[GRASS5] [aaime@libero.it: [GRASS-bugs] vector files: topology rulesbroken]

[Andrea Aime]

Hi everybody,
in fact I read only after submitting bug that v.spag detects
line crossings, but... if I use v.spag over a vector file
containing only two lines crossing I end up with a new vector
file with lots of lines and nodes (much more than 4 lines and
5 nodes that I expected). I was still using grass5beta8, if
that bug has already been corrected, I apologize... I'm
downloading beta11, tomorrow I will made another try.
Bye
Andrea

Markus Neteler wrote:
> 
> Hi vector gurus,
> 
> find attached a vector bug which seems to need our attention.
> Maybe it's an v.spag issue?
> 
> Thanks,
> 
>  Markus
> 
>   ------------------------------------------------------------------------
> 
> Subject: [GRASS-bugs] vector files: topology rules broken
> Date: Thu, 15 Feb 2001 15:36:43 GMT
> From: aaime at libero.it ()
> Reply-To: grass-bugs at geog.uni-hannover.de
> To: grass-bugs at geog.uni-hannover.de, grass-bugs at intevation.de
> 
> Below is the result of your feedback form.  It was submitted by
>  (aaime at libero.it) on Thursday, February 15, 2001 at 15:36:43
> ---------------------------------------------------------------------------
> 
> subject: vector files: topology rules broken
> 
> area: grass5beta11
> 
> platform: Linux/Intel
> 
> vendor: RedHat
> 
> cputype: Intel (i486, i586, pentium ...)
> 
> xwindows: Xfree 4.0.1
> 
> windowsmanager: KDE 2.x
> 
> tcltkver: -- select --
> 
> grassserver: Hannover site
> 
> grassversion: Linux/Intel binaries
> 
> cvsyesno: -- select --
> 
> compiler: -- select --
> 
> bugreport: Documentation (GRASS programmer manual, "Vector Maps" claims that vector files are made of nonintersecting curves, and a "Topology
> rule" says that arcs should not cross each other. That's a standard
> planar enforcement rule but... it's not enforced! I have digited
> a file with 2 crossing lines, run v.support and it's still saying
> "2 lines, 4 nodes". v.digit displays only four nodes. So, GRASS
> does not split lines at crossing, and it doesn't create a node in
> the crossing, nor it refuses to accept that bogus file.
> 
> name: Andrea Aime
> 
> ---------------------------------------------------------------------------
> 
> REMOTE_HOST: monet7-176.comune.modena.it
> 
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