[gdal-dev] Spatial index to raster VRT

Jukka Rahkonen jukka.rahkonen at maanmittauslaitos.fi
Fri May 27 07:31:00 PDT 2016

Even Rouault <even.rouault <at> spatialys.com> writes:

> On Thursday 26 May 2016 13:26:38 Jukka Rahkonen wrote:

> > 
> > VRT supports one overview, but that can itself be a VRT, which in turn can
> > point to next VRT overview and so on.
> Actually, this is not true (although I might have in the past say so). The
> currently states :
> """
> Overview: This optional element describes one overview level for the band. It 
> should have a child SourceFilename and SourceBand element. The SourceFilename 
> may have a relativeToVRT boolean attribute. Multiple elements may be used to 
> describe multiple overviews. 
> """
> and I've verified it works (at least they are reported by gdalinfo)

Confirmed by adding several tiff files with increasing pixel size as
Overview elements into the same VRT. Works fine. Still missing the main
thing - spatial index for making access to small region fast with thousands
or images in VRT.


> Even

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