[postgis-users] Inconsistency between St_Value and ST_DumpAsPolygons

[Jean Marchal]

Ok, I will do it asap,

thanks again,

Jean

2013/6/6 dustymugs <dustymugs at gmail.com>

> 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 <dustymugs at 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 <dustymugs at 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.marchal at 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
> >>>>>
> >>>>> _______________________________________________
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> >>>>>
> >>>>>
> >>>>
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-- 
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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