On 28/10/08 17:13, Milton Cezar Ribeiro wrote:
Dear Markus,
Thank your for your reply.
I agree completely with you. But I can handle a file with almost
4.500.000 polygons (=area?) on ArcGis. Have you any suggestion of how
can I skipt this trouble?
Do you have access to an equivalent (in terms of hardware) GNU/Linux box
to test whether you see the same issue ?
You could also detach the attribute table from the map (v.db.connect -d)
and see if this solves the problem.
For your info: on my GNU/Linux box exporting 20,000 polygons with
attributes takes about 3 minutes, but without attributes only 5 seconds
and 120,000 polygons without attributes 15s. So, most of the time seems
to be spent with writing the dbf file.
[some testing...]
Actually it's mainly reading the dbf file that takes time. If I put the
(20,000 polygon) attribute data into an sqlite database, export "only"
takes 53s and with postgres 1min26s. Whereas with a dbf attribute table,
export takes roughly the same time whatever the format (tried GML, DGN,
MapInfo - but the latter also uses dbf if I'm not mistaken.)
And I seem to remember that there were some issues with the DBF driver
in windows.
Moritz
Best wishes,
miltinho
2008/10/28 Markus Neteler <[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>>
miltinho,
remember the 100000 areas - a non-trivial size.
Markus
On Tue, Oct 28, 2008 at 3:51 PM, Milton Cezar Ribeiro
<[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
> Hi GRASS-gurus,
> I tryed the command again, using the GRASS MSYS console, and
I noticed that
> when my output command reach what I think is the "end" of
task, the GRASS
> don´t finish it. So, The command appear stay in loop, and it
never finish.
> And if I copy the files and try to open it on ArgGis - I
really need it :-(
> - the ArcGis don´t understand the format.
> Any suggestion?
> miltinho
> brazil
>
> 2008/10/28 Milton Cezar Ribeiro
<[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>>
>>
>> Dear All,
>> I am running native WinGrass and I am trying
>> to export a vector map (with 100.000 areas).
>> The command below is what I am using.
>> v.out.ogr input=myvect dsn=c:/temp olayer=myexport type=area
>> But after a all nigth long the command not finish
>> and now update is done on the output files (which
>> have about 80MB) since after 20minutes I start the command.
>> Any help are welcome.
>> Best wishes,
>> miltinho astronauta
>> brazil
>
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