[postgis-devel] PostGIS Raster problem

David B�langer belanger_david at live.ca
Wed Oct 19 13:00:03 PDT 2011


Thank you ! I'm using the revision r7616. I will use the current revision.
 
David
 

> Date: Wed, 19 Oct 2011 12:36:46 -0700
> From: dustymugs at gmail.com
> To: postgis-devel at postgis.refractions.net
> Subject: Re: [postgis-devel] PostGIS Raster problem
> 
> On 10/19/2011 12:21 PM, David B�langer wrote:
> >
> > Hi,
> > I use the GDAL driver to extract a raster from PostGIS 2.0 but I got bad results. The x and y of the upper left corner and the resolution are bad. It seems that these properties have been rounded. This problem has appeared since the summer version of PostGIS 2.0. I didn't have this problem before. I think the problem is in the ST_MetaData() function which is used by the GDAL driver. I know that this function was modified this summer. The others functions (eg. ST_ScaleX, ST_ScaleY, ST_UpperLeftX...) give good results.
> >
> > I have compared the result of the summer version of PostGIS with the old version.
> > The results:
> > select ST_MetaData(rast)…:
> > Old version of database: "(-71.7501041666667,45.5001041666667,1200,1200,0.000208333333333333, 0.000208333333333333,0,0,4269,1)"
> > Database Since this summer: "(-71.750104,45.500104,1200,1200,0.000208, -0.000208,0,0,4269,1)"
> > The result of the old version of the database is the truth.
> >
> > Does anyone know this problem and can you help me?
> >
> > Thanks !
> > David 
> >
> >
> 
> What revisions of PostGIS trunk are you using? I rewrote the 
> ST_Metadata function over the summer and had to tweak it some time 
> afterwards due to how the values were getting rounded depending on how 
> the C function returned (Datums vs. CStrings).
> 
> After digging through the logs, you'll want to be using r7638 
> (7/14/2011) or more recent to ensure that your answers are correct.
> 
> -bborie
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