[Qgis-user] Raster Math on very very large files

[Nicolas Cadieux]

Hi,

In the next few weeks, I will be trying to do some Raster Math on some very large Rasters.  Rasters will likely be too large for the system memory (72Go).  I will have a PCIe solid state drive to help out.

Does anyone know how QGIS will manage?  Can we use the raster calculator without loading the files into memory? Can the Python api solve this problem?

Doing the math on subsets of the data could help but I still need to process the entire extent at some point to get to the raster statistics.

I know I can use the R Raster package to do it but that package is not flexible when dealing with grids with different resolutions. 

Any thoughts on this would be appreciated.

Thanks

Nicolas Cadieux M.Sc.
Les Entreprises Archéotec inc. 
8548, rue Saint-Denis Montréal H2P 2H2
Téléphone: 514.381.5112  Fax: 514.381.4995