[gdal-dev] does gdal support multiple simultaneous writers to raster

[Tim Keitt]

On Mon, Jan 14, 2013 at 2:47 AM, Jukka Rahkonen
<jukka.rahkonen at mmmtike.fi>wrote:

> Kennedy, Paul <P.Kennedy <at> fugro.com.au> writes:
>
> >
> >
> > Hi
> > Simultaneous writers would be a better long term solution as we often
> improve
> the raster following initial creation. This improvement may well be a
> filter run
> on a sub region ( eg a despeckle) or updating a piece of the dtm with
> better
> information or even some manual edits as a last resort.
> > I can imagine a Hadoop style map/reduce would fit nicely into your sub
> window
> idea. Regardspk
>
> Hi,
>
> Just thinking that while updating pieces of a massive target raster file
> with
> several simultaneous writers could probably be doable and make sense with
> coverage data like dtm, the advantage is not as great with raster maps and
> aerial/satellite image mosaics which need also overviews for effective
> practical
> use. I guess that piecewise automatic updating of overviews could be
> somewhat
> complicated thing to implement. Perhaps raster database formats like
> PostGIS
> raster or Rasterlite would suit better for this sort of update operations.
>

We've found postgis and most other similar solutions to be a bottleneck
when working with massive grids and meshes. We're looking more and more at
parallel HDF5 and ROMIO.

THK


>
> -Jukka Rahkonen-
>
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