[postgis-users] Inconsistency between St_Value and ST_DumpAsPolygons

[Jean Marchal]

Dear List,

value's number 4 in this raster come out with ST_Value:

SELECT ST_Value(rast, 1, 8, 2), ST_BandnoDataValue(rast),
ST_BandPixelType(rast)
FROM (SELECT '
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raster
rast) foo

but not with ST_DumpAsPolygons:

SELECT (ST_DumpAsPolygons(rast)).val
FROM (SELECT
'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'::raster
rast) foo

Is this a bug or I am doing something wrong ?

Thanks,

Jean


-- 
Jean Marchal

Etudiant au doctorat / PHD student
Université Laval - Pavillon Abitibi-Price
Faculté de foresterie, de géographie et de géomatique
2405, rue de la Terrasse
Québec (Québec) G1V 0A6
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