[Qgis-developer] [Qgis-user] Pyramids and Virtual maps -
mayeul.kauffmann at free.fr
Sun Mar 11 14:44:56 EDT 2012
Le dimanche 11 mars 2012 à 16:31 +0200, Zirneklitis a écrit :
> 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.
> 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.
> The second question: Is it reasonable to make only every second pyramid
> (e.g. 4, 16, 64)? - performance/disk waste issue.
> Thank You,
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> Qgis-developer at lists.osgeo.org
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