Re: [Qgis-user] Support - representing a graph in Qgis

[Nicolas Cadieux]

Hi,

You could consider https://networkx.org/ if you are really looking for 
just a graph. It's a pure Python library but it's not included with 
QGIS.  It's not too difficult to learn but geared towards analysis and 
not visualization like Graphviz. (I have never user Graphviz so don't 
take my word for it.)


You can still do what you want in QGIS.  Shapefile lines could 
simplified by changing the geometry into a simple line between the first 
and last node.  Qgis has the advantage (and disadvantage if the network 
is complicated) of giving you complete control on were you position 
nodes on a map.  Graph libraries usually give you a choice of rendering 
styles but it gets complicated if you want complete control on the 
rendering.   You could also use  QGIS to draw the shapefile and export 
those to Graphviz for visualization.  You could also look at Cytoscape 
and Gephi that seem to be vizualisation software for graphs.


https://gephi.org/

https://cytoscape.org/

Nicolas

On 2021-02-10 11:39 a.m., chris hermansen wrote:

Giacomo and list,

On Wed, Feb 10, 2021 at 4:05 AM Giacomo Uguccioni 
mailto:giacomo.ugucci...@gmail.com>> wrote:


Thanks a lot!
I would like to represent a shapefile or more shapefiles of nodes
and connections (lines and points)
in a layout similar to an electrical scheme, a symbolic and
conceptual scheme and not a geographical one.
I attached an image with qgis view and output that I would like to
get.


In your graph representation (version to the right in your sketch) how 
do you determine that A is the start node? (and not 3 or 4?)


This kind of diagram is what Graphviz is built to represent.  You will 
need to convert your shapefiles to a Graphviz input program.  A 
reasonable starting approach might be to use some vector operations to 
get attribute tables that look like [from-node,to-node] along with the 
node attributes.  I suggest you study the Graphviz documentation, 
which is quite excellent and full of worked examples, to see how to 
draw the sketch you presented here, and then revisit your shapefiles 
to think about how to convert them to that format.



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C'est ma façon de parler.

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Re: [Qgis-user] Support - representing a graph in Qgis

[chris hermansen]

Giacomo and list,

On Wed, Feb 10, 2021 at 4:05 AM Giacomo Uguccioni <
giacomo.ugucci...@gmail.com> wrote:

> Thanks a lot!
> I would like to represent a shapefile or more shapefiles of nodes and
> connections (lines and points)
> in a layout similar to an electrical scheme, a symbolic and conceptual
> scheme and not a geographical one.
> I attached an image with qgis view and output that I would like to get.
>
>
In your graph representation (version to the right in your sketch) how do
you determine that A is the start node?  (and not 3 or 4?)

This kind of diagram is what Graphviz is built to represent.  You will need
to convert your shapefiles to a Graphviz input program.  A reasonable
starting approach might be to use some vector operations to get attribute
tables that look like [from-node,to-node] along with the node attributes.
I suggest you study the Graphviz documentation, which is quite excellent
and full of worked examples, to see how to draw the sketch you presented
here, and then revisit your shapefiles to think about how to convert them
to that format.


-- 
Chris Hermansen · clhermansen "at" gmail "dot" com

C'est ma façon de parler.
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[Qgis-user] QGIS processing command line

[Karl Magnus Jönsson]

Hi all!
I'm trying the new, relatively, features of the processing toolbox, using the 
graphical modeler and to run the model from command line. Most works fine but 
there are some things that I can't get working. Either I don't know how to 
configure it properly, or it is a bug or feature request. The documentation is 
quite short on this subject and I haven't found any more good examples. My test 
model reads two vector feature sources, buffer one of the, clip them against 
each other, write a shapefile, export to PostgreSQL as well, run some SQL and 
saves a log to a file. This works fine in graphical mode. In command line I 
have a few problems:

· Works fine with shape files but how to read directly from a database 
table? In graphical mode I can browse for a table and use it like 
'postgres://dbname=\'geodata\' host=sbkgeodata port=5432 user=\'user\' 
password=\'pwd\' sslmode=disable key=\'UNIK\' estimatedmetadata=true srid=3008 
type=PolygonZ checkPrimaryKeyUnicity=\'1\' table=\"pri\".\"byggnad_\" (geom)' 
but I don't know how to write it as a parameter in command line.

· The log file is created but it is empty from command line.

· Is there an option to use an existing table in the database and 
truncate it instead of dropping and recreate? Thought there would be. This is 
not connected to command line.

Is there someone else that have been testing features like this or are there 
any good examples to view? Maybe write bug report/feature requests/enhancement 
proposals to describe and discuss if isn't  just me using it the wrong way. I'm 
on Windows 10 with QGIS 3.16.3 Standalone installer.

Karl-Magnus Jönsson


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Re: [Qgis-user] Bug report on Qgis

[Nicolas Cadieux]

Hi,
Please file a bug report 
https://www.qgis.org/en/site/getinvolved/development/bugreporting.html

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 9 févr. 2021 à 18:14, elio augusto sagastume leal  a 
> écrit :
> 
> 
> About the Qgis program, when i'm trying to save my geopackage, suddenly the 
> program trows a window of an error, and then the whole program closes .
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Re: [Qgis-user] Issue with "Mesh Calculator" with a GRIB file

[Eric Compas]

Vincent,

Thanks! I updated to 3.16 and the expression worked just fine (once I
figured out the changes to the mesh interface).

Eric

On Tue, Feb 9, 2021 at 9:37 PM Vincent Cloarec  wrote:

> Hi,
> Which QGIS version?
>
> It seems 3.10.
> Can you try with 3.16?
>
> Regards.
>
> Vincent
>
> Le mar. 9 févr. 2021 à 22:55, Eric Compas  a écrit :
>
>> All,
>>
>> I'm experimenting with the mesh viewing and analysis tools
>> in QGIS (3.12.3) using both the Crayfish and QGribDownloader plugins. All's
>> going very well, and for the most part, the tools are relatively easy to
>> use.
>>
>> While I've gotten several "Mesh calculator" expressions to work correctly
>> with a GRIB file (downloaded using the QGribDownloader plugin), I'm running
>> into an error with any expression using precipitation group, e.g.:
>>
>> ("Temperature [C]" > 10) and ("03 hr Total precipitation [kg/(m^2)]" < 2)
>>
>>
>> This expression yields an error "Mesh calculator: Invalid or incompatible
>> datasets used." I've tried several permutations and start/end ranges. All
>> without luck.
>>
>> Investigating further, it seems like the number of time "slices" in the
>> precipitation group isn't the same as in the temperature group and may not
>> be handled correctly in QGIS (??). In the temperature group layer
>> properties, the time slider and metadata times are always the same
>> (synchronized).  For the precipitation group, the time slider and metadata
>> in the layer properties aren't in sync:
>>
>> [image: 2021-02-06_10-34-02b.gif]
>> I suspect that the precipitation group has fewer time "slices" that may
>> not be handled correctly and hence the error in the "Mesh Calculator" tool.
>>
>> Is this a user error or some issue with how the mesh tools handle groups
>> with differing number of time "slices?"
>>
>> I'd appreciate any help.
>>
>> Thanks,
>>
>> Eric
>>
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Re: [Qgis-user] Support - representing a graph in Qgis

[Giacomo Uguccioni]

Thanks a lot!
I would like to represent a shapefile or more shapefiles of nodes and
connections (lines and points)
in a layout similar to an electrical scheme, a symbolic and conceptual
scheme and not a geographical one.
I attached an image with qgis view and output that I would like to get.

Il giorno mer 10 feb 2021 alle ore 01:25 Jorge Gustavo Rocha <
j...@geomaster.pt> ha scritto:

> Hi Giacomo,
>
> Maybe it is better to share a sketch of what you want.
>
> 0) From the description of your use case, you can use the geographic
> position of the nodes, right? You might be able to do what you want just by
> creating points where you want to show the grid voltage and then create
> direct lines between nodes. If you can display it on the map, you don't
> need a graph.
>
> 1) Yes, you can use graphviz in the python console.
>
> 2) Graphviz does not read shapefiles. You have to iterate over your layer
> and generate the corresponding graph nodes and edges.
>
> Regards,
>
> Jorge Gustavo
> Às 23:06 de 09/02/21, Giacomo Uguccioni escreveu:
>
> Thank you guys for the support.
> Could I work with Graphviz in the python console inside Qgis? And does
> Graphviz support shapefiles or similar as an input?
>
> Il giorno mar 9 feb 2021 alle 20:07 Jorge Gustavo Rocha 
> ha scritto:
>
>> Hi,
>>
>> I second Chris's proposal. Using graphviz python module [1], you can
>> generate your graph by iterating over the features.
>>
>> At the end, just call the render and you will get the rendered graph
>> (just add view=True) within your QGIS environment. You need to know some
>> Python basic stuff, but not much than the basic.
>>
>> Regards,
>>
>> Jorge Gustavo
>>
>> [1] https://graphviz.readthedocs.io/en/stable/manual.html
>> Às 18:55 de 09/02/21, chris hermansen escreveu:
>>
>> Giacomo and list,
>>
>> On Tue, Feb 9, 2021 at 8:07 AM Giacomo Uguccioni <
>> giacomo.ugucci...@gmail.com> wrote:
>>
>>> Hello everyone, and thanks for the support.
>>> If this is not the place to ask for this kind of thing, I ask you to
>>> give me a link where I could find support.
>>> I'm a qgis 3.14 user. I would like to represent a tree diagram or
>>> functional diagram being able to draw the symbology and position of nodes
>>> and connections from the information contained in the attribute table.
>>> Example: I would like to represent the medium voltage grid of a city as an
>>> electrical diagram; I would like to represent with lines that join at nodes
>>> the roads that connect certain houses and schools in a city. So my goal is
>>> to be able to build a layout with symbology of nodes and connections
>>> derived from information contained in different shapefiles or within
>>> features, with a non-geographic but schematic / ideal criterion.
>>> Do you have any ideas or suggestions on how to do it? I thank you for
>>> every contribution.
>>>
>>>
>> Not a QGIS-based solution, but I've used graphviz 
>> to generate graphs from the command line with considerable success.  It
>> offers a small but useful programming language that can be combined with
>> data in text files in a really useful way.
>>
>> --
>> Chris Hermansen · clhermansen "at" gmail "dot" com
>>
>> C'est ma façon de parler.
>>
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>> *Geomaster*
>> *Jorge Gustavo Rocha* | Software Engineer
>> *e:* j...@geomaster.pt | *m:* +351 910 333 888
>> *g:* 41.54094,-8.40490 | *v: * 510 906 109
>> *a: * Rua António Cândido Pinto, 67, 4715-400 Braga
>> 
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> --
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> *Geospatial Data Acquisition & Processing*
> +39 3920431219
> Le informazioni contenute nella presente comunicazione sono riservate
> esclusivamente ai destinatari indicati in epigrafe. La diffusione del
> documento trasmesso da parte di qualsiasi soggetto diverso dal mittente e
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> sensi del D.Lgs. n. 196/2003 e regolamento UE n. 2016/679.
> Se avete ricevuto questo messaggio per errore, vi preghiamo di
> distruggerlo e di darcene immediata comunicazione anche inviando un
> messaggio di ritorno all’indirizzo e-mail del mittente.
>
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>

Re: [QGIS-it-user] inserimento immagini "pop-up"/link e web

[luca barbadoro]

Ciao,

ho affrontato il tuo stesso problema qualche tempo fa, la mia soluzione 
è stata usare qgis2web per esportare il progetto html. per farlo 
funzionare in modo decente da smartphone ti consiglio di usare leaflet 
nelle impostazioni e lasciare il progetto semplice senza attivare troppe 
opzioni (io ho lasciato solo geolocator e legenda collassabile).


ho creato una cartella "LOGHI" dove ho inserito le immagini che volevo 
visualizzate nel popup collegate al file puntuale.


in QGIS nel tabella associata al file puntuale (nel mio progetto ho solo 
file puntuali) ho creato campi inserendo direttamente le informazioni ai 
collegamenti esterni (per siti web, social, youtube, mail  direttamente 
l'indirizzo compreso https://www...), e ovviamente il campo con il nome 
del logo comprensivo del percorso  (LOGHI/06.png)


da mobile cliccando sull'oggetto puntuale si apre il popup, che 
visualizza l'immagine e gli indirizzi ai collegamenti esterni. questi 
cliccandoci mi richiama la funzione utile (se pagina web il browser, per 
numeri telefonici il telefono, per indirizzo mail l'app posta ecc)


per una corretta visualizzazione del popup una volta esportato con 
qgis2web ho dovuto aggiustare "manualmente" alcune impostazioni nel file 
index.html relativa alla tabella del popup modificando direttamente l' 
html  (vado a memoria: nella riga con link a immagine locale ho 
impostato la larghezza massima per uniformare le immagini, inoltre ho 
riscritto le formattazione delle righe e dei campi della tabella )


lo stesso nel file qgis2web.css per impostare la formattazzione degli stili

sicuramente ci sono approcci più rigorosi, ma il risultato per i miei 
fini regge!



Luca Barbadoro
__

Phone:  3337492444
E-mail: luca.barbad...@gmail.com
Skype:  lucabarbadoro
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Il 09/02/21 17:53, damiano lotto ha scritto:

Buongiorno!
Uso Qgis 3.6.13, su windows 10 64bit.
Scusate, ho un pò di domande, più che altro per sapere se è possibile 
fare quello che dovrei fare come scritto sotto, o se devo usare un 
altro approccio. Spero di non fare domande troppo stupide!
Sto seguendo un progetto (di ricerca, no fini di luco) molto semplice 
con una serie di punti che rappresentano le viste da dove sono state 
scattate delle foto, sia storiche che recenti. Le foto si riferiscono 
ai danni della prima guerra mondiale e di Vaia sulle montagne bellunesi.
a) vorrei, al click o passaggio sul singolo punto, che venisse 
mostrata la foto corrispondente e, ANCHE, la possibilità di clickare 
sulla foto per essere indirizzato a una pagina web esterna. Si tratta 
delle pagine informative con i contributi specialistici riguardo 
ambiente, guerra ecc. relativi al progetto (le pagine web sono sullo 
stesso server del WebGis, per cui vedi sotto).
Ho visto che tramite "azioni" posso mettere un link o una foto, ma mi 
pare di aver capito che non posso inserire entrambi.
b) da questo, tramite qgis2web, vorrei esportare il mio gis, 
possibilmente conservando le features sopra descritte al punto a). Qui 
si apre un altro problema: giustamente i miei superiori mi fanno 
notare che la maggior parte degli utenti vedranno il sito da device 
mobili. Come si comporta il webgis esportato? Non credo di avere lo 
spazio su di un monitor di cellulare per far comparire le foto; e 
l'azione "vai a pagina web" come si triggera da mobile? Sul pc 
ovviamente si usa il mouse, ma per il mobile, cosa potrei fare?
Penso di fare due versioni del web gis, uno mobile e uno per pc, ma 
per quello mobile temo che non ne esca un prodotto utilizzabile in 
questo modo.


Scusate per la lunghezza!
Saluti, Damiano.

--
*P* Per favore, pensate all’ambiente prima di stampare questa e-mail 
e/o i documenti allegati.


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Re: [Qgis-user] fondere 2 poligoni separati d fiume

[Alberto Grava]

Ciao!
se usi il comenado merge li fondi generando un poligono multi area? non va
bene come soluzione?
dal punto di vista topologico non è il massimo ma dipende dal tuo scopo
*__*
*Alberto Grava *
Pianificatore Territoriale
3224 sez. A, Albo APPC Tv
www.albertograva.it
via San Fris, 52
31029 Vittorio Veneto (TV)
t. +39 3494643461 p.i. 04960590265 | cod. uni. KRRH6B9




Think green!!

Print this email only if absolutely necessary. Thank you!
Stampa questa mail solo se strettamente necessario. Grazie!


Il giorno mer 10 feb 2021 alle ore 12:04 Giacomo Fontanelli <
giacomofontanell...@gmail.com> ha scritto:

> Salve
>
> ho 2 poligoni rappresentanti 2 aree.
>
> Vorrei fonderli in un poligono solo, il problema è che nel mezzo passa un
> fiume.
> A risultato finito vorrei che la larghezza del fiume non venisse
> considerata e che il nuovo poligono vi passasse semplicemente a cavallo.
>
> Qual è il modo più smart per farlo?
>
> Grazie
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[Qgis-user] fondere 2 poligoni separati d fiume

[Giacomo Fontanelli]

Salve

ho 2 poligoni rappresentanti 2 aree.

Vorrei fonderli in un poligono solo, il problema è che nel mezzo passa un
fiume.
A risultato finito vorrei che la larghezza del fiume non venisse
considerata e che il nuovo poligono vi passasse semplicemente a cavallo.

Qual è il modo più smart per farlo?

Grazie
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Re: [Qgis-user] [QGIS-Developer] timzonefinder vs point in polygon

[mail]

Seems there are at least two questions to have a look at.

To do a timezone lookup you need a relatively large datafile for the timezones. 
That could be part of a plugin/tool, or a separate file. Either way, you need 
to have that data stored and accessible somewhere. And it probably needs 
updating now and then.
Imho plugins should only provide the algorithm and some sort of ui. And maybe, 
when the plugin is always using the same dataset within it's algorithm, that 
dataset. Unless it is too large, and that was as I remember the first question 
you asked the user list Calvin. And that is still pending.
I have no problems downloading and storing a dataset, configure the plugin so 
it knows where I stored the dataset and have the plugin use that dataset 
whenever I would need t do a timezonze lookup.

The second question is finding and using the fastest algorithm.
If the Vector=>Datamanagement Tools->Join Attributes by Location is the fastest 
(is it indeed? cross platform, independent of hardware), is there a way to use 
that processing tool, which is part of the core tool set , within your 
datetimetools plugin?
I have no experience with building a plugin, but I would hope integrating (or 
calling on?) tools from the processing toolbox within a plugin should be 
supported. Seems weird you would have to rewrite an existing tool for it to be 
used by a plugin.

Jeroen



-Oorspronkelijk bericht-
Van: Nyall Dawson  
Verzonden: dinsdag 9 februari 2021 23:42
Aan: Matthias Kuhn 
CC: C Hamilton ; Groene Bij ; 
qgis-user ; Andrea Giudiceandrea 
; qgis-developer 
Onderwerp: Re: [QGIS-Developer] timzonefinder vs point in polygon

On Wed, 10 Feb 2021 at 03:32, Matthias Kuhn  wrote:
>
> Hi Calvin,
>
> If you are looking for speed I would consider putting things into memory.
> I have seen that timezonefinder has an in_memory option which makes it even 
> faster.
> On QGIS side you can also load features into a memory layer and add a spatial 
> index to that.

Just to add to this -- if you pre-prepared the timezone polygon geometries and 
cached all the results then that's the fastest speed you'll ever achieve :) (at 
the cost of memory usage, however!)

Nyall

>
> Hope that helps to squeeze the last bit of performance out of this 
> Matthias
>
> On Tue, Feb 9, 2021 at 5:52 PM C Hamilton  wrote:
>>
>> It is highly likely that you have a much faster machine than mine so I can 
>> only look at comparative times between timezonefinder and the PyQGIS code 
>> included below. You will notice that I take a snapshot of the time before 
>> and after I iterate through the 10,000 points using both timezonefinder as a 
>> look up and the code Nyall proposed. That is how I am getting the times. 
>> What I am really trying to determine is the fastest way to look up a point 
>> using either timezonefinder or PyQGIS code. Perhaps what I have with PyQGIS 
>> code is fast enough, but I am not satisfied if it is not close to the speed 
>> of timezonefinder.
>>
>> Ultimately, I am trying to determine whether I should continue to use 
>> timezonefinder as the method to look up time zones in my datetimetools 
>> plugin or should I have the gpkg time zone polygon layer as a part of the 
>> plugin and do lookups using it. Right now I am just doing single point 
>> lookups and it is probably fast enough, but I don't like that it is slower 
>> than timezonefinder. I am likely to expand datetimetools plugin to have a 
>> processing algorithm to do a lookup on a whole layer and in that case the 
>> PyQGIS method is better.
>>
>> Those are my thoughts and if there is a faster method using the gpkg time 
>> zone polygon to do the lookup, let me know.  One thing I just tried was 
>> using the shapefile from  
>> https://github.com/evansiroky/timezone-boundary-builder. It appears it is 
>> not spatially indexed and was taking too long. I resaved it as a shapefile 
>> and made sure it had a spatial index, but the gpkg conversion of the 
>> shapefile is even faster to access.
>>
>> Calvin
>>
>> On Tue, Feb 9, 2021 at 11:19 AM  wrote:
>>>
>>> Hi Calvin,
>>>
>>>
>>>
>>> Thanks for sending me this from the Developers list. I am not a part of the 
>>> Developer list, so I did not see the Join attribute by location tip from 
>>> Andrea.
>>>
>>>
>>>
>>> Anyway, what do you mean with not getting fast result with single point 
>>> lookups?
>>>
>>> When I select a single point from the 1 point layer and run the same 
>>> algorithm (check the selected features only option in the dialogue box), 
>>> the result takes 0.05 seconds (12 seconds for all 1). At least that is 
>>> what is says in the log tab of the algorithm. And it sure looks quick.
>>>
>>>
>>>
>>> Jeroen
>>>
>>>
>>>
>>>
>>>
>>> Van: C Hamilton 
>>> Verzonden: dinsdag 9 februari 2021 16:25
>>> Aan: Nyall Dawson 
>>> CC: Andrea Giudiceandrea ; qgis-developer 
>>> ; Groene Bij 
>>> Onderwerp: Re: [QGIS-Developer] timzonefinder vs point in polygon
>>>
>>>
>>>
>>> Nyall,
>>>
>>>
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