Thu, Jul 20 2006
15:39:11
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Request created by guest
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Subject: pacthing multiple vectors with areas doesn't result in a vector with
areas
Platform: Mac OSX
grass binary for platform: Downloaded precompiled Binaries
GRASS Version: 6.0.0
I got several vectors containing polygons with areas features.
I apply v.patch in order to obtain a single vector file but when I ask GRASS
to draw areas I see there are several "hole" in the result vector.
I tried to apply v.clean to the single vectors, but even if I have all my single
vectors files with their areas the resulting map still contains some "holes".
Sometimes boundaries disappear after applying v.patch too. |
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Thu, Jul 20 2006
20:25:28
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Mail sent by msieczka
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1st - don't hurry to report a problem as bug, OK? How do you know it is a bug?
First check the grass-user archive, then if the solution is not there ask on
grass user list.
For this single problem let's leave as it is. But in future - please take care.
Back to the point - can you try Grass 6.1 and see if you are able to reproduce
the problem? If you can't try 6.1/the problem persists in 6.1, send me a
location whith a mapset containing the data in question and the PERMANENT
mapset with only the projection info, na data in it. I'll see what is going
on, if I can.
Maciek
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Fri, Jul 21 2006
09:38:51
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Fri, 21 Jul 2006 09:39:46 +0200
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Raffaele Morelli <raffaele.morelli@apat.it>
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Maciek Sieczka via RT <grass-bugs@intevation.de>
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Subject |
Re: [bug #4882] (grass) pacthing multiple vectors with areas doesn't result in a vector with areas
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I was trying to help you improve GRASS, as it's wrote on the site where
I downloaded 6.1cvs, however, I will take care in the future.
The point is that I tried with 6.0.0 and 6.1 cvs on MacOSX and with
6.0.2 on debian and got the same problem.
Now I am going to ask on the list, first I send you a location.
Thank you
raffaele
> 1st - don't hurry to report a problem as bug, OK? How do you know it is a bug?
> First check the grass-user archive, then if the solution is not there ask on
> grass user list.
>
> For this single problem let's leave as it is. But in future - please take care.
>
> Back to the point - can you try Grass 6.1 and see if you are able to reproduce
> the problem? If you can't try 6.1/the problem persists in 6.1, send me a
> location whith a mapset containing the data in question and the PERMANENT
> mapset with only the projection info, na data in it. I'll see what is going
> on, if I can.
>
> Maciek
>
>
> -------------------------------------------- Managed by Request Tracker
>
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Sun, Jul 23 2006
23:06:06
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Mail sent by msieczka
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raffaele.morelli@apat.it wrote (Fri, Jul 21 2006 09:38:51):
> I was trying to help you improve GRASS, as it's wrote on the site where
> I downloaded 6.1cvs, however, I will take care in the future.
Ok, sorry if was too jumpy (I think I was).
> The point is that I tried with 6.0.0 and 6.1 cvs on MacOSX and with
> 6.0.2 on debian and got the same problem.
> Now I am going to ask on the list, first I send you a location.
I haven't received anything yet from you. Maybe because I forgot to give you
my email: tutey at o2.pl
Maciek
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Tue, Aug 15 2006
01:26:55
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Mail sent by msieczka
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Raffaele,
Did you solve this problem? What is the status?
Maciek
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Mon, Aug 21 2006
09:32:38
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Mon, 21 Aug 2006 09:34:54 +0200
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RaffaeleMorelli <raffaele.morelli@apat.it>
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Maciek Sieczka via RT <grass-bugs@intevation.de>
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Subject |
Re: [bug #4882] (grass) pacthing multiple vectors with areas doesn't result in a vector with areas
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Hi Maciek.
Sorry, but I leaved to have holidays and didn't send you feedbacks.
I didn't solve the problem and don't know if I can.
I summarize briefly the whole process:
1. got several shapes from overall Italy, 103 provinces, with dimensions
ranges from 10Mb to 25Mb.
2. used v.in.ogr to import and v.clean (with rmarea,bpol,rmdupl,rmsa)
3. because of shapes contained sub-polygons for the same villages, I
needed to merge these polygons (which share the same category) and
dissolve common boundaries in order to obtain only the entire town area
and so I did it with v.extract
4. I obtained several shapes representing each town area and then
patched them altogether
5. after patching I didn't obtained what a vector map with all polygons
having area feature.
I made hundreds of trial using different values for parameters in
v.clean in step 2 and every time obtained similar errors, sometimes with
few polygons but every time something went wrong.
I guess that topology breaks (is the right way to call that?) when
polygons overlaps.
I used v.overlay to investigate and obtained something to work with, but
with thousand of intersection I do not need!!
Am I right? May the problem be in the original shapes?
Next week I will be at work again and be able to post you a location
(sorry but here at home I am a 56k little "geek").
Thanx
Raffaele
Maciek Sieczka via RT wrote:
>Raffaele,
>
>Did you solve this problem? What is the status?
>
>Maciek
>
>
>
>-------------------------------------------- Managed by Request Tracker
>
>
>
>
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