Re: [Qgis-user] Qgis crashes while loading WMTS layers

[Patrick Dunford]

Further investigation and comment

Since recently installing Qgis 3.4.15 or 3.4.14 on some of my computers 
running Debian 10, I immediately began to see a trend of the software 
exhibiting an increased tendency to crash when working with certain WMTS 
layers that I had previously worked with extensively over recent weeks 
for mapping purposes.


After attempting numerous changes including special versions of projects 
containing no file based raster layers and only containing one WMTS 
layer at a time and being unable to use the software regardless I 
created a virtual machine running Debian 9 which has the latest version 
available for that platform, 3.4.4. This has resulted in immediate major 
improvement in the reliability of the software to the point I can resume 
using it without the numerous crashes of the software that have been 
noted recently, especially in the last week approximately.


On 27/01/20 1:19 am, Patrick Dunford wrote:

Good day to all.

Not so long ago I wrote a post about issues handling large numbers of 
raster files. This results from what appears to be an architectural 
design limitation of Qgis in that it only has enough resources 
available for a certain (unknown) number of raster layers and does not 
have any effective system for dealing with the exhaustion of these 
resources.


I also noted that the software does not appear to have the ability to 
use the swap (virtual memory) resources within a system to deal with 
the apparent exhaustion of resources, as other software would. For 
example, Gimp which I use for graphical editing is able to handle 
certain projects using a swap space of 200 GB, which consists of 32 GB 
of physical RAM and the rest in SSD. It is not unusual with some of 
these graphics projects to have 100 GB or more of swap space in use, 
without crashing the system. (This being possible since Gimp 2.10 with 
its ability to write files of more than 4 GB)


Whilst it is possible to manage the number of layers with file based 
rasters, this cannot be done with a WMTS server because there is no 
way I am aware of to manage the number of layers that can be 
downloaded from the server.


Version 2.18 and earlier almost never crashed with excess layers, 
usually all that would happen is a layer would be displayed with 
invalid data. However, crashes have become the norm with 3.x versions 
of software.


It seems to me there is a big architectural problem in the software 
with its inability to utilise the full resources of the system in 
order to process the number of layers that a WMTS server is capable of 
issuing.



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Re: [Qgis-user] Plugin Slicer

[Nicolas Cadieux]

Google translate:

Hello,
I am new to using Qgis and need to use the SLICER plugin but I did not 
find it in the version I installed (3.10.0) I found D.E.M. slicer that 
is very different!
Is there a solution to download the original SLICER version 2.14 in Qgis 
3.10?


Thankful,

Everton

On 2020-01-31 2:11 p.m., Everton Soares wrote:

Olá,
sou novo na utilização do Qgis e preciso utilizar o plugin SLICER 
porém não localizei na versão que instalei (3.10.0) localizei o D.E.M. 
slicer que é bem diferente!

Existe solução para baixar o SLICER original da versão 2.14 no Qgis 3.10?

Grato,

Everton

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[Qgis-user] Plugin Slicer

[Everton Soares]

Olá,
sou novo na utilização do Qgis e preciso utilizar o plugin SLICER porém não
localizei na versão que instalei (3.10.0) localizei o D.E.M. slicer que é
bem diferente!
Existe solução para baixar o SLICER original da versão 2.14 no Qgis 3.10?

Grato,

Everton
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Re: [QGIS-it-user] baco api di formattazione coordinate in DMS o cosa?

[SC]

Il 31/01/2020 09:53, Andrea Giudiceandrea ha scritto:

Ciao SC,
la funzione formatY è definita [1] come:

static QString formatY (double y, Format format, int precision=12,
FormatFlags flags=FlagDegreesUseStringSuffix)

quindi dovresti indicare prima il formato e poi la precisione:

QgsCoordinateFormatter.formatY(35.50822371518,QgsCoordinateFormatter.FormatDegreesMinutesSeconds,3)

A presto.

Andrea

[1] https://qgis.org/api/classQgsCoordinateFormatter.html



pazzesco ho guardato la documentazione e riguardato , provato e 
riprovato e non mi ero accorto dell'ordine

anzi ero convinto di aver fatto anche quella prova

mote grazie

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Re: [Qgis-user] Print layout menu missing Add North Arrow option 3.10.1 to 3.10..2

[Newcomb, Doug]

Hi Folks,
I reopened the project today and the Add North Arrow option was back.  Either I 
was very tired yesterday, or I needed to restart QGIS.  I'm betting on the 
former.  Sorry for the noise.

Doug

From: Newcomb, Doug
Sent: Friday, January 31, 2020 9:01 AM
To: qgis-user@lists.osgeo.org 
Subject: Print layout menu missing Add North Arrow option 3.10.1 to 3.10..2

Hi Folks,
I noticed that between 3.10.1 and 3.10.2 the Add North Arrow item was removed 
from the Print Layout menu, reverting back to the 3.4.x behavior of Add Image 
and then sync to map for the image.  Will this be permanent?

Doug

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[Qgis-user] Print layout menu missing Add North Arrow option 3.10.1 to 3.10..2

[Newcomb, Doug]

Hi Folks,
I noticed that between 3.10.1 and 3.10.2 the Add North Arrow item was removed 
from the Print Layout menu, reverting back to the 3.4.x behavior of Add Image 
and then sync to map for the image.  Will this be permanent?

Doug

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[Qgis-user] First Call For A New Training Course - An Introduction To Integrating QGIS/GIS And R For Spatial Analysis

[Colin D. MacLeod]

This is the first call for a brand new training course from GIS In Ecology. 
It's called 'An Introduction To Integrating QGIS.GIS and R For Spatial 
Analysis' and will be held in Glasgow, Scotland, between the 7th and 9th of 
April 2020. This course is aimed at those who wish to learn how to use and 
integrate QGIS (the leading freely available GIS software package) and R (the 
leading freely available data analysis software package) for spatial analysis. 
It will be taught by Dr. Colin D. MacLeod, the author of ‘An Introduction To 
Integrating QGIS And R for Spatial Analysis’ (Pictish Beast Publications) and a 
renowned expert in using GIS in biological and ecological research. He is also 
a co-author of the upcoming ‘An Introduction To Basic Statistics For Biologists 
Using R’, which is a practical guide to carrying out the analysis of biological 
data in R.  The course assumes no prior knowledge of either QGIS/GIS or R, and 
so is open to complete beginners as well as those how know how to use one of 
these software packages, and wish to learn how to integrate it with the other.

Attendance will be limited to a maximum of 16 people. The course for this three 
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students, the unwaged and those working for registered charities). To book a 
place, or for more information, visit 
http://gisinecology.com/an-introduction-to-integrating-qgis-gis-and-r-for-spatial-analysis/
 or email i...@gisinecology.com.

GIS and statistical analysis are two of the most fundamental software tools for 
modern biologists wishing to conduct spatial analyses. However, each have their 
own sets of software packages, and sometimes it can be difficult to know how to 
integrate the two. This course will provide an introduction to the integration 
of QGIS (the leading freely available GIS software package) and R (the leading 
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set that makes the most of the strengths of each of these individual software 
packages. It will consist of a series of background sessions on using GIS and R 
for spatial analysis, mixed in with practical sessions where you will learn how 
to use QGIS, how to use R, and how to integrate two to complete a spatial 
analysis project. This last part will include working through an example 
project, starting with creating a high quality map for publication through 
creating raster data layers of environmental variables, joining data together 
based on their spatial relationships and analysing the combined data set using 
R (including creating summary statistics, conducting linear regressions and 
conducting generalised additive modelling - GAMs). While it will primarily be 
based around QGIS, this course is taught using software-independent approach, 
and it is also open to those who wish to learn how to use ArcGIS to do 
biological GIS.

When you attend this course you will receive a free copy of An Introduction To 
Integrating QGIS And R for Spatial Analysis (GIS For Biologists Workbooks) as 
the practical exercises in that course are based on the ones contained in that 
book. NOTE: If you wish to use ArcGIS software for this course, alternative 
materials will be provided for the practical sessions.

==
GIS IN ECOLOGY - Providing Training, Advice And Consultancy On The Use Of GIS 
In Ecology

Web: www.GISinEcology.com Email: i...@gisinecology.com

Need to ask a question about using GIS? Try the GIS In Ecology Forum: 
www.GISinEcology.com/GIS_in_Ecology_forum.htm

Books From GIS In Ecology Staff:

GIS For Biologists: A Practical Introduction For Undergraduates; RRP: £24.99
An Introduction To Using GIS In Marine Biology; RRP: £44.99
An Introduction To Using GIS In Marine Biology: Supplementary Workbook One - 
Creating Maps Of Species Distribution; RRP: £19:99 

If you wish to purchase these books, visit: 
http://www.gisinecology.com/Book_Shop.htm

To help the environment, please do not print out this email unless it is 
unavoidable.
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Re: [QGIS-it-user] Grass in processing

[Paolo Cavallini]

la situazione di grass in qgis in effetti è un po' fragile
quali alg di grass ti servono ancora?

Il 31/01/20 14:07, Stefano Campus ha scritto:
> Prova ad editare qgis.ini
> 
> È tutto là...
> 
> s.
> 
> Il ven 31 gen 2020, 13:04 Luca Puglisi  > ha scritto:
> 
> Salve,
> 
> come accade spesso agli utenti Windows, all'aggiornamento di QGis con
> Osgeow chiamando gli algoritmi Grass, il programma non li trova. In
> passato sono riuscito ad indirizzare correttamente il caricamento degli
> strumenti Grass modificando il percorso ma ora, con 3.10.2-A Coruña
> trovo nelle opzioni di Processing il percorso della documentazione ma
> non quello per gli algoritmi. Qualcuno sa darmi indicazioni per
> risolvere?
> 
> Uso Windows 10
> 
> Grazie, un saluto a tutta la lista
> Luca Puglisi
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Re: [QGIS-it-user] Grass in processing

[Stefano Campus]

Prova ad editare qgis.ini

È tutto là...

s.

Il ven 31 gen 2020, 13:04 Luca Puglisi  ha scritto:

> Salve,
>
> come accade spesso agli utenti Windows, all'aggiornamento di QGis con
> Osgeow chiamando gli algoritmi Grass, il programma non li trova. In
> passato sono riuscito ad indirizzare correttamente il caricamento degli
> strumenti Grass modificando il percorso ma ora, con 3.10.2-A Coruña
> trovo nelle opzioni di Processing il percorso della documentazione ma
> non quello per gli algoritmi. Qualcuno sa darmi indicazioni per risolvere?
>
> Uso Windows 10
>
> Grazie, un saluto a tutta la lista
> Luca Puglisi
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Re: [Qgis-user] error loading tiff layer

[kirk]

The file may not be a geotiff and therefore require a seco d file in the 
directory in which it resides. A .twf or .aux file with the same name as your 
tiff file.Sent from my Samsung Galaxy smartphone.
 Original message From: Humberto Nel Florez Ramos 
 Date: 2020-01-31  7:10 AM  (GMT-04:00) To: 
Qgis-user@lists.osgeo.org Subject: [Qgis-user] error loading tiff layer 
regards.I could not load a layer in tiff format. The error that qgis shows 
is:"No transform is available between Unknown CRS: ENGCRS [" PCS Name = unnamed 
", EDATUM [" "], CS [Cartesia ... and Unknown CRS: GEOGCRS [" unknown ", DATUM 
[" unknown ", ELLIPSOID [" WGS 8 ... .No coordinate operations are available 
between these two reference systems ".The file has a reference system, which is 
magna-sirgas from Bogota (3116), I have tried the magna-sirgas (3116) project, 
and wgs84 (4326) showing the same error.The version of qgis is 3.10.2-A 
Coruña.thank you very much for the help and I remain attentive

-- Humberto NFR
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[QGIS-it-user] Grass in processing

[Luca Puglisi]

Salve,

come accade spesso agli utenti Windows, all'aggiornamento di QGis con 
Osgeow chiamando gli algoritmi Grass, il programma non li trova. In 
passato sono riuscito ad indirizzare correttamente il caricamento degli 
strumenti Grass modificando il percorso ma ora, con 3.10.2-A Coruña 
trovo nelle opzioni di Processing il percorso della documentazione ma 
non quello per gli algoritmi. Qualcuno sa darmi indicazioni per risolvere?


Uso Windows 10

Grazie, un saluto a tutta la lista
Luca Puglisi
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[Qgis-user] error loading tiff layer

[Humberto Nel Florez Ramos]

 regards.
I could not load a layer in tiff format. The error that qgis shows is:

"No transform is available between Unknown CRS: ENGCRS [" PCS Name =
unnamed ", EDATUM [" "], CS [Cartesia ... and Unknown CRS: GEOGCRS ["
unknown ", DATUM [" unknown ", ELLIPSOID [" WGS 8 ... .
No coordinate operations are available between these two reference systems
".

The file has a reference system, which is magna-sirgas from Bogota (3116),
I have tried the magna-sirgas (3116) project, and wgs84 (4326) showing the
same error.
The version of qgis is 3.10.2-A Coruña.
thank you very much for the help and I remain attentive

[image: imagen.png]


-- 
Humberto NFR
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Re: [QGIS-it-user] Bug nell'algoritmo "Random points along line"/"Punti casuali lungo la linea"

[Totò]

Andrea Giudiceandrea wrote
> Se qualcuno volesse usare o testare l'algoritmo con la patch, può
> scaricarlo
> da
> https://github.com/agiudiceandrea/qgis_python_tools/blob/master/RandomPointsAlongLines.py

Buongiorno Andrea,
ho fatto il seguente test con esisto positivo (funziona alla grande)

1. ho copiato il tuo file .py e sostituito al vecchio (provato su master);
2. ho creato un nuovo strato lineare temporaneo;
3. ho lanciato algoritmo

ecco il log:

QGIS version: 3.11.0-Master
QGIS code revision: ee323eb5c1
Qt version: 5.11.2
GDAL version: 3.1.0dev
GEOS version: 3.8.0-CAPI-1.13.1 
PROJ version: Rel. 7.0.0, March 1st, 2020
Algoritmo in esecuzione...
In avvio l'algoritmo 'Punti casuali lungo la linea' …
Parametri in ingresso:
{ 'INPUT' :
'LineString?crs=EPSG:32632={cdfe83be-558b-4b60-a260-1c40b8487c0d}',
'MIN_DISTANCE' : 1000, 'OUTPUT' : 'TEMPORARY_OUTPUT', 'POINTS_NUMBER' : 100
}

Esecuzione completata in 0.33 secondi
Risultati:
{'OUTPUT': 'Punti_casuali_1559c099_ae61_4a30_93ab_fb0e8d421799'}

Caricamento layer
Algoritmo 'Punti casuali lungo la linea' terminato

grazie

Saluti



-
https://pigrecoinfinito.wordpress.com/
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Re: [QGIS-it-user] baco api di formattazione coordinate in DMS o cosa?

[Andrea Giudiceandrea]

Andrea Giudiceandrea wrote
> QgsCoordinateFormatter.formatY(35.50822371518,QgsCoordinateFormatter.FormatDegreesMinutesSeconds,3)

...per tre decimali.

Per due decimali, chiaramente:

QgsCoordinateFormatter.formatY(35.50822371518,QgsCoordinateFormatter.FormatDegreesMinutesSeconds,2)




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Re: [QGIS-it-user] baco api di formattazione coordinate in DMS o cosa?

[Andrea Giudiceandrea]

Ciao SC,
la funzione formatY è definita [1] come:

static QString formatY (double y, Format format, int precision=12,
FormatFlags flags=FlagDegreesUseStringSuffix)

quindi dovresti indicare prima il formato e poi la precisione:

QgsCoordinateFormatter.formatY(35.50822371518,QgsCoordinateFormatter.FormatDegreesMinutesSeconds,3)

A presto.

Andrea

[1] https://qgis.org/api/classQgsCoordinateFormatter.html



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[QGIS-it-user] Bug nell'algoritmo "Random points along line"/"Punti casuali lungo la linea"

[Andrea Giudiceandrea]

Salve,
recentemente ho riscontrato un malfunzionamento nell'algoritmo di processing
"Random points along line"/"Punti casuali lungo la linea".

Il bug era già stato segnalato [1] ma sembrava che fosse stato risolto e
quindi nessuno se ne stava più occupando.

Grazie ai test di Salvatore Fiandaca [2] si è potuto appurare che il bug è
ancora presente sia nella versione 3.10.2 che nell'attuale versione 3.11
master.

Ho proposto una semplice patch che dovrebbe risolvere il problema.

Se qualcuno volesse usare o testare l'algoritmo con la patch, può scaricarlo
da
https://github.com/agiudiceandrea/qgis_python_tools/blob/master/RandomPointsAlongLines.py

Nyall Dawson si è comunque interessato al problema e potrebbe nel futuro
proporre una patch più complessa per risolvere anche altri aspetti
problematici dell'algoritmo.

A presto.

Andrea


[1] https://github.com/qgis/QGIS/issues/33156
[2] https://www.facebook.com/groups/GisItalia/permalink/10158104649271385/



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Re: [Qgis-user] Problem with xyz tiles

[Christoph Jung]

Thank you for this advice, Alessandro. Now it works like a charm :)

Sincerely,
Christoph

> Am 30.01.2020 um 16:20 schrieb Alessandro Pasotti :
> 
> 
> 
> 
>> On Thu, Jan 30, 2020 at 1:43 PM Christoph Jung  wrote:
>> Hi Víctor,
>> 
>> Thank you for your advice. Yes, my tiles are in the opposite order in 
>> vertical direction. But only if I implement them via xyz tiles with a url 
>> like http://abc.def/{z}/{x}/{y}.png the tiles are in the wrong vertical 
>> order. Is there a possibility to adjust the values QGIS is using for the 
>> http parameters using an equation or something else?
> 
> Use "-y" for inverted Y
> 
> If I'm not wrong it's documented in the tooltip when you add/edit the URL.
> 
> Cheers
> 
> 
>  
>> 
>> Sincerely,
>> Christoph 
>> 
 Am 30.01.2020 um 10:06 schrieb Víctor Centella :
 
>>> 
>>> Hello Christoph,
>>> 
>>> I had a similar issue, but not using mbtiles but generating tiles XYZ as 
>>> files. I could solve it using the "Use inverted tile Y axis (TMS 
>>> convention)" option, but this option is not available in the "Generate 
>>> tiles XYZ (MBtiles)" tool, it is only in the "Generate tiles XYZ 
>>> (Directory)" tool.
>>> 
>>> 
>>> Regards,
>>> 
>>> Víctor
>>> 
>>> 
>>> 
 El 30/01/2020 a las 7:38, Christoph Jung escribió:
 Hello everyone,
 
 I have an mbtiles file with OSM-tiles. If I drag and drop this file into 
 QGIS, everything looks fine. Then I started a tomcat Server for providing 
 these tiles via url in my company and created a new connection for xyz 
 tiles in the QGIS browser. But the tiles are not on the right position. 
 And they are internally mixed too, i.e. the tiles are not in correct 
 vertical order in the map view. The settings of the xyz tiles connection 
 should be okay. Have had anybody a similar problem in the past? Is it 
 possible to get the GetMap-requests (or the similar name for xyz tiles), 
 QGIS is generating for the map view, logged or printed to the python 
 console?
 
 Sincerely,
 Christoph
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>>> -- 
>>> 
>>> Víctor Centella Fuster
>>> 
>>> Prodevelop
>>> http://www.prodevelop.es
>>> 
>>> 
>>> 
>>> Aviso legal:
>>> Este mensaje se dirige exclusivamente a su destinatario y puede contener 
>>> información privilegiada o confidencial. Si ha recibido este mensaje por 
>>> error, le rogamos que nos lo comunique inmediatamente por esta misma vía y 
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>>> De acuerdo con la nueva Ley de Servicios de la Sociedad de la Información y 
>>> Comercio Electrónico aprobada por el Parlamento Español y de lo establecido 
>>> en el Reglamento (UE) 2016/679 del Parlamento Europeo de Protección de 
>>> Datos de Carácter Personal, le comunicamos que su dirección de correo 
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>>> datos, mediante una respuesta a este e-mail. Asimismo, podrá dirigirse a la 
>>> Autoridad de Control competente para presentar la reclamación que considere 
>>> oportuna.
>>> 
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> 
> -- 
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> w3:   www.itopen.it
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