[Qgis-user] PostGIS raster access in QGIS using DBManager (or wktraster)

[José Pedro Santos]

Ciao Guido,

DBManager is only for vector layers..In the version 1.8 existed a plugin for importing raster layers but wasn't update for this new version. 

Regards,
José Santos 

From: guido.lemoine at jrc.ec.europa.eu
To: qgis-user at lists.osgeo.org
Date: Fri, 7 Mar 2014 07:51:33 +0100
Subject: [Qgis-user] PostGIS raster access in QGIS using DBManager (or	wktraster)

Dear QGIS users,

[This was posted on QGIS developer as well, but maybe I should seek the solution here]
I am using QGIS 2.2 .0 (Valmiera) and trying to load a raster query result via DBManager, using the following query:

select 1 as rid, st_union(st_band(rast, '4,3,2') ) as rast
from o_8_lc81970232013202lgn00_all_rds_sub, municipalities
where municipalities.wkb_geometry && rast
and munname = 'Veendam' 

(in short: Band 4,3,2 of a raster2pgsql-loaded Landsat-8 image (overview 8 version) for a "municipality" polygon (administrative commune boundary).

Execute (F5) correctly returns a single row (and I can save the union result with ST_AsTIFF() to file in a script)

When I try to "Load as a new layer" to visualise the result in QGIS, I get the following error message:

Erroneous query: SELECT DISTINCT upper(geometrytype("rast")),st_srid("rast") FROM (select 1 as rid, st_union(st_band(rast, '4,3,2') ) as rast
from o_8_lc81970232013202lgn00_all_rds_sub, gemeentegebieden
where gemeentegebieden.wkb_geometry && rast
and gemnaam = 'Veendam' 
) AS "subQuery_0" returned 7 [ERROR:  function geometrytype(raster) does not exist
LINE 1: SELECT DISTINCT upper(geometrytype("rast")),st_srid("rast") ...
                              ^
HINT:  No function matches the given name and argument types. You might need to add explicit type casts.
]

Apparently, my query get "wrapped"  in the SELECT DISTINCT outer query above (which obviously does not work).

Is this a known issue, and, if so, can it be modified, for instance by providing explicitly geometrytype and srid (and if so, how?).

I also checked out the wktraster plugin, but that does not work for 2.2. Is an upgrade expected soon [or should I try writing it myself].

Thanks for all the wonderful stuff,

Guido Lemoine  
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