[Qgis-user] RE: random crashes during editing

Thu May 27 00:03:48 PDT 2010

Hi,

I teach an introduction to GIS using qgis and we had random crashes, Osgeo4w
installer problems.  Very hard to trace the cause since the students could
not replicate the issues or properly describe what went wrong.

Cheers
michael

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Today's Topics:

   1. random crashes during editing (Paolo Cavallini)
   2. Re: random crashes during editing (nikos ves)
   3. Sv: Re: Sv: Re: [Qgis-user] Creating polygon from points in
      csv file (Ulf Almroth)
   4. Re: Sv: Re: Sv: Re: [Qgis-user] Creating polygon from points
      in	csv file (Goyo)

----------------------------------------------------------------------

Message: 1
Date: Tue, 25 May 2010 18:44:08 +0200
From: Paolo Cavallini <cavallini at faunalia.it>
Subject: [Qgis-user] random crashes during editing
To: <qgis-user at lists.osgeo.org>
Message-ID: <e60692da04ebb58575c49b77a87de86e at localhost>
Content-Type: text/plain; charset="UTF-8"

Hi all.
Today, during a course, we got a few random crashes, both on Debian and on
Windows, during editing, with topological editing, snapping, avoid
overlapping polygons all enabled. Very difficult to report, as I had little
time to check, and they are apprently difficult to replicate.
Has anybody had the same experience?
All the best.
-- 
http://faunalia.it/pc

------------------------------

Message: 2
Date: Tue, 25 May 2010 20:29:31 +0300
From: nikos ves <vesnikos at gmail.com>
Subject: Re: [Qgis-user] random crashes during editing
To: qgis-user at lists.osgeo.org
Message-ID: <1274808571.3041.2.camel at nikos-desktop>
Content-Type: text/plain; charset="UTF-8"

On Tue, 2010-05-25 at 18:44 +0200, Paolo Cavallini wrote: 
> Hi all.
> Today, during a course, we got a few random crashes, both on Debian and on
> Windows, during editing, with topological editing, snapping, avoid
> overlapping polygons all enabled. Very difficult to report, as I had
little
> time to check, and they are apprently difficult to replicate.
> Has anybody had the same experience?
> All the best.

Ye i had some crashes (random mostly) when adding data and/or editing
from databases. Im using SVN version. Console output was saying  about
"segmentation fault". Nothing else of value that could point at the
problem.

-- 
nikos ves <vesnikos at gmail.com>

------------------------------

Message: 3
Date: Tue, 25 May 2010 20:59:13 +0200 (CEST)
From: Ulf Almroth <ulf.almroth at lillabjoern.se>
Subject: Sv: Re: Sv: Re: [Qgis-user] Creating polygon from points in
	csv file
To: <goyodiaz at gmail.com>
Cc: qgis-user List <qgis-user at lists.osgeo.org>
Message-ID:
	<31848290.1374981274813953140.JavaMail.tomcat at ps11.han.skanova.net>
Content-Type: text/plain;charset="ISO-8859-1"

Hello Goyo,

I see I made a bad choice of sample file. The Z is the same in 
polygons because they represent small buildings. To create them the 
corners of the roofs were measured in the stereomodel resulting in the 
same z values. Of course a lot of objects have a common Z like lakes 
and shorelines and many others. The more general case is that Z i 
varying from ponint to point in the polygon or line. Think of polygons 
representing landuse or cadstral divisons or lines representing streams 
or roads. In this simple file structure a line looks like this:

STOLP  1868536.305  7323297.568  5.206  21
STOLP  1868514.063  7323234.352  2.558  22
STOLP  1868445.482  7323050.904  3.220  22
STOLP  1868514.063  7323234.352  2.558  23

The polygon differs rom the line in that the points with pencode 21 &v 
23 have the same coordinates indicating the closure. Point have the 
pencode 11 indicating no connection:

AHP,1868280.000,7323450.000,0.271,11
AHP,1868300.000,7323450.000,1.324,11
AHP,1868320.000,7323450.000,0.542,11

I tried to get those files into Qgis but with no complete succes. There 
is one plug in redings csv files ok but i does not take care of the 
topology and only reads X & Y.

Best regards

Ulf

----Ursprungligt meddelande----
Fren: goyodiaz at gmail.com
Datum: 2010-05-24 22:35
Till: "Ulf Almroth"<ulf.almroth at lillabjoern.se>
Kopia: "MORREALE Jean Roc"<jr.morreale at enoreth.net>, "qgis-user List"
<qgis-user at lists.osgeo.org>
Drende: Re: Sv: Re: [Qgis-user] Creating polygon from points in csv 
file

Hello Ulf,

El sab, 22-05-2010 a las 00:01 +0200, Ulf Almroth escribis:
> Hi,
> 
> Using an attribute is agood idea. A lot of measuring devices 
> generating ascii files with coordinates, e.g. various type of 
surveying 
> equipment and coordinate measuring devices 
> for industrial use produces file that basically look like this:
> 
> featuretyp, X,Y,Z,pencode
> 
> A sample file from a steroplotter used for mapping arial images with 
> sterooverlpa looks like this:
> 
> BBH  1868462.502  7323256.557  5.266  21
> BBH  1868458.596  7323265.540  5.266  22
> BBH  1868452.062  7323262.698  5.266  22
> BBH  1868455.967  7323253.716  5.266  22
> BBH  1868462.502  7323256.557  5.266  23
> BBH  1868359.027  7322916.789  6.259  21
> BBH  1868357.951  7322925.557  6.259  22
> BBH  1868351.513  7322924.767  6.259  22
> BBH  1868352.589  7322915.999  6.259  22
> BBH  1868359.027  7322916.789  6.259  23
> 
> where   21  signifies the styart of the polygon (or line) and 23 the 
> end.

Since the points are sorted you can just group by the Z field. Then you
get two polygons in this example without the need to look at the
pencode. Or maybe it's not as simple as I think?

I don't want to clutter the interface with more options without an use
case which makes them necessary.

Goyo

> 
> Regards 
> 
> Ulf Almroth
> 
> 
> ----Ursprungligt meddelande----
> Fren: goyodiaz at gmail.com
> Datum: 2010-05-20 00:03
> Till: "MORREALE Jean Roc"<jr.morreale at enoreth.net>
> Kopia: "qgis-user List"<qgis-user at lists.osgeo.org>
> Drende: Re: [Qgis-user] Creating polygon from points in csv file
> 
> El mii, 19-05-2010 a las 22:20 +0200, MORREALE Jean Roc escribis:
> > Hi Goyo,
> > 
> > I would like to test your file but I can't not extract the file 
from 
> the 
> > tar.bin, could you resend it using a more common format ?
> 
> The original author, Pavol Kapusta, uploaded (a new version of) it to
> the contributed repository so you should be able to install it using 
> the
> plugin installer (plugins > Install python plugins).
> 
> Please send bug reports and suggestion here or to me.
> 
> > 
> > Your modification is great as it would solve a major pain I've 
been 
> > dealing with my tacheometer's output, it is a basic ascii file 
where 
> > every record is a point to which you can append a codification.
> > 
> > For now we've to connect the point by hand, automating this task 
> would 
> > be a relief (and a lot less error prone).
> > 
> > Would it be easier to make a correct geometry by assigning a code 
to 
> the 
> > point telling if it's the opening or the closure ? Or just 
following 
> the 
> > incrementing point number would be enough to get a correct geometry 
?
> 
> As for now the plugin assumes the points are in the proper order.
> Sorting them by an attribute sounds like a good idea to me, I'?l 
think
> about it.
> 
> Goyo
> 
> _______________________________________________
> Qgis-user mailing list
> Qgis-user at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/qgis-user> 
> 
> 

------------------------------

Message: 4
Date: Wed, 26 May 2010 00:03:43 +0200
From: Goyo <goyodiaz at gmail.com>
Subject: Re: Sv: Re: Sv: Re: [Qgis-user] Creating polygon from points
	in	csv file
To: Ulf Almroth <ulf.almroth at lillabjoern.se>
Cc: qgis-user List <qgis-user at lists.osgeo.org>
Message-ID: <1274825023.3354.12.camel at goyo-laptop>
Content-Type: text/plain; charset="UTF-8"

El mar, 25-05-2010 a las 20:59 +0200, Ulf Almroth escribiC3:
> [...]
> Think of polygons 
> representing landuse or cadstral divisons or lines representing streams 
> or roads. In this simple file structure a line looks like this:
> 
> STOLP  1868536.305  7323297.568  5.206  21
> STOLP  1868514.063  7323234.352  2.558  22
> STOLP  1868445.482  7323050.904  3.220  22
> STOLP  1868514.063  7323234.352  2.558  23
> 
> The polygon differs rom the line in that the points with pencode 21 &v 
> 23 have the same coordinates indicating the closure. Point have the 
> pencode 11 indicating no connection:
> 
> AHP,1868280.000,7323450.000,0.271,11
> AHP,1868300.000,7323450.000,1.324,11
> AHP,1868320.000,7323450.000,0.542,11

I think I understand now. This seems to imply that we have to create
point, line and polygon shapefiles from the same input file. I think
this is a bit beyond the initial scope of the plugin and will need some
rethinking. Anyway I'll try to work on it when I have some spare time.

I'm setting a launchpad project for points2one and filed this as a
feature request:

https://bugs.launchpad.net/points2one/+bug/585604

Goyo

------------------------------

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