[gdal-dev] GDAL GeoPackage raster support

[Even Rouault]

Le mercredi 17 décembre 2014 13:18:16, Even Rouault a écrit :
> Le mercredi 17 décembre 2014 13:03:13, Pepijn Van Eeckhoudt a écrit :
> > On 17/12/14 11:18, Even Rouault wrote:
> > > In the update scenario like gdaladdo, an optimization that is used when
> > > creating the file from scratch (gdal_translate) isn't applied. You can
> > > try adding "--config OGR_SQLITE_SYNCHRONOUS OFF" on the gdaladdo
> > > command line. I suspect this must be the issue. I was a bit hesitant
> > > to apply it by default in update cases since it means that a
> > > interruption of the process (ctrl-c) could damage the database. But
> > > this is generally the case for other formats, so we probably could
> > > apply it too.
> > 
> > Not sure if this is feasible in GDAL, but what I did in my own code is
> > to use transactions to speed things up. All the tile inserts are batched
> > in transactions of 100 tiles or so.
> > I had a look at the driver code, but it wasn't immediately clear to me
> > if this is already happening or not. Doesn't look like it though.
> 
> No, it doesn't for now. Could indeed be a potential optimization.

Implemented now. Greatly improves performance of overview creation indeed.

> 
> > Pepijn
> > _______________________________________________
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> > gdal-dev at lists.osgeo.org
> > http://lists.osgeo.org/mailman/listinfo/gdal-dev

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