[GRASS-user] v.buffer problem (bug?)

GRASS GRASS user
,
1

I'm using Grass 6.4.0 and I'm trying to generate a buffer for a polyline
vector map. The problem is that v.buffer runs but it doesn't end. I give it
a lot of time (+2 hours) but it didn't finish. Using the same file in QGIS
the job done in less than a minute. What could be the problem? Is this a
bug?

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2

On Wed, Mar 23, 2011 at 7:26 AM, leonidas <leonidas_liakos@yahoo.gr> wrote:

I'm using Grass 6.4.0 and I'm trying to generate a buffer for a polyline
vector map. The problem is that v.buffer runs but it doesn't end. I give it
a lot of time (+2 hours) but it didn't finish. Using the same file in QGIS
the job done in less than a minute. What could be the problem? Is this a
bug?

Likely yes. Could you please try the 6.4.1RC2 package? This bug was fixed
http://trac.osgeo.org/grass/ticket/994

Perhaps also the former version of v.buffer (the current version is a rewrite)
will be reactivated since it got fixed and performs better:
http://trac.osgeo.org/grass/ticket/699

In any case a test with 6.4.1RC2 is recommended.

Markus

3

Thank you Markus, I'll check it!

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4

I'm trying to upgrade to GRASS 6.4.1RC2 following the instructions at
https://launchpad.net/~ubuntugis/+archive/ubuntugis-unstable?field.series_filter=lucid
But grass --version command reports that the version is GRASS GIS 6.4.0
Did I make any mistake?

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5

Markus Neteler:

On Wed, Mar 23, 2011 at 7:26 AM, leonidas <leonidas_liakos@yahoo.gr> wrote:

I'm using Grass 6.4.0 and I'm trying to generate a buffer for a polyline
vector map. The problem is that v.buffer runs but it doesn't end. I give it
a lot of time (+2 hours) but it didn't finish. Using the same file in QGIS
the job done in less than a minute. What could be the problem? Is this a
bug?

Likely yes. Could you please try the 6.4.1RC2 package? This bug was fixed
http://trac.osgeo.org/grass/ticket/994

Perhaps also the former version of v.buffer (the current version is a rewrite)
will be reactivated since it got fixed and performs better:
http://trac.osgeo.org/grass/ticket/699

This bug is still present in v.buffer2 and v.parallel2, only v.buffer
/ v.parallel in 6.5 will finish in this case, but v.buffer /
v.parallel in 6.5 is still deactivated by default because some
features still need to be ported from v.buffer2 to v.buffer. To be
done in 6.5, then backported to 6.4.

Markus M

6

So, what should I do to run successfully the buffer?

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7

leonidas wrote:

So, what should I do to run successfully the buffer?

You could compile 6.5 from source, then go to vector/v.buffer, run
make in that directory, optionally install grass and use v.buffer
instead of v.buffer2.

8

Ok, thank you all! I did it!

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