On Mon, Jan 14, 2013 at 2:47 AM, Jukka Rahkonen <jukka.rahko...@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- > > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/gdal-dev -- http://www.keittlab.org/
_______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
