[GRASS-user] Problem with r.basin in grass7

[Markus Neteler]

Hi Andrea,

On Fri, Oct 24, 2014 at 3:27 PM, Andrea Timmermann <timmermann at gmx.at> wrote:
> Hi Markus,
>
> Thanks for your answer! I have now however another problem ...
> When running:
>
> r.basin map=map at Elevation prefix=o coordinates=-71.10394196,43.9865230801
> threshold=19005 dir=C:\\Users\\Andrea\\Basins
>
> I get:
> " ....
> v.to.rast complete.
> All in RAM calculation...
> Reading raster map <o_map_drainage_e>...
> Calculating basins using vector point map...
> Current region rows: 21612, cols: 21612
> ERROR: G_calloc: unable to allocate 21612 * 4 bytes of memory at io.c:41

So, starting with GRASS 7 revision r62444 (see startup screen or
g.version -g) you will be told *which* module actually failed, so the
G_calloc error will be more useful. To get that, you will need to
update your GRASS GIS 7 installation.

However, a few thoughts before:

Current region rows: 21612, cols: 21612
i.e. 467078544 cells at 24 bytes/cell (AFAIK). That is:

> 467078544 * 24 / 1024 / 1024/ 1024
[1] 10.44002

Leaving a bit for the operating system etc, you may exceed 12GB RAM if
I got the numbers right.

Are you sure that you want to use 467 million cells? If not, check
"g.region -p", perhaps the computational region resolution is too
high?

best
Markus