[GRASS-user] Large Grass Raster Notes

[Markus Neteler]

On Sun, Jan 18, 2015 at 1:00 AM, Jeshua Lacock <jeshua at 3dtopo.com> wrote:
>
> Greetings,
>
> In the event my experience working with rather large GRASS rasters may be useful, I thought I would share it. The following notes were compiled running the  GRASS 7.0.0beta4-141230 package on Mac OS X 10.10.1. The system is a 6-core Xeon with 32GB of RAM, running in full 64-bit mode.
>
> 1. Using an r.external virtual mosaic as the input proved impossible trying to run r.resample on it on trying to produce a nearly teracell raster (I ended up breaking sub-tiles). I closely followed the instructions on the Wiki.
>
> 2. On smaller sub-tiles of said image, r.resample was insanely slow even with the external imagery.

You may check/benchmark the other resampling modules, some of them may
be more modern (ideally faster):

http://grass.osgeo.org/grass70/manuals/keywords.html#resample

In case you try, please share the outcome.

cheers,
Markus