.0 and 
    PostGIS 2.0 in  windows 7  home premium OS. I had no 
    problem on handling raster so far but now I got problem while accessing 
    ST_MapAlgebraExpr () function  which takes two rasters as function 
    arguments. I have followed the example provided in the link below as 
    follows.
>>
>>
>>First, I  create the table as given,
>>
>>
>>CREATE TABLE fun_shapes(rid serial PRIMARY KEY, fun_name text, rast raster);Then,  the second syntax to insert raster and finally the use of the function  ST_MapAlgebraExpr()  as.
>>SELECT  ST_MapAlgebraExpr( area.rast, bub.rast, 'rast2', '8BUI', 'INTERSECTION', 'rast2', 'rast1') As interrast, ST_MapAlgebraExpr( area.rast, bub.rast, 'rast2', '8BUI', 'UNION', 'rast2', 'rast1') As unionrast
FROM  (SELECT rast FROM fun_shapes WHERE fun_name = 'area') As area
CROSS JOIN  (SELECT rast 
FROM fun_shapes WHERE fun_name = 'rand bubbles') As bub
>>
>> 
>> http://postgis.refractions.net/documentation/manual-svn/RT_ST_MapAlgebraExpr2.html
>>
>>
>>But I got  error on using this syntax as:
>>
>>ERROR:  function 
    st_mapalgebraexpr(raster, raster, unknown, unknown,  unknown, 
    unknown, unknown) does not exist
>> LINE 58: SELECT 
     ST_MapAlgebraExpr()
>>  HINT:  No function matches the 
    given name and argument types. You might need to add explicit type 
    casts.
>>
>>
>> Although I am new to this database, I think  that there is problem with  PostGIS 2.0 to support the function. If this  the case which version I have  to install to use this function. Can anyone  provide me solution for it.
>>
>> Thanks
>>
>> With Best 
    Regards,
>> Deepak
>>
>>
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