Re: [QGIS-it-user] Dubbio trasformazioni EPSG con GDAL 3.0.14 e PROJ 6.3.1

[Luca Bellani]

Aggiornamento: nuovo profilo pulito, nessun plug.
Setto le proprietá di progetto per essere sempre in EPSG 4326.
Carico un layer del IDE Messicano, con EPSG 6372, itrf2008, il sistema
ufficiale.
Compare la finestra di trasformazioni (che nelle versioni precedenti di QGIS
non c'éra), e mi da 2 opzioni. 

Peró, una volta ancora, non c'é congruenza tra la mini mappa, e la casella
che riporta "Area of use"... e non so chi stia facendo l'errore..la mini
mappa? il testo? o io?

 



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[QGIS-it-user] Dubbio trasformazioni EPSG con GDAL 3.0.14 e PROJ 6.3.1

[Luca Bellani]

Salve, ho provato un profilo pultyio di QGIS 3.12.1.
Ho installato solo DataPloty e caricato un layer vettoriale.
All'aprirsi, esce la finestra dlle trasformazioni, ma non capisco chew
succeda...
il layer in questione sono gli stati di USA, con EPSG 4269. e il progetto di
default cerca di mettersi in 4326.
Ora, nella finestra, non so cosa selezionare (ho paura di sbagliare e
falsificare poi tutti i calcoli). 
Lo dico perché la prima opzione che mi presenta apparentemente sembra quella
giusta, ma la mappa generale indica tutt¿altro continente... Africa, e
qualsiasi sistema di trasformazione io selezioni, la finestra della mappa
segnala sempre Sud Africa...

avete qualche consiglio? Sará semplicemente un errore di visualizzazione
della mini mappa?
Ciao e grazie

 



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[Qgis-user] Geometry errors while polygonizing raster data

[Atharva Raykar]

Hello,

I have been trying to convert this raster data using QGIS's Polygonize
function: https://daac.ornl.gov/VEGETATION/guides/Decadal_LULC_India.html

The converted geopackage is returning many geometries with negative areas.
So much so that the data is highly inaccurate, and some categories are
having negative areas with x^10 sq. meters in magnitude.

The features basically resemble the ones I found in this stack overflow
answer: https://gis.stackexchange.com/a/243707/161470 , where the holes are
located outside the geometry and are larger than the geometry itself.

How do I troubleshoot this? Is this a bug with QGIS?

I'm using QGIS 3.14 LTS.
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[Qgis-user] Pavement defects Identification

[krishna Ayyala]

Hello,
Is it possible to identify the pavement defects using a raster image with
QGIS?  If there is any tutorial about this, can you please direct me the
tutorial.

Regards.
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Re: [Qgis-user] QGIS Server and webmapping information

[Etienne Trimaille]

Thanks, I'll check it out. I haven't checked too much the WFS3 yet.

Le ven. 10 avr. 2020 à 15:14, Alessandro Pasotti  a
écrit :

> On Fri, Apr 10, 2020 at 3:05 PM Etienne Trimaille
>  wrote:
> >
> > Hi,
> >
> > qgis2web will generate a static website that you can easily move on a
> server somewhere, without the need to install QGIS Server.
> > The website will be generated from the plugin itself.
> >
> > If you install QGIS Server only, you will have only some OGC streams
> such as WMS, WFS etc. It's just to publish "data" on the internet. But you
> won't have the web viewer in an internet browser.
> > Then you need to code the web application using Leaflet or OpenLayers.
>
> That's not entirely correct anymore because WFS3 provides a very
> simple browsable website, see
>
> https://docs.qgis.org/3.10/en/docs/user_manual/working_with_ogc/server/services.html#wfs3-ogc-api-features
>
> You could easily override the default HTML templates to show your WMS
> layers too, no need to rebuild or compile anything.
>
> Cheers
>
>
>
>
> --
> Alessandro Pasotti
> w3:   www.itopen.it
>
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Re: [Qgis-user] QGIS Server and webmapping information

[Alessandro Pasotti]

On Fri, Apr 10, 2020 at 3:05 PM Etienne Trimaille
 wrote:
>
> Hi,
>
> qgis2web will generate a static website that you can easily move on a server 
> somewhere, without the need to install QGIS Server.
> The website will be generated from the plugin itself.
>
> If you install QGIS Server only, you will have only some OGC streams such as 
> WMS, WFS etc. It's just to publish "data" on the internet. But you won't have 
> the web viewer in an internet browser.
> Then you need to code the web application using Leaflet or OpenLayers.

That's not entirely correct anymore because WFS3 provides a very
simple browsable website, see
https://docs.qgis.org/3.10/en/docs/user_manual/working_with_ogc/server/services.html#wfs3-ogc-api-features

You could easily override the default HTML templates to show your WMS
layers too, no need to rebuild or compile anything.

Cheers




--
Alessandro Pasotti
w3:   www.itopen.it
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Re: [Qgis-user] QGIS Server and webmapping information

[Etienne Trimaille]

Hi,

qgis2web will generate a static website that you can easily move on a
server somewhere, without the need to install QGIS Server.
The website will be generated from the plugin itself.

If you install QGIS Server only, you will have only some OGC streams such
as WMS, WFS etc. It's just to publish "data" on the internet. But you won't
have the web viewer in an internet browser.
Then you need to code the web application using Leaflet or OpenLayers.

If you use QGIS Web Client, Lizmap or similar, the web application is
already there and will offer some widgets and some tools. It will try to
mimic the QGIS Desktop application with the layer tree, the print layouts,
dataviz etc.

I tried to make this schema :
https://docs.lizmap.com/next/en/introduction.html I hope it can help you.

There are a few QGIS web applications : QGIS Web Client, Lizmap, GisQuick,
Mappia

Le ven. 10 avr. 2020 à 14:04, Franko Naimarevic 
a écrit :

> Hello,
>
> I'm a final-year architecture student, and as part of my thesis, I'm
> researching on how to publish a map made in QGIS on the internet, in
> hopes of doing so later myself.
> I've heard that the qgis2web plugin was a great option, but I've also
> found that it was possible to do with QGIS Server. However, I haven't
> managed to find a lot of "theoretical" explanations about it, plus, I'm
> really not that familiar with this webmapping/GIS "world". So, I was
> hoping someone could clarify things for me, as completely as possible.
>
> I understand the main step is to install it on a server, obviously. But
> what are the other things that have to be done in order to publish an
> interactive QGIS map on the internet?
>
> For example, I'm wondering at what point are the widgets (for
> navigation, search bar, ...) defined to appear on the webpage?
>
> Also, QGIS Server and QGIS Web Client seem to work together ; what is
> their role in that relationship? Is it a necessity?
>
>
> Thanks in advance for your help,
>
> Franko
>
>
>
>
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[Qgis-user] QGIS Server and webmapping information

[Franko Naimarevic]

Hello,

I'm a final-year architecture student, and as part of my thesis, I'm 
researching on how to publish a map made in QGIS on the internet, in 
hopes of doing so later myself.
I've heard that the qgis2web plugin was a great option, but I've also 
found that it was possible to do with QGIS Server. However, I haven't 
managed to find a lot of "theoretical" explanations about it, plus, I'm 
really not that familiar with this webmapping/GIS "world". So, I was 
hoping someone could clarify things for me, as completely as possible.


I understand the main step is to install it on a server, obviously. But 
what are the other things that have to be done in order to publish an 
interactive QGIS map on the internet?


For example, I'm wondering at what point are the widgets (for 
navigation, search bar, ...) defined to appear on the webpage?


Also, QGIS Server and QGIS Web Client seem to work together ; what is 
their role in that relationship? Is it a necessity?



Thanks in advance for your help,

Franko




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Re: [Qgis-user] ISSUE QGIS keeps freezing - QGIS Desktop 3.10.4

[Bo Victor Thomsen]

Hi Koos -

From your description I suspect you had a memory issue, i.e running out 
of memory. It might be caused by QGIS but it's probably caused by  some 
other app running on your computer. Some (badly implemented) apps are 
"leaking" memory, i.e: allocating memory, but never deallocating it 
after use. After some time the bad app has allocated large amounts of 
memory that's not available to other apps.


If you are short on available memory on the computer the OS will begin 
to swap contents from the memory to and from a swap-file usually placed 
in the root of C: (the hard-disk containing the OS).  This can explain 
the sudden periodic "freezing" of QGIS: The OS has to load pieces of 
out-swapped QGIS content into memory before QGIS can continue.


If you additionally are short on available disk space on the system 
drive and are creating some largish temp files (which usually is placed 
on the system drive), the situation can rapidly escalate to a system 
crash (BSOD)


To avoid this situation:

 * Install more memory on your computer.
 * Only have a minimum of apps running at the same time.
 * Frequently reboot you computer (It's Windows, after all :-)
 * If you have two hard-disks on your computer: Move the temp directory
   to different drive than the one containing the swap-file.

You already done the "right now"- steps anyway so the mail is more a 
reminder for other readers or google-searches :-)


And by the way: QGIS and Postgres/PostGIS is a killer combination :-) . 
IMHO it beats other GIS applications hands down.


--
Med venlig hilsen / Kind regards

Bo Victor Thomsen


Den 10-04-2020 kl. 08:55 skrev Koos Fransen:


Dear Bo and Andreas

Thank you very much for your insights.

Given the fact that QGIS has been more stable since yesterday, I think 
the problem was related to my hard drive memory and temporary files. I 
did not have a lot of space left on the hard drive, and I tend do 
leave my computer on when calling it a day, so maybe that combination 
was not very helpful for QGIS to work smoothly.


I’ve deleted some data on my laptop, thus freeing up some space and, 
as you said, I deleted my temp files for QGIS (I had been working with 
very large datasets), and for now everything works quite well. I’ll 
also start shutting off my laptop from time to time 


I’ll keep you posted if it should occur again and if I can find a 
clear solution to the problem. Anyway, Bo, you and your wife’s list is 
a very good starting point to start problem solving with should this 
issue occur again. There are some things that I can exclude as reason 
(build is the stable 3.10 version, it’s not the anti-virus, it’s not a 
work network environment, …), and some things that I still have to 
test. Many thanks for your help (and good luck with the teaching 
assignment, I’m teaching introductory courses in GIS at Vrije 
Universiteit Brussel, but one of the next things I would like to dive 
into is the use of PostGIS and PostgreSQL for my own research)!


Kind regards

Koos

--
*dr. Koos Fransen*

Research unit Cosmopolis (VUB)

Research unit ISE (UGent)**

I am available for _VUB_ on _Tuesdays, Thursdays and Fridays_ and for 
UGent on Mondays and Wednesdays. Consequently, I try to structure 
meetings accordingly and answers to your mails may be delayed.


*From:*Andreas Neumann 
*Sent:* donderdag 9 april 2020 17:27
*To:* Bo Victor Thomsen ; Koos Fransen 
; qgis-user@lists.osgeo.org

*Subject:* Re: [Qgis-user] ISSUE QGIS keeps freezing - QGIS Desktop 3.10.4

Hi,

These are all good points. I also had severe issues with Antivirus - 
it slowed down or prevented a lot of the network access. The IT 
services had to add exceptions.


But you describe that it only happens after a couple of days of usage, 
which is strange.


If you find out what the issues really is, please let us know, so we 
can learn.


Andreas

Am 09.04.20 um 15:20 schrieb Bo Victor Thomsen:

Hi Koos -

I had a talk with my wife Lene Fischer about your issues. (She is
a Assoc. Prof. teaching GIS at a department of the University of
Copenhagen using QGIS. I co-lecture with her on the use of spatial
enabled databases (PostgreSQL/ PostGIS)).

She hasn't experienced the issues you describe (but some other
issues)

Here is some pointers:

  * Use a long-term releases and keep up with the point releases
3.10.3 -> 3.10.4 (Which you do :-)
  * Clean the temp dir regularly (Which you did :-)
  * Check the setup of your windows pointers to user-dirs, temp
space. Sometimes they are not suited for computers outside the
university network (or inside, if the network sucks)
  * Check if your logon name contains special characters outside
us-ASCII like accented character or blanks. QGIS is fine with
these but some add-on libraries is not. The logon name can be
a part of a path name that something chokes on.
  * Check your antivirus by temporarily disable it 

[QGIS-it-user] Problema inserimento testo da remoto

[cxc]

Buongiorno ho un problema strano  sto lavorando da Mac su un pc remoto in 
rete aziendale con win7
ieri ho lavorato tranquillamente su qgis (3.10.3) 
stamani ho avuto l'idea di verificare gli aggiornamenti (OSGeo4W) ed 
effettivamente mi ha aggiornato alla 3.10.4
ho lanciato come di solito la desktop con grass e... non riesco a scrivere. 
Ho provato anche con la versione desktop e si ripropone il problema
Ossia premendo la prima lettera del nickname la ripete. 
Ora ho chiesto agli amministratori della rete magari fosse da riavviare il pc 
remoto.
Stessa cosa accade se provo ad usare Telegram .. mentre aprendo un blocco note 
(su cui ho scritto nickname e pass)
Scrive normalmente

Qualcuno ha idea di cosa possa essere successo?
Grazie
Saluti
Carlo A.


> Il giorno 09 apr 2020, alle ore 21:00, qgis-it-user-requ...@lists.osgeo.org 
> ha scritto:
> 
> qgis-it-user@lists.osgeo.org 
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Re: [Qgis-user] ISSUE QGIS keeps freezing - QGIS Desktop 3.10.4

[Koos Fransen]

Dear Bo and Andreas

Thank you very much for your insights.
Given the fact that QGIS has been more stable since yesterday, I think the 
problem was related to my hard drive memory and temporary files. I did not have 
a lot of space left on the hard drive, and I tend do leave my computer on when 
calling it a day, so maybe that combination was not very helpful for QGIS to 
work smoothly.
I’ve deleted some data on my laptop, thus freeing up some space and, as you 
said, I deleted my temp files for QGIS (I had been working with very large 
datasets), and for now everything works quite well. I’ll also start shutting 
off my laptop from time to time 
I’ll keep you posted if it should occur again and if I can find a clear 
solution to the problem. Anyway, Bo, you and your wife’s list is a very good 
starting point to start problem solving with should this issue occur again. 
There are some things that I can exclude as reason (build is the stable 3.10 
version, it’s not the anti-virus, it’s not a work network environment, …), and 
some things that I still have to test. Many thanks for your help (and good luck 
with the teaching assignment, I’m teaching introductory courses in GIS at Vrije 
Universiteit Brussel, but one of the next things I would like to dive into is 
the use of PostGIS and PostgreSQL for my own research)!

Kind regards
Koos

--
dr. Koos Fransen
Research unit Cosmopolis (VUB)
Research unit ISE (UGent)

I am available for VUB on Tuesdays, Thursdays and Fridays and for UGent on 
Mondays and Wednesdays. Consequently, I try to structure meetings accordingly 
and answers to your mails may be delayed.

From: Andreas Neumann 
Sent: donderdag 9 april 2020 17:27
To: Bo Victor Thomsen ; Koos Fransen 
; qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] ISSUE QGIS keeps freezing - QGIS Desktop 3.10.4


Hi,

These are all good points. I also had severe issues with Antivirus - it slowed 
down or prevented a lot of the network access. The IT services had to add 
exceptions.

But you describe that it only happens after a couple of days of usage, which is 
strange.

If you find out what the issues really is, please let us know, so we can learn.

Andreas
Am 09.04.20 um 15:20 schrieb Bo Victor Thomsen:

Hi Koos -

I had a talk with my wife Lene Fischer about your issues. (She is a Assoc. 
Prof. teaching GIS at a department of the University of Copenhagen using QGIS. 
I co-lecture with her on the use of spatial enabled databases (PostgreSQL/ 
PostGIS)).

She hasn't experienced the issues you describe (but some other issues)

Here is some pointers:

  *   Use a long-term releases and keep up with the point releases 3.10.3 -> 
3.10.4 (Which you do :-)
  *   Clean the temp dir regularly (Which you did :-)
  *   Check the setup of your windows pointers to user-dirs, temp space. 
Sometimes they are not suited for computers outside the university network (or 
inside, if the network sucks)
  *   Check if your logon name contains special characters outside us-ASCII 
like accented character or blanks. QGIS is fine with these but some add-on 
libraries is not. The logon name can be a part of a path name that something 
chokes on.
  *   Check your antivirus by temporarily disable it before using QGIS.
  *   Check your disk space. The temp dir  can "grow" considerably during QGIS 
use.
  *   Check the amount of memory used on your computer.  If you are using all 
available ram you will get the symptoms you describe
  *   Install a minimum of plugins.
  *   Keep your windows installation as clean as possible. QGIS might conflict 
with some other software installed on your computer. You might try to install 
QGIS on computer with a new clean install of windows. Check if the error is 
repeated on the new computer.
  *   You might try with installing QGIS from the "network installer" utility 
instead of a stand-alone installation 
(https://download.osgeo.org/osgeo4w/osgeo4w-setup-x86_64.exe). It defaults to 
another installation directory than the stand-alone installation. That might 
help.
  *   If nothing of the above works - try another version of QGIS i.e. 3.12.1.
The network installer  has the possibility to install a "bleeding edge" version 
of QGIS but I won't recommend using these in a teaching situation (or any other 
situation which involves inexperienced users). But you can use it in a testing 
situation

--

Med venlig hilsen / Kind regards



Bo Victor Thomsen




Den 09-04-2020 kl. 11:20 skrev Koos Fransen:
Hi Bo

Thanks for your quick response!
Sorry for the minimal information provided, I wasn’t sure what to add (first 
question to the QGIS user list).

To answer your questions:
OS: Windows 10 – 64 bit
QGIS version: 3.10.4 64 bit, stand-alone installation

I’m not in any networked set-up, I’m working from home on my own computer. I 
have only one plugin installed (QuickOSM), and I’ve already tried uninstalling, 
but without any difference.
Since my question I’ve been trying some things, and I have deleted the