Can you file a ticket for this? Make sure to include your example. It looks like something is wrong in GDAL's GDALFPolygonize() function.
-bborie On 06/06/2013 01:50 PM, Jean Marchal wrote: > I am using GDAL 1.9.2, yep ST_PixelAsPolygons() works fine, > > Jean > > 2013/6/6 dustymugs <dustym...@gmail.com> > >> What version of GDAL are you using? ST_DumpAsPolygons() uses GDAL for >> processing. I notice that ST_PixelAsPolygons() works correctly... >> >> -bborie >> >> On 06/06/2013 01:04 PM, Jean Marchal wrote: >>> Bborie, >>> >>> I used ST_Value to prove that the value for pixel with coordinates (8,2) >>> does exist. I did not mention it but adjacent pixels contains different >>> values (see reproducible example). >>> >>> Jean >>> >>> 2013/6/6 Bborie Park <dustym...@gmail.com> >>> >>>> ST_Value and ST_DumpAsPolygons do very different things. ST_Value gets a >>>> value for a specific pixel while ST_DumpAsPolygons() dumps values by >>>> merging pixels with same value in an area. >>>> >>>> -bborie >>>> >>>> >>>> On Thu, Jun 6, 2013 at 12:38 PM, Jean Marchal <jean.d.marc...@gmail.com >>> wrote: >>>> >>>>> 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 >>>>> >>>>> _______________________________________________ >>>>> postgis-users mailing list >>>>> postgis-users@lists.osgeo.org >>>>> http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users >>>>> >>>>> >>>> >>>> _______________________________________________ >>>> postgis-users mailing list >>>> postgis-users@lists.osgeo.org >>>> http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users >>>> >>>> >>> >>> >>> >>> >>> _______________________________________________ >>> postgis-users mailing list >>> postgis-users@lists.osgeo.org >>> http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users >>> >> _______________________________________________ >> postgis-users mailing list >> postgis-users@lists.osgeo.org >> http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users >> > > > > > > _______________________________________________ > postgis-users mailing list > postgis-users@lists.osgeo.org > http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users > _______________________________________________ postgis-users mailing list postgis-users@lists.osgeo.org http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users