Re: [Qgis-user] Question on Aequilibrae

[Yury]

Done

y

On Thu, 28 May 2020 at 08:41, Pedro Camargo  wrote:

> Hi Yury,
>
> You can definitely log a feature request as an issue on
> https://github.com/AequilibraE/AequilibraE/issues
>
> and please send the question to aequilib...@googlegroups.com  (I guess
> you are part of the group)
>
> Cheers,
> Pedro
>
>
>
>
>  On Thu, 28 May 2020 15:40:29 +1000 *Yury  >* wrote 
>
> Pedro,
>
> Thank you for the answer.  Shall I send my request on github, and if yes
> under the issues heading? Or the qgis users lits
> qgis-user@lists.osgeo.org ?
>
> Regards,
>
> Yury
>
> On Thu, 28 May 2020 at 03:43, Pedro Camargo  wrote:
>
>
> Yury,
>   That is a very relevant question.  Can you send it to the user's
> list?
>
> The answer, however, is not yet.  Select link analysis requires the
> creation of a Path file, which is not yet available.
>
> Cheers,
> Pedro
>
>
>  On Wed, 27 May 2020 22:48:37 +1000 *Yury  >* wrote 
>
> Dear Pedro,
>
> I have a question in relation to the functionality of Aequilibrae.  Once a
> traffic assignment has been set, is it possible to trace back the origins
> or destinations from a given link or node?
>
> For example, as a result of the assignment, there are 100 vehicles that
> flow on Link A.  Can I determine what are the origins of those 100 vehicles
> on Link A ? Can it be mapped?
>
> This might show potential improvements to the transport network or
> services.  If say 30% of vehicles on Link A arrive from a cluster of
> origins, one might suggest investigating potential public transport route
> that will take a share of those trips.
>
> I hope you understand my question.
>
> Regards,
>
> Yury Zammit
>
>
>
>
>
>
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Re: [Qgis-user] manual classification tool?

[Alexandre Neto]

Hi Raymond,

Wouldn't the identify tool with auto open form with only the class field
widget available do that? Also, select tool with multi edit form to
classify several buildings in one go would save lots of clicks.

Alex

A quinta, 28/05/2020, 07:38, Raymond Nijssen 
escreveu:

> Does anyone know if there is a tool in QGIS to quickly classify features
> manually?
>
> I have a layer with 17,000 buildings, all need to be set to 1 of 5
> values. I'm thinking about making a (quick and dirty) plugin that:
>
> - On clicking the building shows a popup menu with the 5 choices
> - Clicking the choice would update the value and change the color (redraw)
>
> Every click less really counts here. I already set up a form widget but
> also having the location of the menu near the building polygon is way
> more efficient. (I mean, no need to cross the screen with your mouse
> cursor.)
>
> Thanks!
>
> Raymond
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Re: [Qgis-user] manual classification tool?

[Raymond Nijssen]

Hi Alex,

Thanks, that is pretty close to what I'm looking for! I didn't manage to 
only show the widget for the field I want to edit though, so I'm seeing 
the entire form. I tried to find it in the Form and Fields properties 
and I tried to use hidden fields.


Ray

On 28-05-2020 09:24, Alexandre Neto wrote:

Hi Raymond,

Wouldn't the identify tool with auto open form with only the class field 
widget available do that? Also, select tool with multi edit form to 
classify several buildings in one go would save lots of clicks.


Alex

A quinta, 28/05/2020, 07:38, Raymond Nijssen > escreveu:


Does anyone know if there is a tool in QGIS to quickly classify
features
manually?

I have a layer with 17,000 buildings, all need to be set to 1 of 5
values. I'm thinking about making a (quick and dirty) plugin that:

- On clicking the building shows a popup menu with the 5 choices
- Clicking the choice would update the value and change the color
(redraw)

Every click less really counts here. I already set up a form widget but
also having the location of the menu near the building polygon is way
more efficient. (I mean, no need to cross the screen with your mouse
cursor.)

Thanks!

Raymond
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Re: [Qgis-user] manual classification tool?

[Raymond Nijssen]

Ah, I found it! (With a little help from Richard..)

There is a widget type "Hidden" that prevents showing up on the form.

Still, if anyone knows of a way that also not needs to close the form 
with an OK, could save me 17k extra mouse clicks. Using actions maybe?


Thanks,
Raymond


On 28-05-2020 10:31, Raymond Nijssen wrote:

Hi Alex,

Thanks, that is pretty close to what I'm looking for! I didn't manage to 
only show the widget for the field I want to edit though, so I'm seeing 
the entire form. I tried to find it in the Form and Fields properties 
and I tried to use hidden fields.


Ray

On 28-05-2020 09:24, Alexandre Neto wrote:

Hi Raymond,

Wouldn't the identify tool with auto open form with only the class 
field widget available do that? Also, select tool with multi edit form 
to classify several buildings in one go would save lots of clicks.


Alex

A quinta, 28/05/2020, 07:38, Raymond Nijssen > escreveu:


    Does anyone know if there is a tool in QGIS to quickly classify
    features
    manually?

    I have a layer with 17,000 buildings, all need to be set to 1 of 5
    values. I'm thinking about making a (quick and dirty) plugin that:

    - On clicking the building shows a popup menu with the 5 choices
    - Clicking the choice would update the value and change the color
    (redraw)

    Every click less really counts here. I already set up a form 
widget but

    also having the location of the menu near the building polygon is way
    more efficient. (I mean, no need to cross the screen with your mouse
    cursor.)

    Thanks!

    Raymond
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Re: [Qgis-user] manual classification tool?

[Régis Haubourg]

Le jeu. 28 mai 2020 à 11:50, Raymond Nijssen  a
écrit :

> Ah, I found it! (With a little help from Richard..)
>
> There is a widget type "Hidden" that prevents showing up on the form.
>
> Still, if anyone knows of a way that also not needs to close the form
> with an OK, could save me 17k extra mouse clicks. Using actions maybe?
>

Hi, I would try to add a python behavior to the form that will trigger the
OK button just for you when you change the value of your edit widget. I
think this works.


>
> Thanks,
> Raymond
>
>
> On 28-05-2020 10:31, Raymond Nijssen wrote:
> > Hi Alex,
> >
> > Thanks, that is pretty close to what I'm looking for! I didn't manage to
> > only show the widget for the field I want to edit though, so I'm seeing
> > the entire form. I tried to find it in the Form and Fields properties
> > and I tried to use hidden fields.
> >
> > Ray
> >
> > On 28-05-2020 09:24, Alexandre Neto wrote:
> >> Hi Raymond,
> >>
> >> Wouldn't the identify tool with auto open form with only the class
> >> field widget available do that? Also, select tool with multi edit form
> >> to classify several buildings in one go would save lots of clicks.
> >>
> >> Alex
> >>
> >> A quinta, 28/05/2020, 07:38, Raymond Nijssen  >> > escreveu:
> >>
> >> Does anyone know if there is a tool in QGIS to quickly classify
> >> features
> >> manually?
> >>
> >> I have a layer with 17,000 buildings, all need to be set to 1 of 5
> >> values. I'm thinking about making a (quick and dirty) plugin that:
> >>
> >> - On clicking the building shows a popup menu with the 5 choices
> >> - Clicking the choice would update the value and change the color
> >> (redraw)
> >>
> >> Every click less really counts here. I already set up a form
> >> widget but
> >> also having the location of the menu near the building polygon is
> way
> >> more efficient. (I mean, no need to cross the screen with your mouse
> >> cursor.)
> >>
> >> Thanks!
> >>
> >> Raymond
> >> ___
> >> Qgis-user mailing list
> >> Qgis-user@lists.osgeo.org 
> >> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
> >> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
> >>
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Re: [Qgis-user] manual classification tool?

[Alexandre Neto]

Yup, hidden widget was what I was thinking.

A custom python form can probably provide what you want. I think you will
be able to listen to that specific field widget and close the form when it
changes

Alex

A quinta, 28/05/2020, 10:50, Raymond Nijssen 
escreveu:

> Ah, I found it! (With a little help from Richard..)
>
> There is a widget type "Hidden" that prevents showing up on the form.
>
> Still, if anyone knows of a way that also not needs to close the form
> with an OK, could save me 17k extra mouse clicks. Using actions maybe?
>
> Thanks,
> Raymond
>
>
> On 28-05-2020 10:31, Raymond Nijssen wrote:
> > Hi Alex,
> >
> > Thanks, that is pretty close to what I'm looking for! I didn't manage to
> > only show the widget for the field I want to edit though, so I'm seeing
> > the entire form. I tried to find it in the Form and Fields properties
> > and I tried to use hidden fields.
> >
> > Ray
> >
> > On 28-05-2020 09:24, Alexandre Neto wrote:
> >> Hi Raymond,
> >>
> >> Wouldn't the identify tool with auto open form with only the class
> >> field widget available do that? Also, select tool with multi edit form
> >> to classify several buildings in one go would save lots of clicks.
> >>
> >> Alex
> >>
> >> A quinta, 28/05/2020, 07:38, Raymond Nijssen  >> > escreveu:
> >>
> >> Does anyone know if there is a tool in QGIS to quickly classify
> >> features
> >> manually?
> >>
> >> I have a layer with 17,000 buildings, all need to be set to 1 of 5
> >> values. I'm thinking about making a (quick and dirty) plugin that:
> >>
> >> - On clicking the building shows a popup menu with the 5 choices
> >> - Clicking the choice would update the value and change the color
> >> (redraw)
> >>
> >> Every click less really counts here. I already set up a form
> >> widget but
> >> also having the location of the menu near the building polygon is
> way
> >> more efficient. (I mean, no need to cross the screen with your mouse
> >> cursor.)
> >>
> >> Thanks!
> >>
> >> Raymond
> >> ___
> >> Qgis-user mailing list
> >> Qgis-user@lists.osgeo.org 
> >> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
> >> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
> >>
> > ___
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Re: [Qgis-user] manual classification tool?

[Werner Macho]

Hi Raymond,

Sounds like a blogpost with a nice explanation, that is a problem I also
have sometimes (though not with 17K).
Once you solved it it would be nice to have a manual howto get there.

regards
Werner

On Thu, May 28, 2020 at 11:58 AM Alexandre Neto 
wrote:

> Yup, hidden widget was what I was thinking.
>
> A custom python form can probably provide what you want. I think you will
> be able to listen to that specific field widget and close the form when it
> changes
>
> Alex
>
> A quinta, 28/05/2020, 10:50, Raymond Nijssen 
> escreveu:
>
>> Ah, I found it! (With a little help from Richard..)
>>
>> There is a widget type "Hidden" that prevents showing up on the form.
>>
>> Still, if anyone knows of a way that also not needs to close the form
>> with an OK, could save me 17k extra mouse clicks. Using actions maybe?
>>
>> Thanks,
>> Raymond
>>
>>
>> On 28-05-2020 10:31, Raymond Nijssen wrote:
>> > Hi Alex,
>> >
>> > Thanks, that is pretty close to what I'm looking for! I didn't manage
>> to
>> > only show the widget for the field I want to edit though, so I'm seeing
>> > the entire form. I tried to find it in the Form and Fields properties
>> > and I tried to use hidden fields.
>> >
>> > Ray
>> >
>> > On 28-05-2020 09:24, Alexandre Neto wrote:
>> >> Hi Raymond,
>> >>
>> >> Wouldn't the identify tool with auto open form with only the class
>> >> field widget available do that? Also, select tool with multi edit form
>> >> to classify several buildings in one go would save lots of clicks.
>> >>
>> >> Alex
>> >>
>> >> A quinta, 28/05/2020, 07:38, Raymond Nijssen > >> > escreveu:
>> >>
>> >> Does anyone know if there is a tool in QGIS to quickly classify
>> >> features
>> >> manually?
>> >>
>> >> I have a layer with 17,000 buildings, all need to be set to 1 of 5
>> >> values. I'm thinking about making a (quick and dirty) plugin that:
>> >>
>> >> - On clicking the building shows a popup menu with the 5 choices
>> >> - Clicking the choice would update the value and change the color
>> >> (redraw)
>> >>
>> >> Every click less really counts here. I already set up a form
>> >> widget but
>> >> also having the location of the menu near the building polygon is
>> way
>> >> more efficient. (I mean, no need to cross the screen with your
>> mouse
>> >> cursor.)
>> >>
>> >> Thanks!
>> >>
>> >> Raymond
>> >> ___
>> >> Qgis-user mailing list
>> >> Qgis-user@lists.osgeo.org 
>> >> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
>> >> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
>> >>
>> > ___
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>> > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
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>
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[Qgis-user] cover and back cover using atlas in qgis3

[Poltini Roberto]

Hi all,
   How can I add a cover page at the beginning of the atlas and a back cover at 
the end of the atlas using qgis 3 ?
Thank you

Roberto Poltini


Per essere informati sulle novità del Gruppo Iren, vi invitiamo a registrarvi 
alla nostra mailing list, all’indirizzo 
"http://www.gruppoiren.it/"; .

È possibile, inoltre, avanzare nuove idee e progetti per il territorio e 
seguire quelli già attivi nei Comitati Territoriali del Gruppo Iren, 
consultando "http://www.Irencollabora.it";

You can also suggest new ideas and initiatives for the territory and view those 
already active in the Iren Group Territorial Committees 
"http://www.Irencollabora.it";

Le informazioni contenute nella presente comunicazione e i relativi allegati 
possono essere riservate e sono, comunque, destinate esclusivamente alle 
persone o alla Società sopraindicati. La diffusione, distribuzione e/o 
copiatura del documento trasmesso da parte di qualsiasi soggetto diverso dal 
destinatario è proibita, sia ai sensi dell’art. 616 c.p. , che ai sensi del 
D.Lgs. n. 196/2003. Se avete ricevuto questo messaggio per errore, vi preghiamo 
di distruggerlo e di informare immediatamente il mittente.


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Re: [Qgis-user] cover and back cover using atlas in qgis3

[Håvard Tveite]

Hi Roberto,

You can do this with QGIS Reports and "Static Layout Sections".
Reports are covered by the documentation:

https://docs.qgis.org/3.10/en/docs/user_manual/print_composer/create_reports.html

Håvard

On 28.05.2020 12:42, Poltini Roberto wrote:
> Hi all,
> 
>     How can I add a cover page at the beginning of the atlas and a back 
> cover at the end of the atlas using qgis 3 ?
> 
> Thank you
> 
> Roberto Poltini
> 
> 
> Per essere informati sulle novità del Gruppo Iren, vi invitiamo a 
> registrarvi alla nostra mailing list, all’indirizzo 
> "http://www.gruppoiren.it/";  .
> 
> È possibile, inoltre, avanzare nuove idee e progetti per il territorio e 
> seguire quelli già attivi nei Comitati Territoriali del Gruppo Iren, 
> consultando "http://www.Irencollabora.it"; 
> 
> You can also suggest new ideas and initiatives for the territory and 
> view those already active in the Iren Group Territorial Committees 
> "http://www.Irencollabora.it"; 
> 
> Le informazioni contenute nella presente comunicazione e i relativi 
> allegati possono essere riservate e sono, comunque, destinate 
> esclusivamente alle persone o alla Società sopraindicati. La diffusione, 
> distribuzione e/o copiatura del documento trasmesso da parte di 
> qualsiasi soggetto diverso dal destinatario è proibita, sia ai sensi 
> dell’art. 616 c.p. , che ai sensi del D.Lgs. n. 196/2003. Se avete 
> ricevuto questo messaggio per errore, vi preghiamo di distruggerlo e di 
> informare immediatamente il mittente.
> 
> 
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Re: [Qgis-user] manual classification tool?

[Nicolas Cadieux]

Hi,

I see many people have responded exactly to your question so I have a question 
for you. I am playing the devil’s advocate.  What are your classification?  Can 
any of this be classified any other way than manually? You could save time if 
you could preclassify building and only check the results manually?  Can size, 
shape, or colour help?  Can you use another data base like a city map or sensor 
data help?  Can you use satellite images to do some preclassification?  Have 
you thought of using AI with aerial photography? 

If not, can you build a tool that will permit you to select multiple buildings 
at a time and only enter the information once? 

Nicolas Cadieux
Ça va bien aller!

>> Le 28 mai 2020 à 02:33, Raymond Nijssen  a écrit :
> Does anyone know if there is a tool in QGIS to quickly classify features 
> manually?
> 
> I have a layer with 17,000 buildings, all need to be set to 1 of 5 values. 
> I'm thinking about making a (quick and dirty) plugin that:
> 
> - On clicking the building shows a popup menu with the 5 choices
> - Clicking the choice would update the value and change the color (redraw)
> 
> Every click less really counts here. I already set up a form widget but also 
> having the location of the menu near the building polygon is way more 
> efficient. (I mean, no need to cross the screen with your mouse cursor.)
> 
> Thanks!
> 
> Raymond
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Re: [Qgis-user] manual classification tool?

[Raymond Nijssen]

On 28-05-2020 13:30, Nicolas Cadieux wrote:

Hi,


Hi Nicolas, thanks for pointing this out!



I see many people have responded exactly to your question so I have a question 
for you. I am playing the devil’s advocate.  What are your classification?  Can 
any of this be classified any other way than manually? You could save time if 
you could preclassify building and only check the results manually?  Can size, 
shape, or colour help?  Can you use another data base like a city map or sensor 
data help?  Can you use satellite images to do some preclassification?  Have 
you thought of using AI with aerial photography?


Yes we have been thinking of automating this, but we don't think it is 
possible. We are interested in the roof construction material and in 
case of certain material, if the roof is damaged or not.


As we are not interested in overall statistics but in the actual roof 
state of houses (cause those people might get money to fix their roofs) 
we will need to manually check them all.


Satellite imagery was not detailed enough, so a (slow) drone will be 
used for mapping the area in high resolution. This will take days or 
even weeks. In my experience the colours and quality differs per flight 
(due to the weather and sun angle) making AI learning very hard.


Luckily we have many hands around and can split the task! My job is to 
make this as easy as possible, in QGIS




If not, can you build a tool that will permit you to select multiple buildings 
at a time and only enter the information once?


Yes, that was the 2nd step. It could also be some kind of tool that 
works like a highlighter. Just pick the "red" one from a list and start 
clicking all the damaged buildings. That would even mean only 1 click 
per building.


Or, more generic, an edit tool where you can choose the field and the 
value to set, and start clicking. I think I'm developing a new plugin 
idea here!!




Nicolas Cadieux
Ça va bien aller!


Le 28 mai 2020 à 02:33, Raymond Nijssen  a écrit :

Does anyone know if there is a tool in QGIS to quickly classify features 
manually?

I have a layer with 17,000 buildings, all need to be set to 1 of 5 values. I'm 
thinking about making a (quick and dirty) plugin that:

- On clicking the building shows a popup menu with the 5 choices
- Clicking the choice would update the value and change the color (redraw)

Every click less really counts here. I already set up a form widget but also 
having the location of the menu near the building polygon is way more 
efficient. (I mean, no need to cross the screen with your mouse cursor.)

Thanks!

Raymond
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Re: [Qgis-user] manual classification tool?

[chris hermansen]

All,

Assuming the buildings are polygons, what about having five point layers,
one for each class? Select a point layer, open it for editing, add points
within building polygons of that point class. When done save and close the
point layer and move on to the next. Then use the point within polygon
overlap to set the polygon values.

No need to set any attributes.

Each classifier could have their own set of five point layers to use in
their own sector.

On Thu, May 28, 2020, 04:30 Nicolas Cadieux 
wrote:

> Hi,
>
> I see many people have responded exactly to your question so I have a
> question for you. I am playing the devil’s advocate.  What are your
> classification?  Can any of this be classified any other way than manually?
> You could save time if you could preclassify building and only check the
> results manually?  Can size, shape, or colour help?  Can you use another
> data base like a city map or sensor data help?  Can you use satellite
> images to do some preclassification?  Have you thought of using AI with
> aerial photography?
>
> If not, can you build a tool that will permit you to select multiple
> buildings at a time and only enter the information once?
>
> Nicolas Cadieux
> Ça va bien aller!
>
> >> Le 28 mai 2020 à 02:33, Raymond Nijssen  a
> écrit :
> > Does anyone know if there is a tool in QGIS to quickly classify
> features manually?
> >
> > I have a layer with 17,000 buildings, all need to be set to 1 of 5
> values. I'm thinking about making a (quick and dirty) plugin that:
> >
> > - On clicking the building shows a popup menu with the 5 choices
> > - Clicking the choice would update the value and change the color
> (redraw)
> >
> > Every click less really counts here. I already set up a form widget but
> also having the location of the menu near the building polygon is way more
> efficient. (I mean, no need to cross the screen with your mouse cursor.)
> >
> > Thanks!
> >
> > Raymond
> > ___
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[Qgis-user] query of a layer from another layer in select by expression

[Patrick St-Hilaire]

Hi !

Could someone tell me how to query a layer from fields of another layer
using select by expression? I have already created a relationship between
my two layers in projects.

Thank you

Patrick
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[Qgis-user] Unable to save project to PostgreSQL

[Cliff Patterson]

Hi QGISers!

I am unable to save a project to PostgreSQL in QGIS version 3.10.4-A
Coruña. "Allow saving/loading projects..." is enabled for this DB. The user
is the db owner and I can insert into the table using PGAdmin with the same
creds. However, when I try to save a project to the DB in QGIS, I get the
following error:

"Unable to save project to storage [db info removed]


Unable to insert or update project (project=test) in the destination table
on the database. Maybe this is due to table permissions (user=mapleton).
Please contact your database admin."

Note that the qgis_projects table is created successfully in the DB before
error. Also note that other tables in the DB are editable in QGIS without
error.

Error Message in QGIS for PostGIS:

2020-05-28T12:50:37 WARNINGErroneous query: INSERT INTO
"maps".qgis_projects VALUES ('test', ('{ "last_modified_time": "' || (now()
at time zone 'utc')::text || '", "last_modified_user": "' || current_user
|| '" }')::jsonb,
E'\\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

Re: [Qgis-user] query of a layer from another layer in select by expression

[Yann Voté]

Hi,

You can try the direct but implicit represent_value() function, if the 
filtering is by the referenced column, like this:


represent_value("referencing_field") = 'filter_value_on_referenced_layer'

Or you can try the more verbose and more explicit 
attribute()/get_feature() functions, if you want to filter by another 
column:


attribute(get_feature('referenced_layer_name', 'referenced_field', 
"referencing_field"), 'filter_field') = 'filter_value'


And be careful about quotes: 'foo' (single quotes) is a string (but may 
designates a field in other layer in some functiones), while "foo" 
(double quotes) designates a field in the active layer.


Hope this helps!

Yann

Le 28/05/2020 à 19:11, Patrick St-Hilaire a écrit :

Hi !

Could someone tell me how to query a layer from fields of another layer 
using select by expression? I have already created a relationship 
between my two layers in projects.


Thank you

Patrick

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Re: [Qgis-user] Unable to save project to PostgreSQL

[Jorge Gustavo Rocha]

Hi Cliff,

Thank you for including the failing database insert/update. I think you
found a bug.

When QGIS writes the project to the provider, it encodes the project as
a huge hexadecimal string. But your project's hex string is not valid. I
don't know why, but it should not be invalid.

Please create a new bug report [1]. Include this insert statement (with
the invalid hexadecimal encoding) and the qgs project saved in the file
system (if the project does not contain private information).

Matthias Kuhn improved this encoding eighth mouths ago, but you might
have some "strange" characters in the project that might not be suitable
to convert with QString::fromLatin1. That's why it is important (if
possible), that you also include the original project.

This is just a guess from the insert statement (I've tried to run it),
so I added Matthias in CC, so he can correct me, if I'm wrong.

Best regards,

Jorge Gustavo

On 28/05/20 18:26, Cliff Patterson wrote:
> Hi QGISers!
>
> I am unable to save a project to PostgreSQL in QGIS version 3.10.4-A
> Coruña. "Allow saving/loading projects..." is enabled for this DB. The
> user is the db owner and I can insert into the table using PGAdmin
> with the same creds. However, when I try to save a project to the DB
> in QGIS, I get the following error: 
>
> "Unable to save project to storage [db info removed]
>
> Unable to insert or update project (project=test) in the destination
> table on the database. Maybe this is due to table permissions
> (user=mapleton). Please contact your database admin."
>
>
> Note that the qgis_projects table is created successfully in the DB
> before error. Also note that other tables in the DB are editable in
> QGIS without error.  
>
> Error Message in QGIS for PostGIS:
>
> 2020-05-28T12:50:37     WARNING    Erroneous query: INSERT INTO
> "maps".qgis_projects VALUES ('test', ('{ "last_modified_time": "' ||
> (now() at time zone 'utc')::text || '", "last_modified_user": "' ||
> current_user || '" }')::jsonb,
> E'\\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

Re: [Qgis-user] wishing for accurate lattitude/longitude from, a cell phone

[Priv.-Doz. Dr. Maria Shinoto]

Hi Jochen,

these are really helpful advices, thank you. I will definitely try the cheapest 
check with the aluminium foil as soon as I can go to the area ;-), but the base 
station - rover or separate antenna solution seems to become a solution that 
needs a bit of testing, will have to apply for the money first. 

As for the total station, yes, we are starting from a ground point and create 
low level ground points walking up the valleys at the moment; but we have to 
consider measurement errors increasing. 

Thanks again, I think I got a lot of really useful input, 
Maria


> Am 28.05.2020 um 14:25 schrieb j.hu...@post-ist-da.de:
> 
> Hi Maria,
> 
> the position of the base station at the entrance of the valley sounds
> good. Before you invest a lot of money, you could rent a system and try
> it out in the field. Most local dealers should have devices available
> for rent or tests.
> 
> The problem with wet conditions could have to do with multipathing
> effects. Probably a choke ring antenna will be better in these
> conditions. You could try an experiment: Put your GPS in a flat box
> which is covered with some conductive material (eg aluminium foil) so
> that it only "sees" signals from above (the visible sky), not from below
> or the lower sides. See if this changes the resulting accuracy.
> 
> Using a GPS antenna mounted on a pole has the advantage that your body
> does not obstruct parts of the visible sky. When measuring near a steep
> slope, be sure to stand on the side of the slope where the GPS can't
> "see" the sky anyway. I know surveyors who use very long poles (like
> 3-4m) to position the antenna above the lower layer of vegetation. You
> get errors due to the lack of verticality but much better reception.
> 
> You can't expect to get cm accuracy in the conditions you describe, at
> least not with short-time measurements. For this you need phase tracking
> which is very sensitive even to short obstructions of a satellite signal
> (canopy).
> 
> Unfortunately it sound like you don't have sight contact on ground level
> either, so a GPS base station as a reference and a total station for
> measuring the individual points won't be an option.
> 
> Regards
> Jochen
> 
> 
> 
> Am 28.05.20 um 01:53 schrieb Priv.-Doz. Dr. Maria Shinoto:
>> Hi fellow archaeologists ;-), 
>> 
>> there is so much precious information in this thread. 
>> 
>> Now one question about precision and accuracy: As I said, we work in a 
>> densely forested area, there is not just the canopy of the trees, but two to 
>> three levels below with dense ground cover and bamboo walls. Still, we get 
>> excellent (precise) results with consumer level handhelds and smartphones. 
>> But the accuracy is not good under certain conditions: Water and muddy 
>> ground seems to be an obstacle for GPS as well as the steep slopes. We get 
>> very precise results in certain places, but they are in certain cases 
>> several meters apart from the "real" place -- which we can test with the 
>> LiDAR DTM. Dry underground and measurement about 10m apart from the slopes 
>> result in accurate positions, but any measurement point closer to the slopes 
>> leads to a consistent error in the measurement -- across devices. 
>> 
>> I still wonder whether these conditions are suitable for any GPS technology 
>> or whether working with a fixed station and a rover would be OK. I could 
>> then think of positioning the station at the entrance of the valley and 
>> walking up narrowing valley with the rover.
>> 
>> Best, 
>> Maria
>> 
>> 
>>> Am 28.05.2020 um 02:17 schrieb Nicolas Cadieux 
>>> :
>>> 
>>> Hi Garth,
>>> 
>>> I am also an archaeologist.  We use a single Sxblue 2 from GENEQ.  The unit 
>>> was upgraded by the company so it’s takes in the Russian constellation now. 
>>>  The unit is very precise. When we go out on the field, we let le unit run 
>>> one a Bench mark for a few hours.  We then process that position  In PPP or 
>>> using nrcan gps tower if we are close to one.  The company give a really 
>>> good service helping with both software support and hardware.  As 
>>> everything in made and designed in Québec, they can take the unit appart 
>>> and change individual parts and chips.  We did that one as the Bluetooth 
>>> chip was now longer capable of working with Windows 10 (more likely the 
>>> other way around). It had been Made for Windows 95.  For a few extra bucks, 
>>> they changed the gps chip also.  The unit is basically a brick (Square and 
>>> heavy) that connects to an external device like a laptop or a tablet.  No 
>>> screens or anywhere fancy.
>>> 
>>> https://geneq.com/land-surveying-geomatics/fr/fabricant/sxblue
>>> 
>>> Nicolas Cadieux
>>> Ça va bien aller!
>>> 
 Le 27 mai 2020 à 11:19, QGIS.USER  a écrit :
 
 Hi Garth,
   Thank you for the correction and the additional information. Much 
 appreciated.
 
 My current thinking is that in the archaeology we do, the intra-site 
 (relative) measu

[Qgis-user] Connecting to WMS does not work

[Christoph Jung]

Hello everyone,

I have a very strange problem with QGIS. Only one user in my company is not 
able to connect a external WMS. If we try to connect via the data source 
manager, a dialog appears with the information, that the host cannot be found. 
The url of the service is not the problem because it is inserted via a plugin, 
i.e. all users using the same url. And for all other users it works perfectly. 
We copied the url from QGIS into the browser and we can get the capabilities. 
The same url works without problems in other software (Smallworld, GSA, 
WindPro). The proxy in QGIS is correct. If I remove the proxy settings we get 
another error message according to the proxy. The parameters for the proxy are 
the same for all users and also inserted via a plugin to avoid typing errors or 
something. It is not a problem of a different IP segment or something because 
only QGIS has this problem and we are not able to reproduce it with other 
users. 

Now the (for me very important ^^) question: does anybody had such a problem in 
the past or could imagine other possibilities of problems?

Sincerely,
Christoph 
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Re: [Qgis-user] Connecting to WMS does not work

[Alessandro Pasotti]

On Fri, May 29, 2020 at 6:59 AM Christoph Jung  wrote:
>
> Hello everyone,
>
> I have a very strange problem with QGIS. Only one user in my company is not 
> able to connect a external WMS. If we try to connect via the data source 
> manager, a dialog appears with the information, that the host cannot be 
> found. The url of the service is not the problem because it is inserted via a 
> plugin, i.e. all users using the same url. And for all other users it works 
> perfectly. We copied the url from QGIS into the browser and we can get the 
> capabilities. The same url works without problems in other software 
> (Smallworld, GSA, WindPro). The proxy in QGIS is correct. If I remove the 
> proxy settings we get another error message according to the proxy. The 
> parameters for the proxy are the same for all users and also inserted via a 
> plugin to avoid typing errors or something. It is not a problem of a 
> different IP segment or something because only QGIS has this problem and we 
> are not able to reproduce it with other users.
>
> Now the (for me very important ^^) question: does anybody had such a problem 
> in the past or could imagine other possibilities of problems?
>

It's unlikely, but there is only one thing I can think of: if the
user's QGIS uses a different QT version then his colleagues he might
be hitting this bug: https://bugreports.qt.io/browse/QTBUG-76821

Regards.

-- 
Alessandro Pasotti
QCooperative:  www.qcooperative.net
ItOpen:   www.itopen.it
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