[postgis-users] st_union(rast) returning null because of non alignment,

[Rhys A.D. Stewart]

Pierre,

If by on the same grid you mean equal, then no hey are not. Here they are.

1: POLYGON((766242.610093044 641994.463110607,779742.610093044
641994.463110607,779742.610093044 648494.463110607,766242.610093044
648494.463110607,766242.610093044 641994.463110607))
2:POLYGON((698486.043582936 617384.893096908,736736.043582936
617384.893096908,736736.043582936 674634.893096908,698486.043582936
674634.893096908,698486.043582936 617384.893096908))

Thanks,

Rhys


On Wed, Nov 7, 2012 at 5:40 PM, Pierre Racine
<Pierre.Racine at sbf.ulaval.ca>wrote:

> Hi Rhys,
>
> Both rasters must also have their upperlefx and upperlefty on the same
> grid.
>
> Could you do:
>
> SELECT ST_AsText(ST_ConvexHull(rast))
>
> on both rasters and post the result here?
>
> Thanks,
>
> Pierre
>
> > -----Original Message-----
> > From: postgis-users-bounces at lists.osgeo.org [mailto:postgis-users-
> > bounces at lists.osgeo.org] On Behalf Of Rhys A.D. Stewart
> > Sent: Wednesday, November 07, 2012 5:33 PM
> > To: PostGIS Users Discussion
> > Subject: [postgis-users] st_union(rast) returning null because of non
> alignment,
> >
> > Greetings,
> >
> > according to the trusty docs online two rasters are aligned when they
> share the
> > same skew, scale and srid. Created a raster using st_asraster  and
> according to
> > st_metadata scale, skew and srid are all equal. Howvere st_unon complains
> > saying that 'The two rasters provided do not have the same alignment.
> > Returning NULL'
> >
> > I noticed that  ticket #1336 as possibly relating to my issue, but I'm
> not entirely
> > sure. My posgis version is:
> > POSTGIS="2.0.0 r9605" GEOS="3.3.3-CAPI-1.7.4" PROJ="Rel. 4.8.0, 6 March
> > 2012" GDAL="GDAL 1.9.0, released 2011/12/29" LIBXML="2.7.8"
> > LIBJSON="UNKNOWN" TOPOLOGY RASTER
> >
> >
> > What am I missing or doing incorrectly?
> >
> > Regards,
> >
> > Rhys
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