On mercredi 1 mars 2017 11:43:12 CET Rahkonen Jukka (MML) wrote:
> Forwarding to the list because Jordan's trial was not successful.
Sounds a good idea. I think potential students should be more pro-active in
proposing and
developing their own ideas.
Regarding "indexing on VRT files", I guess this is about spatial indexing of
sources in a VRT
file. My bet would be that the size of VRT files that would need such indexing
would be so
large than their parsing would be the most limiting factor. But I can be wrong.
Some people who want to make a mosaic from a huge number of tiles do that by
making
VRTs of VRTs of VRTs with a pyramid structure to avoid parsing a lot of XML and
still having
good performance.
Another option that has been mentionned in the past would be to have a
variation of the
VRT syntax that would reference a tile index (shapefile or any OGR datasource)
and would
thus benefit from its spatial indexing & filtering capabilities
Something like:
<VRTDataset rasterXSize="20000" rasterYSize="20000">
<SRS>EPSG:26711</SRS>
<GeoTransform> 4.4072000000000000e+05, 6.0000000000000000e+01,
0.0000000000000000e+00, 3.7513200000000000e+06, 0.0000000000000000e+00,
-6.0000000000000000e+01</GeoTransform>
<TileIndex>
<Filename relativeToVRT="1">index.shp</Filename>
<!-- <Layername>index</Layername> -->
</Tileindex>
<Overview rasterXSize="10000" rasterYSize="10000">
<TileIndex>
<Filename relativeToVRT="1">index_ovr_2.shp</Filename>
</Tileindex>
</Overview>
<Overview rasterXSize="5000" rasterYSize="5000">
<TileIndex>
<Filename relativeToVRT="1">index_ovr_4.shp</Filename>
</Tileindex>
</Overview>
<VRTRasterBand dataType="Byte" band="1">
<ColorInterp>Red</ColorInterp>
</VRTRasterBand>
<VRTRasterBand dataType="Byte" band="2">
<ColorInterp>Green</ColorInterp>
</VRTRasterBand>
<VRTRasterBand dataType="Byte" band="3">
<ColorInterp>Blue</ColorInterp>
</VRTRasterBand>
</VRTDataset>
Even
> Jordan Bess wrote:
> Re: [gdal-dev] Don't we have any ideas for GSoC 2017?
>
>
> Vector tiles! Mbtiles or folder of pbf
>
> It would be great if OGR supported creation of vector tiles in protocol buff
> format
>
> Get Outlook for Android<https://aka.ms/ghei36>
>
> ________________________________
> From: gdal-dev
> <[email protected]<mailto:[email protected]>>
> on behalf of Casper Børgesen (CABO) <[email protected]<mailto:[email protected]>>
> Sent: Tuesday, February 28, 2017 5:16:19 AM
> To: Rahkonen Jukka (MML); '[email protected]'
> ([email protected]<mailto:[email protected]>) Subject: Re:
> [gdal-dev] Don't we have any ideas for GSoC 2017?
>
> Hi,
>
> I don't know if the idea is too simple, but implementing indexing on VRT
> files would be great to have. I thinks it's currently a feature request.
>
>
> Regards, Casper
>
>
> -----Original Message-----
> From: gdal-dev [mailto:[email protected]] On Behalf Of
> Rahkonen Jukka (MML) Sent: 28. februar 2017 09:07
> To: '[email protected]'
> ([email protected]<mailto:[email protected]>) Subject:
> [gdal-dev] Don't we have any ideas for GSoC 2017?
>
> Hi,
>
> OSGeo is accepted as an organization for the Google Summer of Code 2017 but
> there are no GDAL related ideas on
> https://wiki.osgeo.org/wiki/Google_Summer_of_Code_2017_Ideas. Could we
> raise some of the old ideas or discover some brand new ones?
>
> -Jukka Rahkonen-
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