[QGIS-it-user] QGIS calcolatore di campi e gli array

[Totò]

Ciao a tutti,
in questo periodo ho avuto modo di approfondire il gruppo *Array* [0] del
calcolatore di campi di QGIS.
Questo gruppo ha molte funzione ma non è ancora completo, mancano alcune
funzioni utili come array_majority ed altre (funzioni che sono presenti nel
plugin ArrayPlus: spero diventi un plugin core a breve).

Usando questo gruppo ho realizzato due esempi che condivido con voi:

1.  permette di etichettare/numerare delle feature in funzione di relazioni
geometriche/spaziali; per esempio, etichettare le regioni italiane in base
alla loro superficie ( 1 alla Sicilia e via via decrescendo fino alla Valle
d'Aosta con etichetta 20) [1];
2. permette di estrarre il valore maggiormente presente in un array e quindi
di rispondere al quesito: come assegnare la categoria prevalente ad un layer
partendo da da un altro layer sovrapposto. [2]

buona lettura

saluti



[0]
http://hfcqgis.opendatasicilia.it/it/latest/gr_funzioni/arrays/index.html
[1]
http://hfcqgis.opendatasicilia.it/it/latest/esempi/numerazione_poligoni_rel_spaziale.html
[2]
http://hfcqgis.opendatasicilia.it/it/latest/esempi/assegnare_cat_prevalente.html



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Re: [Qgis-user] Create own forms in QGIS 3.4

[Andrew McAninch]

Hi Kai,
In QGIS 3.4 You can customize the attribute form widgets and appearance in the 
"Attributes Form" tab.  There isnt an "edit widget" anymore, youll just see a 
list of attributes and the widget settings on the right.  You can also build 
fully customized forms in Qt Designer and use them in QGIS.

Andrew

‐‐‐ Original Message ‐‐‐
On Wednesday, February 20, 2019 5:29 AM, Kai Behncke 
 wrote:

> Dear users,
>
> I wonder if it`s possible to create own forms in Quantum GIS 3.4?
>
> I have found a couple of documentations how it`s possible in qgis 2.x.
> In the layer-properties it seemes to be possible to switch to the fields tab 
> and a "Edit widget" is offered:
> https://docs.qgis.org/2.8/en/docs/training_manual/create_vector_data/forms.html
>
> But in Quantum GIS 3.4.4Madeira I don`t see these "Edit widget"?
> Is there a way to get it or to create own forms by an other way?
>
> Thank you very much, KaiMit freundlichen Grüßen
> Im Auftrag
>
> Kai Behncke
> Geoinformation
> Tel.: +49 5451 931-7125
>
> E-Mail: kai.behn...@ibbenbueren.de
>
> Rathaus II
> Roncallistraße 3-5
> 1. Stock, Raum 105
> 49477 Ibbenbüren___
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Re: [Qgis-user] Question: Error in Add .geojson

[Richard Duivenvoorde]

On 20/02/2019 18.42, Apoyo Carbono wrote:
> Hi everybody!
> 
> I was trying to Add a layer .geojson. It  was created with MapiGIS App.
> When, I Added  it in QGIS 3.4 and I see this error: 
> /Invalid Data Source: D:/ERROR_QGIS/Points_duda.geojson is not a valid
> or recognized data source. /
> /
> /
> And, the same error appears in the version 2.18.28 available right now
> (February 20th of 2019)  when I Added   layer .geojson.
> 
> Do you know why is the reason behind this error? Could you give me a
> solution, please?

Well, if both QGIS versions fail to load it, I would think it is as the
error tells you: not a valid geojson file.

Can you share the data? (parts of it? It is a text file, be sure to sent
both the start, and and some features).

Else does a site as http://geojson.io/ open your file?

Regards,

Richard Duivenvoorde
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[Qgis-user] Question: Error in Add .geojson

[Apoyo Carbono]

Hi everybody!

I was trying to Add a layer .geojson. It  was created with MapiGIS App.
When, I Added  it in QGIS 3.4 and I see this error:
*Invalid Data Source: D:/ERROR_QGIS/Points_duda.geojson is not a valid or
recognized data source. *

And, the same error appears in the version 2.18.28 available right now
(February 20th of 2019)  when I Added   layer .geojson.

Do you know why is the reason behind this error? Could you give me a
solution, please?

I would be very grateful with you


-- 
*Ana María Munevar Díaz *
*Ingeniera Forestal*
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Re: [QGIS-it-user] Traduzione QGIS 3

[matteo]

Stefano che ne dici, il bignamino lo scriviamo sabato durante la HF? ;)
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Re: [Qgis-user] Looking for more info on exporting to GML format using version 2.18.3

[Richard Duivenvoorde]

On 20/02/2019 16.35, Sandy Dove wrote:
> Hi
> 
> Iam currently trying to get back into QGIS. I used to be a constant user
> and bug tester in the early versions!
> 
> I need to find out how to export to GML. I thought it could be as easy
> as choosing 'Save As' menu and select the format you want, but I cant
> find this and I cant seem to find a pluggin to match this requirement.

With me it is still there (QGIS 2.18.28): right click in layer manager,
select 'Save As' and then in the dialog select Geography Markup Language
[GML]

Regards,

Richard Duivenvoorde
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[Qgis-user] Looking for more info on exporting to GML format using version 2.18.3

[Sandy Dove]

Hi

Iam currently trying to get back into QGIS. I used to be a constant user
and bug tester in the early versions!



I need to find out how to export to GML. I thought it could be as easy as
choosing 'Save As' menu and select the format you want, but I cant find
this and I cant seem to find a pluggin to match this requirement.



Would appreciate some guidance.



Regards

KZN User

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[Qgis-user] Create own forms in QGIS 3.4

[Kai Behncke]

Dear users,

I wonder if it`s possible to create own forms in Quantum GIS 3.4?

I have found a couple of documentations how it`s possible in qgis 2.x.
In the layer-properties it seemes to be possible to switch to the
fields tab and a "Edit widget" is offered:
https://docs.qgis.org/2.8/en/docs/training_manual/create_vector_data/forms.html

But in Quantum GIS 3.4.4Madeira I don`t see these "Edit widget"?
Is there a way to get it or to create own forms by an other way?

Thank you very much, Kai

Mit freundlichen Grüßen
Im Auftrag

Kai Behncke
Geoinformation
Tel.: +49 5451 931-7125

E-Mail: kai.behn...@ibbenbueren.de 

Rathaus II
Roncallistraße 3-5
1. Stock, Raum 105
49477 Ibbenbüren



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[Qgis-user] double, real, numeric - does it matter at all?

[Tobias Wendorff]

Hi there,

I'm curious, which decimal number format is a good one to store
and calculate with. When using ESRI Shapefiles, dbf's "double" had
the highest precision. In PostgreSQL world, "numeric" is incredible.
But QGIS confuses me a bit.

It doesn't use the normal precision/scale format, but length/precision. I
know of IEEE 754 and the limitation of double precision. But IEEE
754-2008 also has quadruple precision. Geopackage can handle up to
64-bit, that means double precision. JSON, PostgreSQL and others
could handle unlimited precision.

Seems like QGIS is limited to double, whatever you choose as format
and data-provider. You're limited to 18 digits after the point, of
course, only 15 of them might be correct.

Why can you create numeric fields with 32 length and 30 precision,
QGIS can't handle them? Wouldn't it be more secure to limit it to
QGIS's real limitations to make the user not think, he gets a
higher one? Sure, I've been storing high precision numbers as
strings for ages (when the full precision needs to survive storing).

Check my report [1] for some example decimals. The bug reports
in there got fixed by Nyall incredible fast - thanks for that :D

Best regards,
Tobias

Refs:
[1] https://issues.qgis.org/issues/21316

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Re: [Qgis-user] [Qgis-psc] QGIS Voting Member Ballot Results

[Luigi Pirelli]

great :)

Luigi Pirelli

**
* LinkedIn: https://www.linkedin.com/in/luigipirelli
* Stackexchange: http://gis.stackexchange.com/users/19667/luigi-pirelli
* GitHub: https://github.com/luipir
* Mastering QGIS 2nd Edition:
*
https://www.packtpub.com/big-data-and-business-intelligence/mastering-qgis-second-edition
* Hire me: http://goo.gl/BYRQKg
**


On Tue, 19 Feb 2019 at 20:42, Marco Bernasocchi  wrote:

> It is with great pleasure that I'd like to announce our latest community
> voting member Hugo Mercier.
>
> Thanks to everybody for voting and thanks already Hugo for your commitment.
>
> Here you can find the votes summaries:
>
>
> https://docs.google.com/spreadsheets/d/1ycJPCu9ylVKC9hefBx_BIi5yxrcLlYPwFCUwTvzHikI/edit?usp=sharing
>
> Cheers
>
> Marco
>
> --
> Marco Bernasocchi
>
> QGIS.org Co-chair
> http://berna.io
>
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