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If hillshade < 0, hillshade = 0 for ST_HillShade()

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git-svn-id: http://svn.osgeo.org/postgis/trunk@10689 b70326c6-7e19-0410-871a-916f4a2858ee
This commit is contained in:
Bborie Park 2012-11-16 01:32:02 +00:00
parent 14dfdbfd6b
commit 81d92baf7d
1 changed files with 5 additions and 0 deletions
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5
raster/rt_pg/rtpostgis.sql.in.c
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@ -3795,6 +3795,11 @@ CREATE OR REPLACE FUNCTION _st_hillshade4ma(value double precision[][][], pos in
END IF;
shade := _bright * ((cos(zenith) * cos(slope)) + (sin(zenith) * sin(slope) * cos(azimuth - aspect)));
IF shade < 0. THEN
shade := 0;
END IF;
RETURN shade;
END;
$$ LANGUAGE 'plpgsql' IMMUTABLE;