Le dimanche 11 mars 2012 à 16:31 +0200, Zirneklitis a écrit : > Hi, > > I have many raster maps (size 2000x2000 pixels). I have created a > virtual dataset including all of them. > > The first question: what pyramids should be built? > > 1. Large scale pyramids (e.g. 2 and 8 (in terms of gdaladdo) for each > raster map separately and small scale pyramids (e.g. 16 and 32) for the > Virtual data set. > > OR > > 2. Full set of pyramids for the Virtual data set. I have used this option with a large vrt made of 256x256 png tiles without any issue. Probably the easiest to do ( a few clicks). Then performant wise, maybe you have to try both.
Mayeul > > > The second question: Is it reasonable to make only every second pyramid > (e.g. 4, 16, 64)? - performance/disk waste issue. > > Thank You, > Karlis > > _______________________________________________ > Qgis-developer mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/qgis-developer _______________________________________________ Qgis-developer mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-developer
