[Qgis-user] Remove duplicate lines

[Jerry Ng]

Greetings,

I have a file converted from dwg that there exists a lot of overlap or
duplicate lines.

Could anyone have ideas to deal with this?

Jerry
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Re: [Qgis-user] Question On "BallPark Transform"

[Nyall Dawson]

On Fri, 28 Feb 2020 at 03:56, Randal Hale
 wrote:
>
> Greetings,
>
> I received an email from two users with 3.12 asking about "Ballpark 
> Transformations" - the exact phrase was "Used a Ballpark transformation from 
> EPSG:4326 to EPSG: 2274".
>
> I've been able to generate the message twice by:
>
> changing the projection of a new project with no data from 4326 to 2274
> adding data with an incorrect spatial extent that I believe was in 4326 and 
> applied to a project in 2274 (I think - I currently don't have access to that 
> data to confirm)

Any chance you could file a bug report with a process I can use to
reproduce this? I'll look into it if you can...

Nyall
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[Qgis-user] Stream to feature problem

[ming han]

Hi all

Is qgis has a function like "stream link" in Arcgis which can convert
the stream raster to feature.
I tried with raster to vector function in grass and qgis. it has
following errors.

Cheers
Ming

[image: image.png]
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Re: [Qgis-user] QGIS uninstalled after GDAL PPA install

[J. M]

Hi there guys,

I think I've done everything that people have suggested, including Andre's
last suggestion:
sudo apt-get install libgdal20=2.2.3+dfsg-2, which returned this, similar
to last time:

sudo apt-get install libgdal20=2.2.3+dfsg-2
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies.
 libgdal20 : Depends: libogdi3.2 (>= 3.2.0) but it is not going to be
installed
E: Unable to correct problems, you have held broken packages.

As I can't get beyond that point I have no idea what else to try, to be
honest. As Ben suggested I edited the etc file to include this:
deb https://qgis.org/ubuntu-ltr bionic main, because Ubuntu 18.04 LTS
doesn't yet support QGIS 3.12. If you can install QGIS and run it, then how
do you simply remove the entire program and all its dependencies so that
you can start from scratch? If I run purge X on any other program I think
my system removes it completely, though I'm not sure.

Fernando Moxo suggested the following, but I've already run sudo apt-get
autoremove qgis (as QGIS wasn't the last program I installed and I don't
want this process to randomly erase vital dependencies and leave me with
half an OS) and there are fewer unmet dependencies now than the first time,
but I don't know what 'installed prereq.' means, or 'Id those prereq'.
Sorry, I can't act on that line because I don't understand it.

sudo apt autoremove

Should uninstall all dangling installed prereq.   Id those prereq are
being kept due to some other package requiring them, or some remaining
from previous Qgis install it can take a bit more effort to fix.


I don't know how to erase individual dependencies, so without specific
commands I wouldn't know where to start. I ran autoremove and I thought it
took out everything, even dependencies unrelated to QGIS. Out of curiosity,
are the majority of QGIS users software developers as well? I've never
experienced this level of technical difficulty associated with the
installation of a piece of software on Linux before (I've been a dedicated
Ubuntu user since 12.04 LTS).

Could someone recommend where to start from scratch, and suggest what to do
step-by-step, so I'm not cluttering up the group email with the same
queries for ages? I had it working perfectly (albeit briefly) before I
accidentally installed the ubuntugis-unstable PPA, so I know it's not a
problem with my OS.
Many thanks again,
Jimi.



On Thu, Feb 27, 2020 at 1:10 PM Fernando M. Roxo da Motta 
wrote:

> On Wed, 26 Feb 2020 12:33:24 +0800, Ben Hur Pintor 
> wrote:
>
>
> > Hi!
> >
> > It looks like your machine is trying to install 3.12.
>
>   This kind of error usually indicates that 3.12 is already
> installed.  Prossibly a previous install brought in the 3.12 version as
> a pre-requirement.   If that is so, a command like:
>
> $ sudo apt autoremove
>
> Should uninstall all dangling installed prereq.   Id those prereq are
> being kept due to some other package requiring them, or some remaining
> from previous Qgis install it can take a bit more effort to fix.
>
>   Try to remove directly each of those dependencies.
>
>
>   HTH
>
> >
> > As I mentioned in the last part of my previous message, right now you
> > can't install QGIS 3.12 on Ubuntu 18.04 because 3.12 needs PROJ 6.3.1
> > which currently isn't available in Bionic -- via the main canonical
> > repo or even with the ubuntugis-unstable PPA. Therefore, I suggest
> > installing from the LTR branch and not the LR branch. When I use the
> > LTR branch with ubuntugis dependencies, I get QGIS 3 10.2 no problem.
> >
> > I run the same machine as you and actually faced the same problem
> > when I tried to install the Latest Release (3.12) on Bionic. Try
> > using the repos for the LTR (the ones with -ltr in the end). Maybe
> > that will help.
> >
> > Don't worry about it, we've all been there.
> >
> >
> > All the best,
> > Ben Hur
> >
> > On Wed, Feb 26, 2020, 07:12 J. M  wrote:
> >
> > > Hi Ben,
> > >
> > > No joy, I'm afraid. I think I did everything you recommended. I'm
> > > going to run through it in case I missed something obvious:
> > >
> > >- I ran sudo apt remove qgis grass qgis-plugin-grass, then ran
> > > sudo apt-get update
> > >- The /etc/apt/sources file contains the correct info because I
> > >modified it for the last installation
> > >- I ran autoremove on QGIS and erased over a gigabyte of
> > >dependencies (which seemed like a *lot*..)
> > >- I ran sudo apt-key list to check if the ubuntugis-unstable PPA
> > > was still listed as trusted, and it didn't appear
> > >- I added the ubuntugis stable PPA as recommended on
> > >

[QGIS-it-user] Esportare file shp in dxf

[gius . pippo1989]

Salve sto cercando di esportare degli shp in qgis 3.4 in dxf. Ho provato sia il 
metodo PROGRAMMA-IMPORTA/ESPORTA-ESPORTA PROGETTO IN DXF-selezione lo shp punti 
che mi interessa e avvio l'esportazione, quando apro il file dxf in autocad la 
dimensione dei punti è fissa e sono molto grandi. Ho provato anche il metodo 
save as direttamente dal tasto destro del shp punti che mi interessa, ma quando 
lo apro in autocad non compare nulla.
Come posso fare per avere il file punti in dxf in maniera da poterci lavorare?
Grazie
Giuseppe
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[Qgis-user] Question On "BallPark Transform"

[Randal Hale]

Greetings,

I received an email from two users with 3.12 asking about "Ballpark 
Transformations" - the exact phrase was "Used a Ballpark transformation 
from EPSG:4326 to EPSG: 2274".


I've been able to generate the message twice by:

 * changing the projection of a new project with no data from 4326 to 2274
 * adding data with an incorrect spatial extent that I believe was in
   4326 and applied to a project in 2274 (I think - I currently don't
   have access to that data to confirm)

I've found mention of it here: 
https://qgis.org/api/classQgsCoordinateTransform.html#a16adb051fafc25058c0040a310f1606b 



The expanded message in QGIS is:

/*An alternative, ballpark-only transform was used when transforming 
coordinates between *//*EPSG:4326 - WGS 84*//*and *//*EPSG:2274 - NAD83 
/ Tennessee (ftUS)*//*. The results may not match those obtained by 
using the preferred operation:*//**/


/*Possibly an incorrect choice of operation was made for transformations 
between these reference systems. Check the Project Properties and ensure 
that the selected transform operations are applicable over the whole 
extent of the current project.*/


If I check the project properties there is no Datum Transformation 
defined after all this happens.


I'm assuming that if a project has no data and one jumps datums by 
changing the projection it's saying "Hey since there is no data this 
transformation is a "ballpark" i.e. not exact". Is there a preferred way 
to dealing with this after it happens?


Randy

--
Randal Hale
rjh...@northrivergeographic.com
(p) 423.653.3611
http://www.northrivergeographic.com

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Re: [Qgis-user] QGIS Indonesia Meetup #1

[Muhammad Iqnaul Haq]

Thanks for spreading the good news Ismail! Helping us to support the QGIS
Indonesia User Group since the first time.

We hope QGIS Indonesia user group can contribute more to QGIS Project,
shares ideas and communicate with other QGIS user groups.

If anyone interested to join our 1st meetup, you may watch the live
streaming on our youtube channel *http://bit.ly/qgisid-youtube
* which will be live on Sat Feb 29 at 9am
(GMT +7).

Appreciate your support guys!
Best regards

M Iqnaul

On Thu, Feb 27, 2020, 1:57 PM Ismail Sunni  wrote:

> Dear all,
>
> First, please apologize me if this post may not be in suitable for this
> mailing list and perhaps not interesting for most of the member :)
>
> I just want to share *the first QGIS Indonesia meet up*. It will be held
> at *Gadjah Mada University in Yogyakarta, Indonesia on 29 February 2020*.
> In this meetup, there will be a sharing session, technical session, and
> discussion about the QGIS Indonesia community itself. Below is the agenda
> that we have:
>
> *Sharing Session:*
>
>1. *The growth of open-source GIS (QGIS and Geoserver) in Indonesia*
>by Ibnu Rosyadi
>2. *Land cover mapping by using machine learning and land change by
>using cellular automata on QGIS* by Nur M. Farda
>3. *Basic GRASS in QGIS* by Firman Hadi
>4. *The uses of QGIS in the forest and environmental management* by
>Afandi Ahmad
>5. *QGIS for village mapping* by Eko Kalisno
>
> *Technical session:*
>
>1. *Bug reporting on QGIS and QGIS community's activities around the
>world* by Ismail Sunni
>2. *Translating QGIS to Bahasa Indonesia* by Adi Kurniawan
>3. *Creating graphical modeler on QGIS* by M. Iqnaul
>4. *Basic QGIS* by M. Anshori
>
> For more information (in Bahasa Indonesia) you can visit
> https://qgis-id.github.io/#meetup
>
> There are still some spots left, you can contact me if you are interested.
> We got a bigger room than initially, that can accommodate around 80 people
> (compared to 50 initially). And we are still open for sponsorship also :)
>
> I am posting this just in case there are some Indonesian (or people who
> can speak Bahasa Indonesia) in this mailing list who are not aware of *QGIS
> Indonesia* (soon to be) *User Group*. We are still a new baby (although
> already active in our Telegram group with 500 members) and trying to gather
> more and more people to join us.
>
> If you are interested, you can join us on our Telegram group (
> https://t.me/qgisindonesia), and see you there :)
>
> Thanks
>
> Best Regards
>
> --
> Ismail Sunni
> Software Engineer
> ismailsunni.id
> ismailsunni.wordpress.com
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Re: [Qgis-user] QGIS Indonesia Meetup #1

[Rizky Maulana Nugraha]

Thank you for sharing, Ismail!
Cheers from a fellow Indonesian here.
Hopefully the first meetup can raise more awareness for QGIS and OSGEO 
community in general.

Wish you all the best for the event!

Rizky Maulana Nugraha
On 27 Feb 2020 14.37 +0700, labri...@eled.auth.gr, wrote:
>
> Dear Ismail,
>
> Thank you very much for letting us know about your group and your
> activities. It is very interesting to let others know about the
> forming of groups like yours and also about your meetings.
> As Editor in Chief of GeoForAll
> (https://www.osgeo.org/initiatives/geo-for-all/) Newsletter I will
> announce your meeting in the next issue (March issue).
> I would like to invite you to have a look at the Newsletter
> (https://www.osgeo.org/initiatives/geo-for-all/geo-newsletters-archive/) which
> is devoted to the Open Source and Free geospatial software.
> I think that it would be very interesting to send me (if you think so)
> an abstract of the results of your meeting to be published in the
> Newsletter.
>
> Looking forward to getting more news from you and your group
> Nikos Lambrinos
>
>
> Παραθέτοντας από Ismail Sunni :
>
> > Dear all,
> >
> > First, please apologize me if this post may not be in suitable for this
> > mailing list and perhaps not interesting for most of the member :)
> >
> > I just want to share *the first QGIS Indonesia meet up*. It will be
> > held at *Gadjah
> > Mada University in Yogyakarta, Indonesia on 29 February 2020*. In this
> > meetup, there will be a sharing session, technical session, and discussion
> > about the QGIS Indonesia community itself. Below is the agenda that we have:
> >
> > *Sharing Session:*
> >
> > 1. *The growth of open-source GIS (QGIS and Geoserver) in Indonesia* by
> > Ibnu Rosyadi
> > 2. *Land cover mapping by using machine learning and land change by
> > using cellular automata on QGIS* by Nur M. Farda
> > 3. *Basic GRASS in QGIS* by Firman Hadi
> > 4. *The uses of QGIS in the forest and environmental management* by
> > Afandi Ahmad
> > 5. *QGIS for village mapping* by Eko Kalisno
> >
> > *Technical session:*
> >
> > 1. *Bug reporting on QGIS and QGIS community's activities around the
> > world* by Ismail Sunni
> > 2. *Translating QGIS to Bahasa Indonesia* by Adi Kurniawan
> > 3. *Creating graphical modeler on QGIS* by M. Iqnaul
> > 4. *Basic QGIS* by M. Anshori
> >
> > For more information (in Bahasa Indonesia) you can visit
> > https://qgis-id.github.io/#meetup
> >
> > There are still some spots left, you can contact me if you are interested.
> > We got a bigger room than initially, that can accommodate around 80 people
> > (compared to 50 initially). And we are still open for sponsorship also :)
> >
> > I am posting this just in case there are some Indonesian (or people who can
> > speak Bahasa Indonesia) in this mailing list who are not aware of *QGIS
> > Indonesia* (soon to be) *User Group*. We are still a new baby (although
> > already active in our Telegram group with 500 members) and trying to gather
> > more and more people to join us.
> >
> > If you are interested, you can join us on our Telegram group (
> > https://t.me/qgisindonesia), and see you there :)
> >
> > Thanks
> >
> > Best Regards
> >
> > --
> > Ismail Sunni
> > Software Engineer
> > ismailsunni.id
> > ismailsunni.wordpress.com
>
>
>
> --
> Δρ. Νίκος Λαμπρινός
> Καθηγητής της Διδασκαλίας της Γεωγραφίας
> Τμήμα Δημοτικής Εκπαίδευσης
> Α.Π.Θ. 54124 Θεσσαλονίκη
> Τηλ.: 2310 991201 / 991230
> Email: labri...@eled.auth.gr
> Web Page: http://users.auth.gr/labrinos/
> http://www.digital-earth.edu.gr/
> https://www.auth.gr/univUnits
>
> -
> Dr. Nikos Lambrinos
> Professor of Geography Teaching
> Director of the Sector of Science and New Technologies
> President of the Hellenic digital earth Centre of Excellence
> Faculty of Education
> School of Primary Education
> Dept. of Science and New Technologies
> Aristotle University of Thessaloniki
> GR-54124 Thessaloniki, Greece
> Tel: +30 2310 991201
> Email: labri...@eled.auth.gr
> Web Page: http://users.auth.gr/labrinos/
> http://www.digital-earth.edu.gr/
> https://www.auth.gr/en/univUnits
>
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Re: [Qgis-user] QGIS uninstalled after GDAL PPA install

[Fernando M. Roxo da Motta]

On Wed, 26 Feb 2020 12:33:24 +0800, Ben Hur Pintor 
wrote:


> Hi!
> 
> It looks like your machine is trying to install 3.12.

  This kind of error usually indicates that 3.12 is already
installed.  Prossibly a previous install brought in the 3.12 version as
a pre-requirement.   If that is so, a command like:

$ sudo apt autoremove

Should uninstall all dangling installed prereq.   Id those prereq are
being kept due to some other package requiring them, or some remaining
from previous Qgis install it can take a bit more effort to fix.

  Try to remove directly each of those dependencies.


  HTH

> 
> As I mentioned in the last part of my previous message, right now you
> can't install QGIS 3.12 on Ubuntu 18.04 because 3.12 needs PROJ 6.3.1
> which currently isn't available in Bionic -- via the main canonical
> repo or even with the ubuntugis-unstable PPA. Therefore, I suggest
> installing from the LTR branch and not the LR branch. When I use the
> LTR branch with ubuntugis dependencies, I get QGIS 3 10.2 no problem.
> 
> I run the same machine as you and actually faced the same problem
> when I tried to install the Latest Release (3.12) on Bionic. Try
> using the repos for the LTR (the ones with -ltr in the end). Maybe
> that will help.
> 
> Don't worry about it, we've all been there.
> 
> 
> All the best,
> Ben Hur
> 
> On Wed, Feb 26, 2020, 07:12 J. M  wrote:
> 
> > Hi Ben,
> >
> > No joy, I'm afraid. I think I did everything you recommended. I'm
> > going to run through it in case I missed something obvious:
> >
> >- I ran sudo apt remove qgis grass qgis-plugin-grass, then ran
> > sudo apt-get update
> >- The /etc/apt/sources file contains the correct info because I
> >modified it for the last installation
> >- I ran autoremove on QGIS and erased over a gigabyte of
> >dependencies (which seemed like a *lot*..)
> >- I ran sudo apt-key list to check if the ubuntugis-unstable PPA
> > was still listed as trusted, and it didn't appear
> >- I added the ubuntugis stable PPA as recommended on
> >https://trac.osgeo.org/ubuntugis/wiki/UbuntuGISRepository, with
> > sudo add-apt-repository ppa:ubuntugis/ppa, and it appeared to
> > duplicate your command sudo apt-key adv --keyserver
> > keyserver.ubuntu.com --recv-key 51F523511C7028C3. Is that possible
> > when they appear to reference two different PPA's?
> >- I ran sudo apt-get install qgis qgis-plugin-grass and received
> > the following error message, similar to before:
> >
> > The following packages have unmet dependencies.
> >  qgis : Depends: gdal-abi-2-2-3
> > Depends: libqgis-analysis3.12.0 but it is not going to be
> > installed Depends: libqgis-app3.12.0 but it is not going to be
> > installed Depends: libqgis-core3.12.0 but it is not going to be
> > installed Depends: libqgis-gui3.12.0 but it is not going to be
> > installed Depends: python3-qgis (= 1:3.12.0+28bionic) but it is not
> > going to be installed
> > Depends: qgis-providers (= 1:3.12.0+28bionic) but it is not
> > going to be installed
> >  qgis-plugin-grass : Depends: qgis-provider-grass (=
> > 1:3.12.0+28bionic) but it is not going to be installed
> >  Depends: grass740
> >  Depends: libqgis-app3.12.0 but it is not going
> > to be installed
> >  Depends: libqgis-core3.12.0 but it is not
> > going to be installed
> >  Depends: libqgis-gui3.12.0 but it is not going
> > to be installed
> >  Depends: libqgisgrass7-3.12.0 but it is not
> > going to be installed
> > E: Unable to correct problems, you have held broken packages.
> >
> > I must be missing something. Do I have to open the UI via terminal
> > (sudo nautilus) and manually remove every file which makes
> > reference to QGIS and ubuntugis-unstable? As formatting my machine
> > isn't an option there must be a simple way of completely removing
> > the program and its dependencies.. right?!
> >
> > I don't even know what Gdal is or does, because I can't even get
> > started learning QGIS because I'm finding it impossible to have a
> > version running for long enough to start with tutorials! Is it to
> > allow you to overlay raster info onto GIS projects or something? I
> > googled it but the explanation must have been written by a robot
> > (no offence intended, to robots I mean). Gdal was the reason I
> > installed the ubuntugis-unstable PPA, because Blender gave me the
> > helpful error message: Please install gdal to enable raster
> > projection support. As my crystal ball was clouded up when I read
> > that I came here to bug you guys for help!
> >
> >
> > Thanks again to everyone who has had a go at helping me. Keep those
> > ideas coming!!
> > Cheers,
> > Jimi.
> >
> > On Tue, Feb 25, 2020 at 11:39 PM J. M  wrote:
> >  
> >> Hi Ben!
> >>
> >> Thanks a lot for that, really helpful; I'll give it a go. It was
> >> actually the ubuntugis unstable PPA which caused the current
> >> problem