[QGIS-it-user] Poligoni frammentati

[Mauro D'Ambroso]

Salve a tutti.

Ho un problema con i cosiddetti poligoni frammentati.
In un tema multipoligonale, mi trovo con oltre 3000 piccolissimi poligoni
adiacenti ad altri.
In QGis 2.18 c'era l'utile algoritmo nel processing "Elimina poligoni
frammentati", che però non ritrovo in Qgis 3.2. Ho cercato in tutti i
sottomenù del processing, leggendo anche la descrizione delle funzioni ma
non mi pare di aver individuato un suo eventuale sostituto.
Qualcuno mi può illuminare o indicare un procedimento per eliminarli. Si
tratterebbe di assegnare un poligono di area molto piccola a quello
contiguo di area più grande senza tener conto degli attributi del primo.

Grazie in anticipo.

Mauro
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[Qgis-user] Conversion of shapefile to GPKG

[Patrick Dunford]

Good day all

I have been converting shapefiles to geopackage in a number of Qgis map 
projects I have.


There have been a number of issues encountered. One of these is when 
there is an existing FID field in the data table that does not conform 
to the integrity rules required for the reserved fid field in the 
geopackage data table. The inbuilt conversion is assuming the existing 
FID field will meet data integrity requirements and creates problems if 
it does not.


Is or should this type of issue be covered adequately in documentation.


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Re: [Qgis-user] QGIS 3 Processing question

[Nyall Dawson]

On Fri, 29 Jun 2018 at 07:14, Frank Broniewski
 wrote:
>
> def processAlgorithm(self, parameters, context, feedback):


You're making this tricky for yourself! Cut out everything in
processAlgorithm related to self.INPUT, and just pass the parameter
value direct to the child algorithm to handle:

> params = {
>
> 'INPUT': parameters[self.INPUT],
>
> 'DISTANCE': pt_value,
>
> 'START_OFFSET': 0,
>
> 'END_OFFSET': 0,
>
> 'OUTPUT': 'memory:'
>
> }


Nyall
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[Qgis-user] QGIS 3 Processing question

[Frank Broniewski]

Hi all,

 

I am getting my feet wet with the new QGIS 3 Processing script syntax. In my
script I want to use some other processing scripts from the toolbox. I think
I got most things right, but I do not get a result back. For testing I just
try to use ‘qgis:pointsalonglines’ on a temporary polygon layer and return
the points as a result. Here’s what I have so far:

 

def initAlgorithm(self, config=None):

self.addParameter(

QgsProcessingParameterFeatureSource(

self.INPUT,

self.tr("Vector Polygon Layer"),

[QgsProcessing.TypeVectorPolygon]

)

)

[…]

self.addParameter(

QgsProcessingParameterFeatureSink(

self.OUTPUT,

self.tr('Center line'),

QgsProcessing.TypeVectorAnyGeometry

)

)

 

 

def processAlgorithm(self, parameters, context, feedback):

source = self.parameterAsSource(parameters, self.INPUT, context)

# turn QgsProcessingParameterFeature - the source -  into a 

# QgsVectorLayer apparently self.parameterAsVectorLayer() does 

# not work on temporary layers so this step is required to use

# the input layer in processing algorithms

source_vl = source.materialize(QgsFeatureRequest())

 

pt_value = […]

 

# qgis:pointsalonglines

params = {

'INPUT': source_vl, 

'DISTANCE': pt_value,

'START_OFFSET': 0,

'END_OFFSET': 0,

'OUTPUT': 'memory:'

}

 

points = processing.run(

'qgis:pointsalonglines', 

params, context=context, feedback=feedback

)['OUTPUT']

return {self.OUTPUT: points}

 

 

running the script gives the following output in the processing window
(including some debug info not included above):

 

Eingabeparameter:

{ 'DISTANCE' : 10, 'INPUT' :
'Polygon?crs=EPSG:31466={e1a2d6cf-0cac-46f5-b1c8-ee208c497d22}',
'OUTPUT' : 'memory:' }

 



Ergebnisse: {'OUTPUT': 'output_953bb179_3f12_4312_89e4_5ffa13e8336b'}



Ausführung nach 0.03 Sekunden abgeschlossen

Ergebisse:

{'OUTPUT': }

 

Lade Ergebnis Layer

Algorithmus 'None' beendet

 

The last output line does not look right to me, any idea what I am doing
wrong here?

 

Many thanks,

Frank

 

 

Dipl. Geogr. Frank Broniewski

Waldhölzbacher Str. 51

66679 Losheim am See

06872 509 068 4

0176 611 26 9 2 6

  www.frankbroniewski.com

 



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Description: S/MIME cryptographic signature
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Re: [Qgis-user] 3D Map Views and XYZM values

[Martin Dobias]

Hi Tyler

On Wed, Jun 20, 2018 at 4:01 PM, Tyler Veinot  wrote:
> Hi All;
> I have been experimenting with the 3D viewer in QGIS3 and was wondering how
> the ZM values are interpreted or if they are at all. When I tested with the
> points and polygons it looked like the Z was interpreted as a extrusion or
> height; but when I measure all objects seem to be the same size regardless
> of M value can someone verify if a M value is interpreted at all in the 3D
> view?

Z values are interpreted as elevation - this should work for points,
linestrings and polygons.
M values are not interpreted.


> Another question, for polygons I can use fields to define things like,
> extrusion, elevation, scale, etc...  but I cannot for points or lines in 3D;
> I was sure I could do this in the 3.0.0 build (currently at 3.0.3). Is
> adding this capability something that is being looked into for future
> versions?

Right, this is not implemented yet. Hopefully it will be added
sometime soon, but there is no roadmap for that...

Regards
Martin
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Re: [QGIS-it-user] "Sfogliare" oggetti selezionati

[Sergio Gollino]

Volevo segnalarvi che abbiamo rilasciato la nuova versione del plugin (1.14
con alcune modifiche e piccole correzioni). per ora in versione Qgis 2.18,
è in lavorazione il porting per 3.x.

Saluti a tutti


Il giorno 14 novembre 2017 13:00, Marco  ha
scritto:

> Prima prova del fuoco ufficiale di Go2nextfeature al cospetto dei colleghi
> CAD dipendenti e allergici al GIS.
> Revisione finale del layer contenete una quindicina di poligoni sparsi su
> tutto il territorio.
> Uso combinato, ad arte, di Go2nextfeature e di Tabella attributi in
> modalità
> Modulo (vedi screenshot allegato), condito qua e la con qualche
> sovrapposizione al volo alle foto satellitari e, quanto basta, un paio di
> pennellate d'autore con Go2StreetView, ecc.
> Risultato: Spettacolare. Gli ho stupiti con effetti speciali e ho fatto il
> fanatico.
> Rosicamento completo con travaso di bile per invidia malamente soffocata da
> parte dei colleghio CAD dipendenti.
> Grazie
>
> 
>
>
>
>
>
> --
> Sent from: http://osgeo-org.1560.x6.nabble.com/QGIS-Italian-User-
> f5250612.html
> ___
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>



-- 
Sergio Gollino

Questo messaggio, comprensivo di eventuali allegati, è ad uso esclusivo del
destinatario e potrebbe contenere  informazioni riservate; se è stato
recapitato per errore ci scusiamo per l'accaduto e Vi invitiamo
cortesemente a darcene notizia provvedendo alla sua distruzione.
Vi ricordiamo che la diffusione, l'utilizzo e/o la conservazione dei dati
ricevuti per errore costituiscono violazione alle disposizioni del D.Lgs.
n. 196/2003 "Codice in materia di protezione dei dati personali".
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[QGIS-it-user] [promo] Corso di Geodatabase: PostgreSQL e PostGIS

[Matteo Ghetta]

Salve,

è in preparazione il prossimo corso di Faunalia, Geodatabase: PostgreSQL
e PostGIS dal 12 al 14 settembre 2018 a Pontedera.

Invito gli interessati ad iscriversi al più presto, per consentirci di
organizzare al meglio la logistica.

Ricordiamo che Faunalia è abilitata a rilasciare la certificazione
internazionale riconosciuta dall'associazione QGIS.ORG
(​http://changelog.qgis.org/en/qgis/certifyingorganisation/qgis-faunalia/):
il costo aggiuntivo di questa certificazione serve a finanziare
direttamente QGIS.

Ulteriori dettagli qui: ​http://www.faunalia.eu/it/training.html#calendario

Non esitate a chiedere ulteriori info se necessarie.

Cordiali saluti.

Matteo Ghetta
-- 
Matteo Ghetta - www.faunalia.eu
QGIS & PostGIS courses: http://www.faunalia.eu/training.html
https://www.google.com/trends/explore?date=all=IT=qgis,arcgis
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[QGIS-it-user] Plugin autoSaver in QGIS 2.18.21 LTR

[Massimo A.]

Buongiorno a tutti.
questa mattina ho aggiornato la mia versione QGIS LTR all'ultima 
versione QGIS 2.18.21

ed è apparso un problema python con questo plugin.

E' un mio problema o potrebbe essere un bug ?

Utilizzo Windows 10 a 64 bit

Grazie

Massimo




https://plugins.qgis.org/plugins/autoSaver/


Si è verificato un errore durante l'esecuzione del codice Python:

TypeError: write() takes exactly 2 arguments (1 given)

Traceback (most recent call last):   File 
"C:/Users/info/.qgis2/python/plugins\autoSaver\autosave.py", line 370, 
in cronEvent     self.saveCurrentProject()   File 
"C:/Users/info/.qgis2/python/plugins\autoSaver\autosave.py", line 399, 
in saveCurrentProject     QgsProject.instance().write() TypeError: 
write() takes exactly 2 arguments (1 given)



Versione Python: 2.7.14 (v2.7.14:84471935ed, Sep 16 2017, 20:25:58) 
[MSC v.1500 64 bit (AMD64)]

Versione di QGIS: 2.18.21 Las Palmas, 9fba24a3f2

Percorso Python:

  * C:/PROGRA~1/QGIS2~1.18/apps/qgis-ltr/./python/plugins\processing
  * C:/PROGRA~1/QGIS2~1.18/apps/qgis-ltr/./python
  * C:/Users/info/.qgis2/python
  * C:/Users/info/.qgis2/python/plugins
  * C:/PROGRA~1/QGIS2~1.18/apps/qgis-ltr/./python/plugins
  * C:\PROGRA~1\QGIS2~1.18\bin\python27.zip
  * C:\PROGRA~1\QGIS2~1.18\apps\Python27\DLLs
  * C:\PROGRA~1\QGIS2~1.18\apps\Python27\lib
  * C:\PROGRA~1\QGIS2~1.18\apps\Python27\lib\plat-win
  * C:\PROGRA~1\QGIS2~1.18\apps\Python27\lib\lib-tk
  * C:\PROGRA~1\QGIS2~1.18\bin
  * C:\PROGRA~1\QGIS2~1.18\apps\Python27
  * C:\PROGRA~1\QGIS2~1.18\apps\Python27\lib\site-packages
  * 
C:\PROGRA~1\QGIS2~1.18\apps\Python27\lib\site-packages\jinja2-2.7.2-py2.7.egg
  * 
C:\PROGRA~1\QGIS2~1.18\apps\Python27\lib\site-packages\markupsafe-0.23-py2.7-win-amd64.egg
  * C:\PROGRA~1\QGIS2~1.18\apps\Python27\lib\site-packages\win32
  * C:\PROGRA~1\QGIS2~1.18\apps\Python27\lib\site-packages\win32\lib
  * C:\PROGRA~1\QGIS2~1.18\apps\Python27\lib\site-packages\Pythonwin
  * 
C:\PROGRA~1\QGIS2~1.18\apps\Python27\lib\site-packages\Shapely-1.2.18-py2.7-win-amd64.egg
  * C:\PROGRA~1\QGIS2~1.18\apps\Python27\lib\site-packages\wx-2.8-msw-unicode
  * C:\PROGRA~1\QGIS2~1.18\apps\Python27\lib\site-packages\xlrd-0.9.2-py2.7.egg
  * C:\PROGRA~1\QGIS2~1.18\apps\Python27\lib\site-packages\xlwt-0.7.5-py2.7.egg
  * C:/Users/info/.qgis2//python
  * C:/Users/info/.qgis2/python/plugins\go2streetview
  * C:\Users\info\.qgis2\python\plugins\mmqgis/forms
  * C:\Users\info\.qgis2\python\plugins
  * C:\Users\info\.qgis2\python\plugins
  * C:\Users\info\.qgis2\python\plugins\QuickMultiAttributeEdit/forms



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Re: [Qgis-user] Getting file name from parameterAsFile

[Rudi von Staden]

On Thu, 28 Jun 2018 at 00:37, Nyall Dawson  wrote:

> If you swap to a QgsProcessingParameterFile then parameterAsFile
> should work as expected.


Thanks Nyall, that did the trick!

Kind regards,
Rudi
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Re: [Qgis-user] Ordinary Kriging in QGIS

[Nyall Dawson]

On Thu, 28 Jun 2018 at 16:51, Falk Huettmann  wrote:

> Like well-shown with home range analysis, kernels, random number generators, 
> optimizations and many predictions and model
> selection tools, one may then ignore those outputs for a serious analysis.
>
> The initial idea of open source was arguably that those things can be tested, 
> and improved, yes ?
>

Sure is - go for it! The source is out there, all projects (including
QGIS) would love you to review their code and algorithms.

For QGIS, you can start here:

https://github.com/qgis/QGIS/tree/master/src/analysis
https://github.com/qgis/QGIS/tree/master/python/plugins/processing/algs/qgis

For SAGA, start here:

https://github.com/johanvdw/SAGA-gis-git-mirror/tree/master/saga-gis/src/tools


Looking forward to the results!

Nyall
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Re: [Qgis-user] Ordinary Kriging in QGIS

[Andreas Neumann]

Hi, 

I suggest discussing these issues on the SAGA mailing list. QGIS is just
the frontend software in this case. 

All questions around the particular implementation should be discussed
with SAGA developers. 

Greetings, 

Andreas 

On 2018-06-28 08:51, Falk Huettmann wrote:

> Hi all, 
> 
> Just now it comes to my attention (sorry):
> 
> last years I went to a statistical session where the ESRI coders of the 
> krigging module 
> talked about 'issues' of the implementation there, and it was beyond scary 
> for me 
> (=>assumptions, merging outputs, edge issues etc. Krigging as such is pretty 
> sensitive to 
> underlying assumptions and data). 
> 
> So my question is:  
> what is the science-basis for krigging in QGIS ? 
> 
> Or asked other way round:  
> how can it be assured that the krigged results are meaningful and correct ? 
> 
> If there is none of such metrics to assure it, then it's just another of the 
> many 
> shiny tools and 'homebrews' (not peer-reviewed and QA'ed really) out there 
> that mis-inform. 
> 
> Like well-shown with home range analysis, kernels, random number generators, 
> optimizations and many predictions and model 
> selection tools, one may then ignore those outputs for a serious analysis. 
> 
> The initial idea of open source was arguably that those things can be tested, 
> and improved, yes ? 
> 
> I am open to hear feedback, examples and ideas for a betterment. 
> 
> Thanks so much; kind regards 
> Falk Huettmann 
> 
> On Wed, Jun 27, 2018 at 11:39 PM, PARESH CHAUKHANDE 
>  wrote:
> 
>> Hello, 
>> I am using QGIS v3.0.3 on macOSX(High Sierra).  
>> I want to do ordinary kriging in QGIS. 
>> I have 13 data points representing a state of yield attributes of 
>> agricultural crops. I am also having .shp files of states. I am doing 
>> following steps: 
>> Processing> Toolbox> SAGA> Ordinary Kriging. The process runs OK and two new 
>> layers are created called Quality Measure and Prediction, but both these 
>> layers are invisible or show no information. 
>> Kindly help me on these issues. 
>> Thank you. 
>> 
>> Sincerely yours, 
>> 
>> PARESH CHAUKHANDE 
>> ___
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Re: [Qgis-user] Ordinary Kriging in QGIS

[Falk Huettmann]

Hi all,

Just now it comes to my attention (sorry):

last years I went to a statistical session where the ESRI coders of the
krigging module
talked about 'issues' of the implementation there, and it was beyond scary
for me
(=>assumptions, merging outputs, edge issues etc. Krigging as such is
pretty sensitive to
underlying assumptions and data).

So my question is:
what is the science-basis for krigging in QGIS ?

Or asked other way round:
how can it be assured that the krigged results are meaningful and correct ?

If there is none of such metrics to assure it, then it's just another of
the many
shiny tools and 'homebrews' (not peer-reviewed and QA'ed really) out there
that mis-inform.

Like well-shown with home range analysis, kernels, random number
generators, optimizations and many predictions and model
selection tools, one may then ignore those outputs for a serious analysis.

The initial idea of open source was arguably that those things can be
tested, and improved, yes ?

I am open to hear feedback, examples and ideas for a betterment.

Thanks so much; kind regards
 Falk Huettmann



On Wed, Jun 27, 2018 at 11:39 PM, PARESH CHAUKHANDE <
paresh.chaukha...@gmail.com> wrote:

> Hello,
>   I am using QGIS v3.0.3 on macOSX(High Sierra).
>   I want to do ordinary kriging in QGIS.
>   I have 13 data points representing a state of yield attributes of
> agricultural crops. I am also having .shp files of states. I am doing
> following steps:
>   Processing> Toolbox> SAGA> Ordinary Kriging. The process runs OK and
> two new layers are created called Quality Measure and Prediction, but both
> these layers are invisible or show no information.
>   Kindly help me on these issues.
>   Thank you.
>
>
> Sincerely yours,
>
> PARESH CHAUKHANDE
>
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Re: [Qgis-user] QGIS 2.18 freeze meanwhile editing

[Andreas Neumann]

Hi Andrea, 

Do you have any plugins enabled? I heard of situations, where a badly
programmed Python plugin could cause such issue. 

Can you try starting QGIS without any Python-plugin enabled - see the
--noplugins option at
https://docs.qgis.org/2.18/en/docs/user_manual/introduction/getting_started.html#command-line-options.

I can't promise if it helps to resolve the issue, but if it does, it
would be useful to know which plugin is the culprit.

Greetings,
Andreas

On 2018-06-28 08:32, Andrea Peri wrote:

> Hi, 
> I'm using qgis 2.18. 
> Every time I goin ediiting on a shapefile , after insert about 10 or 20 
> features it (the qgis) is freezing. Windows (I use win 7) report me qgis is 
> not responding and I need to kill it and restart. 
> 
> I usually do not lost nothing because I know this and after every on insert I 
> save always the shapefile and the project. 
> But it is boring. 
> I like to know if this is a know issue of qgis or it could be a specific 
> issue of my qgis install. 
> 
> I use qgis 2.18.18 (32 bit) but it happened also when I use 2.14 and windows 
> 7 64 bit. 
> 
> Many thx. 
> 
> -- 
> -
> Andrea Peri
> . . . . . . . . . 
> qwerty àèìòù
> - 
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Re: [Qgis-user] QGIS 2.18 freeze meanwhile editing

[Andrea Peri]

Thx to both.

I rename the .qgis folder and try to editi using this new configuration.
Fortunatelly I do not need any plugin for my work. I use only a wms map to
retrace the geometries.



2018-06-28 8:39 GMT+02:00 Richard Duivenvoorde :

> On 06/28/2018 08:32 AM, Andrea Peri wrote:
> > Hi,
> > I'm using qgis 2.18.
> > Every time I goin ediiting on a shapefile , after insert about 10 or 20
> > features it (the qgis) is freezing. Windows (I use win 7) report me qgis
> > is not responding and I need to kill it and restart.
>
> Hi Andrea,
>
> Can you try it with a new configuration (as rename your .qgis2 dir to
> start with a fresh one)?
>
> Historically this kind of behaviour had to do do with rogue plugins...
> So first thing is to check if a plugin is doing this.
>
> Regards,
>
> Richard Duivenvoorde
>



-- 
-
Andrea Peri
. . . . . . . . .
qwerty àèìòù
-
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Re: [Qgis-user] QGIS 2.18 freeze meanwhile editing

[Richard Duivenvoorde]

On 06/28/2018 08:32 AM, Andrea Peri wrote:
> Hi,
> I'm using qgis 2.18.
> Every time I goin ediiting on a shapefile , after insert about 10 or 20
> features it (the qgis) is freezing. Windows (I use win 7) report me qgis
> is not responding and I need to kill it and restart.

Hi Andrea,

Can you try it with a new configuration (as rename your .qgis2 dir to
start with a fresh one)?

Historically this kind of behaviour had to do do with rogue plugins...
So first thing is to check if a plugin is doing this.

Regards,

Richard Duivenvoorde
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[Qgis-user] Ordinary Kriging in QGIS

[PARESH CHAUKHANDE]

Hello,
  I am using QGIS v3.0.3 on macOSX(High Sierra). 
  I want to do ordinary kriging in QGIS.
  I have 13 data points representing a state of yield attributes of 
agricultural crops. I am also having .shp files of states. I am doing following 
steps:
  Processing> Toolbox> SAGA> Ordinary Kriging. The process runs OK and two new 
layers are created called Quality Measure and Prediction, but both these layers 
are invisible or show no information.
  Kindly help me on these issues.
  Thank you.


Sincerely yours,

PARESH CHAUKHANDE___
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Re: [Qgis-user] QGIS 2.18 freeze meanwhile editing

[Bernhard Ströbl]

I assume a plugin is causing your problem; try to deactivate all plugins 
and check if the problem persists. If not reactivate them one by one to 
identify the one that causes the problem.

Bernhard

Am 28.06.2018 um 08:32 schrieb Andrea Peri:

Hi,
I'm using qgis 2.18.
Every time I goin ediiting on a shapefile , after insert about 10 or 20
features it (the qgis) is freezing. Windows (I use win 7) report me qgis is
not responding and I need to kill it and restart.

I usually do not lost nothing because I know this and after every on insert
I save always the shapefile and the project.
But it is boring.
I like to know if this is a know issue of qgis or it could be a specific
issue of my qgis install.

I use qgis 2.18.18 (32 bit) but it happened also when I use 2.14 and
windows 7 64 bit.

Many thx.



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[Qgis-user] QGIS 2.18 freeze meanwhile editing

[Andrea Peri]

Hi,
I'm using qgis 2.18.
Every time I goin ediiting on a shapefile , after insert about 10 or 20
features it (the qgis) is freezing. Windows (I use win 7) report me qgis is
not responding and I need to kill it and restart.

I usually do not lost nothing because I know this and after every on insert
I save always the shapefile and the project.
But it is boring.
I like to know if this is a know issue of qgis or it could be a specific
issue of my qgis install.

I use qgis 2.18.18 (32 bit) but it happened also when I use 2.14 and
windows 7 64 bit.

Many thx.

-- 
-
Andrea Peri
. . . . . . . . .
qwerty àèìòù
-
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[QGIS-it-user] Un esempio di gestione smart della Legenda con QGIS

[Marco Spaziani]

Spesso, per chiarezza grafica, è utile che in Legenda, sotto una stessa
voce, sia possibile far comparire elementi di tipologia diversa, ossia, è
utile che sotto una stessa voce di Legenda sia possibile raggruppare
elementi riferibili a punti, a linee e a poligoni. Ciò sembrerebbe in
contraddizione con il principio basilare della logica GIS che non consente
di “mescolare” nello stesso layer punti, linee e poligoni ma in realtà,
trattandosi solo di un “abbellimento” grafico della Legenda, per renderla
più leggibile, QGIS, (che è mentalmente più elastico di me e di tanti altri
ortodossi come me), ti consente tranquillamente di farlo (in Legenda) senza
alterare la logica del GIS. Infatti, in Legenda (sia nella TOC che nella
Legenda “cartacea” di Gestore di stampe) è possibile creare dei “Gruppi” e
dentro i gruppi inserirci, con un semplice “drag & drop” tutti i layer che
vogliamo, siano essi punti e/o linee e/o poligoni. Nello specifico, dovendo
far comparire in Legenda una voce “Siti analizzati” e poiché i siti
analizzati erano riferiti sia a scavi lungo trincee (layer di linee) sia a
scavi in pozzetti (layer di punti), in Legenda ho creato un Gruppo, l’ho
rinominato “Siti analizzati” e con il “drag & drops” gli ho inserito dentro
il layer di linee relativo alle trincee (oltretutto categorizzato) e il
layer di punti relativo ai pozzetti (anch’esso categorizzato). Così facendo
la leggibilità della Legenda è diventata ottimale.
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