[postgis-users] problem with 'sobel' & ST_MapAlgebraFctNgb

[laurent]

Hello,

I would like apply a sobel filter to my raster DEM. In a 1st time, i defined
the sobel function in a sql.file. 
In a 2nd time, i tried to run the 'ST_MapAlgebraFctNgb'  via PSQL console
available via pgadmin3.

When i run the query, i have an error message saying : The "Sobel(float []
[], text []" does not exist. 


I send you by attachment the 'sobel.sql' & the 'ST_MapAlgebraFctNgb' query. 

Could you throw light for me please? 

Regards. 

IMAGE. 

sobel.sql <http://postgis.17.n6.nabble.com/file/n5002352/sobel.sql>  
Query_ST_MapAlgebraFctNgb.sql
<http://postgis.17.n6.nabble.com/file/n5002352/Query_ST_MapAlgebraFctNgb.sql>  



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