[postgis-users] to get raster values bigger than 20
Ahmet Temiz
ahmettemiz88 at gmail.com
Mon Jun 10 11:46:02 PDT 2013
hello
Using postgis-raster,I want to get raster values bigger than 20.
I tried :
SELECT ST_AsBinary((ST_DumpAsPolygons(rast)).geom),
(ST_DumpAsPolygons(rast)).val
FROM (select ST_MapAlgebraExpr(rast,1,'CASE WHEN [rast] > 20 THEN 1
ELSE 0 END','0') from slp5 ) as rast;
It is wrong
I will appreciate if you give me a hint
regards
--
Ahmet Temiz
Jeoloji Müh.
Afet ve Acil Durum Yönetimi Başkanlığı
Planlama ve Zarar Azaltma Dairesi Başkanlığı
________________________
Ahmet Temiz
Geological Eng.
Information Systems - GIS Group
Disaster and Emergency Management
of Presidency
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