[GRASS-user] r.watershed error

[Markus Metz]

Oops,

>
> Recommended reading:
> http://grass.osgeo.org/grass64/manuals/html64_user/rasterintro.html
> here the first part explaining the computational region
>
> and the g.region manual
> http://grass.osgeo.org/grass64/manuals/html64_user/rasterintro.html

http://grass.osgeo.org/grass64/manuals/html64_user/g.region.html

of course

>
> HTH,
>
> Markus
>
>>
>> Thanks for the help.
>>
>> Kurt
>> On May 24, 2010, at 4:37 AM, Markus Metz wrote:
>>
>>> On Sun, May 23, 2010 at 8:10 PM, Kurt Springs <ferret_bard at mac.com> wrote:
>>>> Problem was the resolution it starts working when I set it to 100m.  The dem
>>>> is ~69 x 27 km.
>>>
>>> Apparently, the dem has a resolution of 1/3 arcsec (~10m), maybe
>>> reprojected and resampled. With these extends, there would be about
>>> 186 million cells in the input map which is not a lot. I have
>>> successfully processed regions with ~250 million cells in memory and
>>> ~500 million cells in segmented mode. Make sure the current
>>> computational region matches the resolution of the input dem and the
>>> extends of the current computational region do not exceed the extends
>>> of the input map. Setting the computational region to a smaller area
>>> within the dem coverage is fine, as long as g.region -p align=NED13_01
>>> is used after adjusting the extends. A resolution of 100m throws away
>>> a lot of the information present in the original dem.
>>>
>>>
>>>> Thanks
>>>> On May 23, 2010, at 12:00 PM, Rich Shepard wrote:
>>>>
>>>> On Sat, 22 May 2010, Kurt Springs wrote:
>>>>
>>>> ERROR: G_malloc: unable to allocate 18446744070980740804 bytes at ...
>>>>
>>>>                                       ^^^^^^^^^^^^^^^^^^^^
>>>>
>>>> Any idea what I'm doing wrong?
>>>>
>>>> Kurt,
>>>>
>>>>   Look at the amount of memory your file wants to be allocated: several
>>>> Petabytes. How much area is covered by that DEM and at what resolution? Even
>>>> with GRASS compiled for large file support your file is _way_ too large.
>>>>
>>>> Rich
>>>>
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>>>>
>>>>
>>
>>
>