Re: [Qgis-user] Qgis low CPU and Memory load

[Matt Boyd]

I use multiproc / proc to speed things up in python instead of a for
loop, each step needs to be independent of the other steps for this to
work.
On an i7 with 4 cores I can process 8 layers at a time and hit 100% on
all of them. I haven't used this inside qgis yet but for the
relatively simple work I'm doing it works well.

Matt

On Sat, Apr 17, 2021 at 2:12 AM Wolfgang Meinolf
 wrote:
>
> Thanks for the excellent feedback and hints. First of all, my QGIS qork is 
> mainly with vector layers. Therefore unfortunately the OpenCL capabilities 
> don’t help. To my understanding this is mainly for accelerating heavy raster 
> calculations. Secondly and as already mentioned, my most urgent need is to 
> accelerate the execution of GRASS v.net.steiner and v.clean as part of my 
> toolbox processing scripts for a number of given route networks in separate 
> areas.
>
>
>
> However, on you feedback I searched a bit and found, that obviously  since 
> QGIS3 some parallelization seems to be supported. In the developers coockbook 
> here: 
> https://docs.qgis.org/testing/en/docs/pyqgis_developer_cookbook/tasks.html#task-from-a-processing-algorithm
>   I found some promising info including the link to here: 
> https://www.opengis.ch/2018/06/22/threads-in-pyqgis3/. I will spend some time 
> to modify my loop through my separate network areas to try, to start python 
> jobs from inside the loop, which are then collected at the end.
>
>
>
> Thanks again for your good ideas and have a good weekend
>
> Br
>
> Wolfgang
>
> -
>
>
>
> Hi,
>
>
>
> You can also activate the OpenCL option.  Some algorithms have been optimized 
> (I believe it’s still experimental).  If you have a compatible  OpenCL video 
> card, it will run these on the card.  If not, it can probably run on 
> compatible CPUs.
>
>
>
> https://www.itopen.it/opencl-acceleration-now-available-in-qgis/
>
>
>
> I find it’s worth testing equivalent algorithms from different sources in the 
> Processing plugin is worth the trouble.  Some Saga algorithm are faster.  
> Merging vector lines, for example, could take a long time using the QGIS 
> algorithm (talking hours) and was much faster (a few minutes) using the Saga 
> version of the tool.  I also found that some algorithms are much faster to 
> handle when the files are not open beforehand in the layer manager.  For 
> example, the Processing plugin can sometimes grab the needed files directly 
> on the hard drive rather than picking one that is already open in the layer 
> manager. Looking at the processor, memory and disk usage can also help 
> identify bottle necks in the hardware.
>
> Nicolas Cadieux
>
> https://gitlab.com/njacadieux
>
>
>
> Le 16 avr. 2021 à 03:34, Francesco Pelullo  a écrit :
>
> 
>
>
>
> Il ven 16 apr 2021, 02:56 Stewart Holt  ha scritto:
>
>  Parallelizing script execution is complex and I doubt that it is currently 
> done in QGIS.
>
>
>
> That's true.
>
>
>
> In Settings / Options / Rendering / there's a checkbox for render layers in 
> parallel using as many CPU cores you want, but It Is enabled by default so I 
> suppose that there are no others settings that could make QGIS more 
> aggressive in CPU usage.
>
>
>
> Regards
>
>
>
>
>
>
>
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Re: [Qgis-user] Help! QGIS crashed and has deleted my QGZ file

[Nicolas Cadieux]

Hi

If you have Windows 10 and have activated "Back up using File History" 
(Setting/Update and Security/Backup) you may have a copy of the 
file.  If your files disappeared for no reasons, I would seriously scan 
your hard drive in case you are seeing indications of a drive failier.


Good Luck

Nicolas

On 2021-04-19 8:56 a.m., j...@john-firth-editor.co.uk wrote:


I’m using QGIS 3.16.0 on Windows 10, standalone PC. I have taken some 
training, but am a pretty inexpert user. The map that I’ve spent 
several months developing (for a book I’m writing) crashed on 
Saturday, and when I tried to load it just now it is greyed out in the 
Open Recent list (with an exclamation mark next to it) and File 
Explorer no longer finds it on my hard disk.


I attempted to do what your website advised (downloaded DeBug View, 
which did not appear to run on my computer). When the file crashed, I 
had just added a couple of entries to an attribute table (it’s not a 
large one, though there are others in the file). I’ve no doubt someone 
more expert than I am could tell me how to extract a crash report, if 
that would be helpful.


Is there any chance of saving my map?



John Firth

Advanced Professional Member of the Chartered Institute of Editing and 
Proofreading


On 1 March 2020 a Royal Charter was given to the Society for Editors 
and Proofreaders (SfEP), which is now the *Chartered Institute of 
Editing and Proofreading*.


I would like to keep your contact details in my records, so I can stay 
in touch. If you are happy for me to do this, please reply to this 
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Re: [Qgis-user] How to create / copy and paste annotations

[chris hermansen]

Azzurra and list,

On Mon, Apr 19, 2021 at 11:28 AM Azzurra Lentini 
wrote:

> Hi to all,
> I must draw some annotations in my project qgz (in the canvas): letter +
> number and a frame around.
> I did this with "text annotations", but it is not so comfortable because I
> must make several changes to create the label (and even after this I can't
> obtain the label I would like) and I don't find the way to copy and paste
> these annotations  (in order to avoid to repeat the modifications for every
> label).
> Is it in Qgis another way to make annotations and to copy and paste?
>
>
I've used a point layer with attributes I can combine by labeling rules, or
even with a text field that can contain the text for annotating.  The
labeling ability in QGIS is quite flexible.

In case it's not clear, then, you create a label by 1) placing a point and
2) entering the attribute(s) in the related field(s).  You can at some
point use Properties > Labels to show the labels (and you can turn off the
display of the points).


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C'est ma façon de parler.
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[Qgis-user] How to create / copy and paste annotations

[Azzurra Lentini]

Hi to all,
I must draw some annotations in my project qgz (in the canvas): letter +
number and a frame around.
I did this with "text annotations", but it is not so comfortable because I
must make several changes to create the label (and even after this I can't
obtain the label I would like) and I don't find the way to copy and paste
these annotations  (in order to avoid to repeat the modifications for every
label).
Is it in Qgis another way to make annotations and to copy and paste?

Many thanks, Azzurra



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Consultant Environmental Risk Prevention and Hydrogeology
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++
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++
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Re: [Qgis-user] Help! QGIS crashed and has deleted my QGZ file

[john]

Thanks for quick reply, Kirk. I'm going to look into restoring from the
back-up before Saturday (I need to make a living for the rest of today), but
what prompted my concern was that the project file (QGZ) is not found by
File Explorer, either in the folder I used to store it in or in the Recycle
Bin. There's no previously saved version, no .TMP version (I don't know
whether QGIS sets these up); nothing. The explanation mark that QGIS placed
next to its title in the Open Recent line would probably tell me more, if
the line weren't greyed-out.

 

A number of the other files are still present (including, interestingly, the
shapefile that I modified just before the crash); but I should probably have
kept a separate list of these somewhere as I can't tell from looking down
the list whether they are all present. (As usual, burnt hand teaches best.)

 

So, having calmed down a bit, I should be able to recover my work with only
a day or so lost (unless I find that the backup won't restore properly). But
I am fairly concerned that a large file has apparently disappeared as a
result of a crash.



John Firth



On 1 March 2020 a Royal Charter was given to the Society for Editors and
Proofreaders (SfEP), which is now the Chartered Institute of Editing and
Proofreading.

I store in my records the contact details of everyone who writes to me, so I
can stay in touch. If you do not want me to do this, please reply to this
email, copying the following text into your reply: 'Please do not record my
name and email address, or write to me unless I write to you first'.

 

From: Kirk Schmidt  
Sent: 19 April 2021 14:16
To: qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] Help! QGIS crashed and has deleted my QGZ file

 

Hi John:

I am sorry to hear about your crash.  It is important to note that QGIS
provides a means of querying, updating, analysing and displaying data that
is stored outside of the software (in a variety of formats).  SO, I would
suggest looking for the actual spatial files(s) that you were editing when
it crashed.  I assume they still exist, however, depending on the data
format, you probably would have lost the attributes you were editing at the
time of the crash. 

The QGIS project file may also have been corrupted at the time of the crash.
You may have to use a backup to restore your last saved version.

I hope this helps

Kirk Schmidt  

On 4/19/2021 9:56 AM, j...@john-firth-editor.co.uk
  wrote:

I'm using QGIS 3.16.0 on Windows 10, standalone PC. I have taken some
training, but am a pretty inexpert user. The map that I've spent several
months developing (for a book I'm writing) crashed on Saturday, and when I
tried to load it just now it is greyed out in the Open Recent list (with an
exclamation mark next to it) and File Explorer no longer finds it on my hard
disk.

 

I attempted to do what your website advised (downloaded DeBug View, which
did not appear to run on my computer). When the file crashed, I had just
added a couple of entries to an attribute table (it's not a large one,
though there are others in the file). I've no doubt someone more expert than
I am could tell me how to extract a crash report, if that would be helpful.

 

Is there any chance of saving my map?



John Firth



On 1 March 2020 a Royal Charter was given to the Society for Editors and
Proofreaders (SfEP), which is now the Chartered Institute of Editing and
Proofreading.

I would like to keep your contact details in my records, so I can stay in
touch. If you are happy for me to do this, please reply to this email,
copying the following text into your reply: 'I am happy for John Firth to
record my name and email address, to keep me informed about his services and
availability'.

 

 


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Re: [Qgis-user] QGIS-3 single line/point layers from hand-written co-ordinates

[Kirk Schmidt]

Hi John:

Yes, life is too short to waste time.  I would add the lat/long into a 
spreadsheet or simple ascii text file.  This way, you can double check 
your entries and once you are ready, you can bring them into QGIS as a 
*.txt or *.csv file.


A simple text format would be :

1,45.3741, -62.1548

where 1 is the point id and the next is the longitude and latitude.  
These values are separated by a comma, however a semi colon or tab would 
work as well.  You can also reverse the lat/long if it is easier for you.


Instructions on how to import the file and convert it to a spatila layer 
are found at: (I know, another tutorial)


https://www.qgistutorials.com/en/docs/3/importing_spreadsheets_csv.html

If your coordinates are in degrees/minutes, you can use them as well.  
Reach out to me and I can give you the correct syntax if you need it.


Kirk Schmidt

On 4/19/2021 11:36 AM, John Moyle wrote:
I am a retired Chartered Engineer, Physician and Anaesthetist!. In 
retirement I have completed a PhD "The Maintenance of the Victorian 
Submarine Telegraph Cable System".  I want to correlate N Atlantic 
cable interruptions with geological events of that era. I have found a 
raster-file of the sea bed and a shape file of the tectonic plate 
boundaries. Fantastic! Now I want to make separate point or line 
layers for each interruption, volcano, earthquake and landslide.  I 
have all the data in lat/long, hand written in a notebook whilst 
searching the archives at the National Maritime Museum.
My problem is that all QGIS-3 courses take  many hours turning one 
into a town and country planner before the simple layers I want to 
make!  At 75, life is too short. I want to input the co-ordinates, by 
hand, layer by layer. Can anyone give me step by step instructions please.

Thank you
John Moyle



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Re: [Qgis-user] QGIS-3 single line/point layers from hand-written co-ordinates

[info]

  
  
Hi John,
Happy retirement...
Simply create a text file with extension .csv and formatted as
  below, for example:
First line should be something like the following:
  Longitude,Latitude,point,attribute_1,attribute_2
replace "attribute_x" with proper name

Then on each following line enter your hand written coordinate:
  -23.123, 33.123, 1, volcano, volcano_name
  ...
When done save and import into QGIS using:
  Layer -> Add Layer... -> Add Delimited Text Layer...
Make sure to correctly fill the Geometry Definition section.
  Normally, Lat & Lon should already be defined correctly. But
  you have to define "Geometry CRS"
  Hopefully all your points are in the same CRS? Otherwise, create
  on csv file per CRS. Assuming you know in which coordinate system
  your points are!

Then you can symbolise the points using one of the attribute
  columns.
Hope this helps.
Regards,
  Benoit de Cabissole



On 19/04/2021 16:36, John Moyle wrote:


  
  
I
am a retired Chartered Engineer, Physician and
Anaesthetist!. In retirement I have completed a PhD "The
Maintenance of the Victorian Submarine Telegraph Cable
System".  I want to correlate N Atlantic cable interruptions
with geological events of that era. I have found a
raster-file of the sea bed and a shape file of the tectonic
plate boundaries. Fantastic! Now I want to make separate
point or line layers for each interruption, volcano,
earthquake and landslide.  I have all the data in
lat/long, hand written in a notebook whilst searching the
archives at the National Maritime Museum.
  My
problem is that all QGIS-3 courses take  many hours turning
one into a town and country planner before the simple layers
I want to make!  At 75, life is too short. I want to input
the co-ordinates, by hand, layer by layer. Can anyone give
me step by step instructions please.
  Thank
you

John Moyle


  

  
  

  

  
  
  
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[Qgis-user] QGIS-3 single line/point layers from hand-written co-ordinates

[John Moyle]

I am a retired Chartered Engineer, Physician and Anaesthetist!. In
retirement I have completed a PhD "The Maintenance of the Victorian
Submarine Telegraph Cable System".  I want to correlate N Atlantic cable
interruptions with geological events of that era. I have found a
raster-file of the sea bed and a shape file of the tectonic plate
boundaries. Fantastic! Now I want to make separate point or line layers for
each interruption, volcano, earthquake and landslide.  I have all the data
in lat/long, hand written in a notebook whilst searching the archives at
the National Maritime Museum.
My problem is that all QGIS-3 courses take  many hours turning one into a
town and country planner before the simple layers I want to make!  At 75,
life is too short. I want to input the co-ordinates, by hand, layer by
layer. Can anyone give me step by step instructions please.
Thank you
John Moyle
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Re: [Qgis-user] Cannot add cloud optimised GeoTIFF (COG) as raster layer

[Andrea Giudiceandrea]

jratike80 wrote
> is there some use case where the proxy that is
> configured in general settings should not be applied?

I can't think of any use case.
Instead it seems to me that this is a recurring issue for users not aware of
the GDAL specific proxy settings and it seems to me those settings are not
even mentioned in the QGIS user manual [1].

Regards.

Andrea

[1] e.g. in
https://docs.qgis.org/3.16/en/docs/user_manual/introduction/qgis_configuration.html#network-settings



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Re: [Qgis-user] Help! QGIS crashed and has deleted my QGZ file

[Kirk Schmidt]

Hi John:

I am sorry to hear about your crash.  It is important to note that QGIS 
provides a means of querying, updating, analysing and displaying data 
that is stored outside of the software (in a variety of formats).  SO, I 
would suggest looking for the actual spatial files(s) that you were 
editing when it crashed.  I assume they still exist, however, depending 
on the data format, you probably would have lost the attributes you were 
editing at the time of the crash.


The QGIS project file may also have been corrupted at the time of the 
crash.  You may have to use a backup to restore your last saved version.


I hope this helps

Kirk Schmidt

On 4/19/2021 9:56 AM, j...@john-firth-editor.co.uk wrote:


I’m using QGIS 3.16.0 on Windows 10, standalone PC. I have taken some 
training, but am a pretty inexpert user. The map that I’ve spent 
several months developing (for a book I’m writing) crashed on 
Saturday, and when I tried to load it just now it is greyed out in the 
Open Recent list (with an exclamation mark next to it) and File 
Explorer no longer finds it on my hard disk.


I attempted to do what your website advised (downloaded DeBug View, 
which did not appear to run on my computer). When the file crashed, I 
had just added a couple of entries to an attribute table (it’s not a 
large one, though there are others in the file). I’ve no doubt someone 
more expert than I am could tell me how to extract a crash report, if 
that would be helpful.


Is there any chance of saving my map?



John Firth

Advanced Professional Member of the Chartered Institute of Editing and 
Proofreading


On 1 March 2020 a Royal Charter was given to the Society for Editors 
and Proofreaders (SfEP), which is now the *Chartered Institute of 
Editing and Proofreading*.


I would like to keep your contact details in my records, so I can stay 
in touch. If you are happy for me to do this, please reply to this 
email, copying the following text into your reply: ‘I am happy for 
John Firth to record my name and email address, to keep me informed 
about his services and availability’.





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RR # 1
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Tel (902) 922.3607
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[Qgis-user] Help! QGIS crashed and has deleted my QGZ file

[john]

I'm using QGIS 3.16.0 on Windows 10, standalone PC. I have taken some
training, but am a pretty inexpert user. The map that I've spent several
months developing (for a book I'm writing) crashed on Saturday, and when I
tried to load it just now it is greyed out in the Open Recent list (with an
exclamation mark next to it) and File Explorer no longer finds it on my hard
disk.

 

I attempted to do what your website advised (downloaded DeBug View, which
did not appear to run on my computer). When the file crashed, I had just
added a couple of entries to an attribute table (it's not a large one,
though there are others in the file). I've no doubt someone more expert than
I am could tell me how to extract a crash report, if that would be helpful.

 

Is there any chance of saving my map?



John Firth



On 1 March 2020 a Royal Charter was given to the Society for Editors and
Proofreaders (SfEP), which is now the Chartered Institute of Editing and
Proofreading.

I would like to keep your contact details in my records, so I can stay in
touch. If you are happy for me to do this, please reply to this email,
copying the following text into your reply: 'I am happy for John Firth to
record my name and email address, to keep me informed about his services and
availability'.

 



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[Qgis-user] Overlapping SVG Symbols

[APM]

Dear List,


I like to create a map with gpx tracks. This tracks I imported as a 
vector layer.


Every track has a SVG Symbol which are defined in the menu Symbole > 
Line > Marker Line > Marker > SVG Marker


Works fine so far.

But at common points of the tracks,  the SVG symbols overlap each other 
and are not visible correctly.



I played a bit with 'Marker line" and 'Intervall', but I have no success.


I'm not an native English speaker, but I hope I pointed out my problem.


Thank you for every hint!


Kind regards


Piet


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Re: [Qgis-user] Cannot add cloud optimised GeoTIFF (COG) as raster layer

[jratike80]

Hi Andrea,

Setting the GDAL_HTTP_PROXY env variable solved my problem. Should I file a
ticket about this or is there some use case where the proxy that is
configured in general settings should not be applied?

-Jukka Rahkonen-



Andrea Giudiceandrea wrote
> jcabieces wrote
>> It works for me with current QGIS master if I paste this exact url in URI
>> with HTTP/HTTPS/FTP
>> type : http://latuviitta.kapsi.fi/data/dem10m/dem10.tif
> 
> Hi,
> I can also add and display the raster layer in QGIS adding it using Data
> Source Manager | Raster as:
> 
> Source Type: Protocol: HTTP(S)...
> URI: http://latuviitta.kapsi.fi/data/dem10m/dem10.tif
> 
> OR
> 
> Source Type: File
> Raster dataset(s):
> /vsicurl/http://latuviitta.kapsi.fi/data/dem10m/dem10.tif
> 
> 
> Anyway, if the problem is the presence of a proxy, maybe the relevant
> GDAL_*PROXY env vars should be set.
> See
> https://gdal.org/user/virtual_file_systems.html#vsicurl-http-https-ftp-files-random-access
> and
> https://gdal.org/user/configoptions.html#list-of-configuration-options-and-where-they-apply
> 
> Regards.
> 
> Andrea
> 
> 
> 
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