[GRASS-user] Large Grass Raster Notes

[Anna Petrášová]

Hi,

On Sat, Jan 17, 2015 at 7:00 PM, 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. At first I thought it was a limitation of being
> overwhelmed with small sector requests and purchased a terabyte SSD, copied
> the external imagery to the SSD, but that didn’t noticeably help.
> Throughput was way less than 1mb/sec.
>
> 3. g.remove is unusable for long lists. Actually applies to I think any
> utility that takes a list for input. I wish I could just put it to a file
> so it could parse it line by line (As I understand the issue it is a
> limitation of the insanely long shell arguments).
>

maybe silly question regarding g.remove, have you used the pattern option
instead of the name option?

Best,

Anna


> If anyone wants me to elaborate on anything, or has pointers how to do
> things better - please let me know!
>
>
> Cheers,
>
> Jeshua Lacock
> Founder/Engineer
> 3DTOPO Incorporated
> <http://3DTOPO.com>
> Phone: 208.462.4171
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