[Qgis-user] Huge Raster calculator

[Nicolas Cadieux]

Hi,

Is anyone aware if the Qgis raster calculator will be able to deal with very 
large rasters in the near future? Any plans on implementing a fix soon?  If so, 
I can help in testing as I have multiple large raster sets ready to go.

For now, I am using gdal call but that is not very flexible when it comes so 
dealing with   rasters of different sizes and posting.
Cheers!

Nicolas
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Re: [Qgis-user] QGIS Meeting #20 : 20-25 February 2018, Madeira

[Tim Sutton]

Hi

Yes as per my original response to you:

> You will be most welcome to join. Just understand that the event is a
‘hackfest’ mainly aimed at polishing and improving the next release of
QGIS. We generally have no formal agenda and participants generally arrive,
self organise and work on whatever they are interested in - bug fixing,
testing, writing docs, coding new features etc. There are sometimes also ad
hoc presentations about new features being worked on or interesting things
people are doing. If this sounds like something you will enjoy and derive
benefit from then we would love to have you join us. *To register, simply
add a row for yourself to the wiki page using the link you quoted below.*


https://github.com/qgis/QGIS/wiki/DeveloperMeetingMadeira2018

regards

Tim

On Tue, Nov 14, 2017 at 7:39 PM, Luigi Pirelli  wrote:

> Hi Marian
>
> IMHO To sign to next hackmeeting, just sign into https://github.com/qgis/
> QGIS/wiki/DeveloperMeetingMadeira2018 and flight to Madeira. If you don't
> need travel support, don't file any record in https://docs.google.com/
> forms/d/e/1FAIpQLSea25C7UMQecQgEIIpZGHdwpqqFy6ZTEfOk64qcA0tI
> 4aZZFA/viewform
>
> about letters, I leave the answer to Lene or psc
>
> regards
>
> Luigi Pirelli
>
> 
> **
> * Boundless QGIS Support/Development: lpirelli AT boundlessgeo DOT com
> * 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
> 
> **
>
> On 14 November 2017 at 15:40, Tudorache, Marian <
> marian.tudora...@navcanada.ca> wrote:
>
>> Hello everyone,
>>
>>
>>
>> Last week, I have sent an email to Tim Sutton and another one to Lene
>> Fischer about this event.
>>
>> I am really interesting in participating.
>>
>>
>>
>> In my preliminary discussions with my manager, he is willing to seek
>> money from the company to sponsor me. So basically I do not need any
>> funding support.
>>
>> I tried to use your form https://docs.google.com/forms/
>> d/e/1FAIpQLSea25C7UMQecQgEIIpZGHdwpqqFy6ZTEfOk64qcA0tI4aZZFA/viewform
>> but it does not allow to introduce 0 Euro.
>>
>> It seems the form is for who applies for support.
>>
>>
>>
>> So I would really appreciate a firm response from organizers if my
>> participation is accepted or not.
>>
>> In case you accept my participation I would need a letter from you with
>> your agreement eventually the program of the event.
>>
>>
>>
>> Thank you and I am looking forward to see you there.
>>
>>
>>
>> CAATS Engineering Data Developer
>>
>> NAV CANADA
>>
>> 280 Hunt Club Road
>>
>> Ottawa (Ontario)  K1V 1C1
>> 
>>
>> (613) 248-6558
>>
>> tudo...@navcanada.ca
>>
>>
>>
>> *From:* Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] *On Behalf
>> Of *Tim Sutton
>> *Sent:* October-29-17 6:08 PM
>> *To:* QGIS Developer; QGIS Users; Lene Fischer
>> *Cc:* Sara Isabel Correia Freitas; Duarte Costa
>> *Subject:* [Qgis-user] QGIS Meeting #20 : 20-25 February 2018, Madeira
>>
>>
>>
>> Hi All
>>
>>
>>
>> We have a confirmed venue for the next QGIS get together - it is in
>> Madeira from the 20-25 February 2018. If you plan on attending please head
>> over to the wiki page and register your intention to be there:
>>
>>
>>
>> https://github.com/qgis/QGIS/wiki/DeveloperMeetingMadeira2018
>>
>>
>>
>> Please also note that this time we are going to try to be a little more
>> organised for helping newcomers, so I have added sections to the wiki page
>> for ‘Mentor streams’ - I have nominally added 4 streams but if you would
>> like to host more please add a new section to the wiki page. If you are
>> interested in attending one of the streams, please add your name to the
>> appropriate section.
>>
>>
>>
>> Lene will no doubt provide you with more details (via the wiki)  as we
>> get closer to the event as will Duarte and Sara (our local organisers in
>> Madeira).
>>
>>
>>
>> Another important thing to note is that the cost of attending will be
>> higher than usual given the more removed location and that we do not have
>> very cheap accommodation available. If you intend on requesting travel
>> assistance for the event, please fill out our new form
>>  as soon as possible. Also be
>> aware that funds are limited so we may not be able to cover everyone’s
>> costs or all costs completely - applications will be taken on merit with
>> priority given to active contributors to the QGIS project.
>>
>>
>>
>> Looking forward to seeing you all in Madeira!
>>
>>
>>
>> Regards
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>

Re: [Qgis-user] QGIS Meeting #20 : 20-25 February 2018, Madeira

[Luigi Pirelli]

Hi Marian

IMHO To sign to next hackmeeting, just sign into
https://github.com/qgis/QGIS/wiki/DeveloperMeetingMadeira2018 and flight to
Madeira. If you don't need travel support, don't file any record in
https://docs.google.com/forms/d/e/1FAIpQLSea25C7UMQecQgEIIpZGHdw
pqqFy6ZTEfOk64qcA0tI4aZZFA/viewform

about letters, I leave the answer to Lene or psc

regards

Luigi Pirelli

**
* Boundless QGIS Support/Development: lpirelli AT boundlessgeo DOT com
* 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
**

On 14 November 2017 at 15:40, Tudorache, Marian <
marian.tudora...@navcanada.ca> wrote:

> Hello everyone,
>
>
>
> Last week, I have sent an email to Tim Sutton and another one to Lene
> Fischer about this event.
>
> I am really interesting in participating.
>
>
>
> In my preliminary discussions with my manager, he is willing to seek money
> from the company to sponsor me. So basically I do not need any funding
> support.
>
> I tried to use your form https://docs.google.com/forms/d/e/
> 1FAIpQLSea25C7UMQecQgEIIpZGHdwpqqFy6ZTEfOk64qcA0tI4aZZFA/viewform but it
> does not allow to introduce 0 Euro.
>
> It seems the form is for who applies for support.
>
>
>
> So I would really appreciate a firm response from organizers if my
> participation is accepted or not.
>
> In case you accept my participation I would need a letter from you with
> your agreement eventually the program of the event.
>
>
>
> Thank you and I am looking forward to see you there.
>
>
>
> CAATS Engineering Data Developer
>
> NAV CANADA
>
> 280 Hunt Club Road
>
> Ottawa (Ontario)  K1V 1C1
>
> (613) 248-6558
>
> tudo...@navcanada.ca
>
>
>
> *From:* Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] *On Behalf
> Of *Tim Sutton
> *Sent:* October-29-17 6:08 PM
> *To:* QGIS Developer; QGIS Users; Lene Fischer
> *Cc:* Sara Isabel Correia Freitas; Duarte Costa
> *Subject:* [Qgis-user] QGIS Meeting #20 : 20-25 February 2018, Madeira
>
>
>
> Hi All
>
>
>
> We have a confirmed venue for the next QGIS get together - it is in
> Madeira from the 20-25 February 2018. If you plan on attending please head
> over to the wiki page and register your intention to be there:
>
>
>
> https://github.com/qgis/QGIS/wiki/DeveloperMeetingMadeira2018
>
>
>
> Please also note that this time we are going to try to be a little more
> organised for helping newcomers, so I have added sections to the wiki page
> for ‘Mentor streams’ - I have nominally added 4 streams but if you would
> like to host more please add a new section to the wiki page. If you are
> interested in attending one of the streams, please add your name to the
> appropriate section.
>
>
>
> Lene will no doubt provide you with more details (via the wiki)  as we get
> closer to the event as will Duarte and Sara (our local organisers in
> Madeira).
>
>
>
> Another important thing to note is that the cost of attending will be
> higher than usual given the more removed location and that we do not have
> very cheap accommodation available. If you intend on requesting travel
> assistance for the event, please fill out our new form
>  as soon as possible. Also be
> aware that funds are limited so we may not be able to cover everyone’s
> costs or all costs completely - applications will be taken on merit with
> priority given to active contributors to the QGIS project.
>
>
>
> Looking forward to seeing you all in Madeira!
>
>
>
> Regards
>
>
>
>
>
>
>
>
>
>
>
>
> ---
>
>
>
> *Tim Sutton*
>
> QGIS Project Steering Committee Chair
>
> t...@qgis.org
>
>
>
>
>
>
>
> --
>
> This electronic message, as well as any transmitted files included in the
> electronic message, may contain privileged or confidential information and
> is intended solely for the use of the individual(s) or entity to which it
> is addressed. If you have received this electronic message in error please
> notify the sender immediately and delete the electronic message. Any
> unauthorized copying, disclosure or distribution of the electronic message
> is strictly forbidden. NAV CANADA accepts no liability for any damage
> caused by any virus and/or other malicious code transmitted by this
> electronic communication.
>
> Le présent message électronique et tout fichier qui peut y être joint
> peuvent contenir des renseignements privilégiés ou confidentiels destinés à
> l’usage exclusif des personnes ou des organismes à qui ils s’adressent. Si
> vous avez reçu ce message électronique par erreur, veuillez en informer
> l’expéditeur immédiatement et supprimez le. Toute reprodu

[Qgis-user] Puzzling error messages when using Processing in a Python script

[Stephen Bosch]

Hi everybody,

I've written a long Python script to batch-process and compute a series of
raster layers. The script is written to run entirely outside of QGIS, which
I accomplish by importing the required  modules.

I use the processing toolbox for a number of operations, for example:

processing.runalg("grass7:r.buffer",input_layer,mg_buf,1,False,clipped_extent,0,output_layer)

For some layers, I get error messages like this:

ERROR 1: /home/user/Output/masks/mgrid_mask_buffer.tif, band 1: Failed to
compute statistics, no valid pixels found in sampling.

I used a debugger and went down as many levels as it would let me. The
error occurs when QgsRasterLayer(uri, name) is called in
/usr/share/qgis/python/plugins/processing/tools/dataobjects.py:266.

The layer in question is an eight-bit unsigned integer GeoTIFF with pixels
that are either 1 or NoData (NoData value is 255).

One might think that the GeoTIFF is the problem. However, when I open the
very same file in QGIS, I get no such error. This is true even if I use the
Python console within QGIS, set the variables in question, and run the
command
processing.runalg("grass7:r.buffer",input_layer,mg_buf,1,False,clipped_extent,0,output_layer)

Overall, my experience with the Processing toolbox has been frustrating.
It's not that I expect things to work perfectly, I understand that
open-source software is a work in progress and supporting a great variety
of external libraries and third-party software such as GDAL, GRASS and SAGA
in a unified way is no easy task.

But it is a mistake to obfuscate or block error messages. These are
essential for troubleshooting. I've invested days of development time
hunting for bugs that result in part from silent failures that result in
later errors that are totally misleading. Had the original error been
presented unadulterated right at the moment when it occurred, the cause
could have been resolved in a few minutes.

(My impression that, in an effort to make QGIS "user-friendly" and avoid
confusing beginners and laypeople, aspects critical to a professional are
hidden. At the very least it should be a simple matter to turn such
functionality on.)

I understand that the bulk of development effort is going into QGIS 3. Have
these aspects been considered? I'm referring specifically to code
transparency. QGIS really should pass on error messages originating from an
external module, tell the user in which module the error occurred, and
provide both the command that was issued and the output returned (I know
that the log messages panel already does this to some extent, but why
doesn't processing.runalg, for example?)

Having said all that, I do appreciate all the development effort that has
gone and is going into QGIS. Thank you.

Kind regards

Stephen Bosch
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Re: [Qgis-user] QGIS Meeting #20 : 20-25 February 2018, Madeira

[Tudorache, Marian]

Hello everyone,

Last week, I have sent an email to Tim Sutton and another one to Lene Fischer 
about this event.
I am really interesting in participating.

In my preliminary discussions with my manager, he is willing to seek money from 
the company to sponsor me. So basically I do not need any funding support.
I tried to use your form 
https://docs.google.com/forms/d/e/1FAIpQLSea25C7UMQecQgEIIpZGHdwpqqFy6ZTEfOk64qcA0tI4aZZFA/viewform
 but it does not allow to introduce 0 Euro.
It seems the form is for who applies for support.

So I would really appreciate a firm response from organizers if my 
participation is accepted or not.
In case you accept my participation I would need a letter from you with your 
agreement eventually the program of the event.

Thank you and I am looking forward to see you there.

CAATS Engineering Data Developer
NAV CANADA
280 Hunt Club Road
Ottawa (Ontario)  K1V 1C1
(613) 248-6558
tudo...@navcanada.ca

From: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] On Behalf Of Tim 
Sutton
Sent: October-29-17 6:08 PM
To: QGIS Developer; QGIS Users; Lene Fischer
Cc: Sara Isabel Correia Freitas; Duarte Costa
Subject: [Qgis-user] QGIS Meeting #20 : 20-25 February 2018, Madeira

Hi All

We have a confirmed venue for the next QGIS get together - it is in Madeira 
from the 20-25 February 2018. If you plan on attending please head over to the 
wiki page and register your intention to be there:

https://github.com/qgis/QGIS/wiki/DeveloperMeetingMadeira2018

Please also note that this time we are going to try to be a little more 
organised for helping newcomers, so I have added sections to the wiki page for 
‘Mentor streams’ - I have nominally added 4 streams but if you would like to 
host more please add a new section to the wiki page. If you are interested in 
attending one of the streams, please add your name to the appropriate section.

Lene will no doubt provide you with more details (via the wiki)  as we get 
closer to the event as will Duarte and Sara (our local organisers in Madeira).

Another important thing to note is that the cost of attending will be higher 
than usual given the more removed location and that we do not have very cheap 
accommodation available. If you intend on requesting travel assistance for the 
event, please fill out our new form as 
soon as possible. Also be aware that funds are limited so we may not be able to 
cover everyone’s costs or all costs completely - applications will be taken on 
merit with priority given to active contributors to the QGIS project.

Looking forward to seeing you all in Madeira!

Regards



 [cid:image001.png@01D35D2C.A8C36C00]



---

Tim Sutton
QGIS Project Steering Committee Chair
t...@qgis.org







This electronic message, as well as any transmitted files included in the 
electronic message, may contain privileged or confidential information and is 
intended solely for the use of the individual(s) or entity to which it is 
addressed. If you have received this electronic message in error please notify 
the sender immediately and delete the electronic message. Any unauthorized 
copying, disclosure or distribution of the electronic message is strictly 
forbidden. NAV CANADA accepts no liability for any damage caused by any virus 
and/or other malicious code transmitted by this electronic communication.

Le présent message électronique et tout fichier qui peut y être joint peuvent 
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du présent message électronique est strictement interdite. NAV CANADA n’assume 
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[Qgis-user] 7th QGIS UK SCottish user group - live streaming link

[McDonaldR]

Hi List

Here is the link to the live stream of the QGIS UK user group meeting in 
Edinburgh on Thursday.

https://www.youtube.com/watch?v=aWfg_ptdd7w

Videos of the individual talks will be available after the event.

Supported and sponsored by thinkWhere, Ordnance Survey, Cawdor Forestry, EDINA 
(venue), WRLD3D, Angus Council, Registers of Scotland, Product Forge 
(streaming), OSGeo:UK (finance)

Enjoy!

Ross


Ross McDonald | GIS Data Coordinator | Angus Council, People, IT | Angus House, 
Orchardbank Business Park, Sylvie Way, Forfar DD8 1AT | t: 01307 476419


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content may be intercepted. Angus Council does not accept any liability for any 
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or any attachment.
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