[Qgis-user] How to calculate the visible area of a viewshed?

[david cebrian via QGIS-User]

Good morning guys,

I need to calculate the visible area of a viewshed in order to do some 
statistics for a paper. However, I can't find the way to do it. Any help would 
be highly appreciated.

Many thanks.

All the best,

David
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Re: [Qgis-user] Technical specifications

[Sebastian Gutwein via QGIS-User]

Hello,
As it was not clear exactly what the needs of the department were I wanted
to offer an alternative perspective.
I have a small planning and design firm and we utilize QGIS healily on all
of our computers. I also teach GIS at a local masters program in planning.
While I agree with the specs put forward by the other respondents if you
are engaging in large geoprocessing tasks or if you want to make sure that
the computer you purchase is somewhat future proof. However, my students
and I do an amazing amount of processing and map creation on much less. I
have 16 GB of ram on my 6 year old windows machine and with the right
optimizations and able to run state wide geoprocessing tasks (I imagine you
could even have less RAM on linux). Some of my students this year somehow
ended up with 8 GB of ram on windows and if they are careful about the
number of programs they have open can easily run town scale GIS processing.

On Fri, Jun 2, 2023 at 1:35 PM KEITA Mamady kobélé via QGIS-User <
qgis-user@lists.osgeo.org> wrote:

> Thanks to all for these useful tips and suggestions.
> The beneficiary service has a limited GIS Capability and we are preparing
> a training program as well.
> The internet is not that strong, so giving priority to desktop softwares.
> A cloud will be USED mainly for storage purpose, not really for WMS.
>
> Many thanks,
> Mamady
>
> On Fri, Jun 2, 2023, 11:39 AM Richard McDonnell 
> wrote:
>
>> Hi All,
>> I would like to just throw my two cents in on this.
>> If Raster processing is envisaged, push it out to 32 minimum 64
>> recommended and 128 if you can stretch.
>> As for Processors, you need as many Threads as you can afford, with a
>> good base clock.
>> I would agree with the use of SSD I would also recommend the use of a
>> good PCI/NVME drive for boot, operating system and software, but also a
>> second Solid State drive for storage of data you are working on. It's best
>> not to be processing over a network, if at all possible.
>> Two decent screens are a must and I agree that a good Mouse and Keyboard
>> are almost always overlooked.
>> In relation to Operating System, Its personal preference. Both Linux and
>> Windows are stable, with varying degrees of involvement.
>> If you go down the windows operating system route, I would advise using
>> the OSGeo4W installer to install everything. It keeps everything working
>> well in one environment, installing all dependencies. It even making
>> running GDAL or Python commands from Command line easier as it has its own
>> OsGeo4w Shell. Updating and installing additional tools and library's is
>> also a breeze. BIG SHOUT OUT TO THE DEVS!!!
>> I hope that helps!!
>> Kind Regards,
>>
>> Richard.
>>
>>
>>
>>
>>
>> ——
>> Richard McDonnell MSc GIS, FME Certified Professional
>> FRM Data Management
>>
>> ——
>> Oifig na nOibreacha Poiblí
>> Office of Public Works
>>
>> Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36
>> Jonathan Swift Street, Trim, Co Meath, C15 NX36
>> ——
>> M +353 87 688 5964   T +353 46 942 2409
>> https://gov.ie/opw
>>
>> ——
>> To send me files larger than 30MB, please use the link below
>> https://filetransfer.opw.ie/filedrop/richard.mcdonn...@opw.ie
>>
>> Email Disclaimer:
>> https://www.gov.ie/en/organisation-information/439daf-email-disclaimer/
>>
>>
>>
>> ——
>> Richard McDonnell MSc GIS, FME Certified Professional
>> FRM Data Management
>>
>> ——
>> Oifig na nOibreacha Poiblí
>> Office of Public Works
>>
>> Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36
>> Jonathan Swift Street, Trim, Co Meath, C15 NX36
>> ——
>> M +353 87 688 5964   T +353 46 942 2409
>> https://www.opw.ie
>>
>> ——
>> To send me files larger than 30MB, please use the link below
>> https://filetransfer.opw.ie/filedrop/richard.mcdonn...@opw.ie
>>
>> Email Disclaimer: https://www.opw.ie/en/disclaimer/
>> > -Original Message-
>> > From: QGIS-User  On Behalf Of Greg
>> > Troxel via QGIS-User
>> > Sent: 02 June 2023 11:51
>> > To: Sébastien LAGARDE via QGIS-User 
>> > Cc: KEITA Mamady kobélé 
>> > Subject: Re: [Qgis-user] Technical specifications
>> >
>> > Sébastien LAGARDE via QGIS-User  writes:
>> >
>> > Keep in mind that I have not used QGIS in a super serious way, and
>> haven't
>> > even tried to figure out how much resources it needs, other that on my
>> > desktop (a hand-me-down machine that was high end in 2014, with 24 GB
>> > RAM), it runs fine.
>> >
>> > There's a huge question not asked or answered, which is about operating
>> > system.  I personally would not even consider using Windows, but that's
>> me
>> > :-)
>> >
>> > > GIS operator Workstation (standard use)
>> > >
>> > >   *   Intel i5 or higher (12th gen) or AMD equivalent
>> > >   *   16 Gb RAM
>> > >   *   512 Gb HD but only SSD or even better PCI / NVME drives
>> > >   *   Small dedicated graphic card (any entry level card with 2-4 Gb
>> of
>> > dedicated memory)
>> > >   *   1 Gb network
>> >
>> > This seems reasonable, but:
>> >
>> >   Knowing how much 

Re: [Qgis-user] Technical specifications

[KEITA Mamady kobélé via QGIS-User]

Thanks to all for these useful tips and suggestions.
The beneficiary service has a limited GIS Capability and we are preparing a
training program as well.
The internet is not that strong, so giving priority to desktop softwares. A
cloud will be USED mainly for storage purpose, not really for WMS.

Many thanks,
Mamady

On Fri, Jun 2, 2023, 11:39 AM Richard McDonnell 
wrote:

> Hi All,
> I would like to just throw my two cents in on this.
> If Raster processing is envisaged, push it out to 32 minimum 64
> recommended and 128 if you can stretch.
> As for Processors, you need as many Threads as you can afford, with a good
> base clock.
> I would agree with the use of SSD I would also recommend the use of a good
> PCI/NVME drive for boot, operating system and software, but also a second
> Solid State drive for storage of data you are working on. It's best not to
> be processing over a network, if at all possible.
> Two decent screens are a must and I agree that a good Mouse and Keyboard
> are almost always overlooked.
> In relation to Operating System, Its personal preference. Both Linux and
> Windows are stable, with varying degrees of involvement.
> If you go down the windows operating system route, I would advise using
> the OSGeo4W installer to install everything. It keeps everything working
> well in one environment, installing all dependencies. It even making
> running GDAL or Python commands from Command line easier as it has its own
> OsGeo4w Shell. Updating and installing additional tools and library's is
> also a breeze. BIG SHOUT OUT TO THE DEVS!!!
> I hope that helps!!
> Kind Regards,
>
> Richard.
>
>
>
>
>
> ——
> Richard McDonnell MSc GIS, FME Certified Professional
> FRM Data Management
>
> ——
> Oifig na nOibreacha Poiblí
> Office of Public Works
>
> Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36
> Jonathan Swift Street, Trim, Co Meath, C15 NX36
> ——
> M +353 87 688 5964   T +353 46 942 2409
> https://gov.ie/opw
>
> ——
> To send me files larger than 30MB, please use the link below
> https://filetransfer.opw.ie/filedrop/richard.mcdonn...@opw.ie
>
> Email Disclaimer:
> https://www.gov.ie/en/organisation-information/439daf-email-disclaimer/
>
>
>
> ——
> Richard McDonnell MSc GIS, FME Certified Professional
> FRM Data Management
>
> ——
> Oifig na nOibreacha Poiblí
> Office of Public Works
>
> Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36
> Jonathan Swift Street, Trim, Co Meath, C15 NX36
> ——
> M +353 87 688 5964   T +353 46 942 2409
> https://www.opw.ie
>
> ——
> To send me files larger than 30MB, please use the link below
> https://filetransfer.opw.ie/filedrop/richard.mcdonn...@opw.ie
>
> Email Disclaimer: https://www.opw.ie/en/disclaimer/
> > -Original Message-
> > From: QGIS-User  On Behalf Of Greg
> > Troxel via QGIS-User
> > Sent: 02 June 2023 11:51
> > To: Sébastien LAGARDE via QGIS-User 
> > Cc: KEITA Mamady kobélé 
> > Subject: Re: [Qgis-user] Technical specifications
> >
> > Sébastien LAGARDE via QGIS-User  writes:
> >
> > Keep in mind that I have not used QGIS in a super serious way, and
> haven't
> > even tried to figure out how much resources it needs, other that on my
> > desktop (a hand-me-down machine that was high end in 2014, with 24 GB
> > RAM), it runs fine.
> >
> > There's a huge question not asked or answered, which is about operating
> > system.  I personally would not even consider using Windows, but that's
> me
> > :-)
> >
> > > GIS operator Workstation (standard use)
> > >
> > >   *   Intel i5 or higher (12th gen) or AMD equivalent
> > >   *   16 Gb RAM
> > >   *   512 Gb HD but only SSD or even better PCI / NVME drives
> > >   *   Small dedicated graphic card (any entry level card with 2-4 Gb of
> > dedicated memory)
> > >   *   1 Gb network
> >
> > This seems reasonable, but:
> >
> >   Knowing how much disk one needs requires a plan of how the system is
> >   going to to be used.  With most data in a database, the question would
> >   be then how much imagery you will have locally.
> >
> >   In 2023, I can't recommend buying any computer for desktop use with
> >   less than 32 GB of RAM.  Almost always, my computers have become
> >   unusable due to low RAM, before anything else, usually after more than
> >   10 years.  If it is easily possible to upgrade, and there's evidence
> >   that running QGIS and other things at once (browser, mail client, ?)
> >   really fits in 16 GB *without any need to page anything back in*, then
> >   maybe that's ok.  But it strikes me as likely too little.  (If it's
> >   not easily possible to upgrade, buying a 16 GB computer is just plain
> >   unwise IMHO.)
> >
> > > GIS analyst Workstation (double up) :
> > >
> > >   *   Intel i7or higher (12th gen) or AMD equivalent
> > >   *   32Gb RAM
> > >   *   1 Tb HD but only SSD or even better PCI / NVME drives
> > >   *   dedicated graphic card (4 Gb of dedicated memory)
> > >   *   1 Gb network
> >
> > Again I might go higher in RAM.
> >
> > > And don’t forget to 

[Qgis-user] Comments on DCAT-US Metadata Schema version 3.0 requested

[Newcomb, Doug via QGIS-User]

Hi Folks,
I was asked to spread the word to the internal and external open source 
geospatial communities that version 3.0 of the DCAT-US Metadata Schema is under 
development and  open to public comment.  If you, or your organization, is 
interested in helping to shape the next US Metadata Schema, feel free to 
comment and/or contribute via github:
https://github.com/DOI-DO/dcat-us
https://github.com/DOI-DO/dcat-us/issues

Doug

Doug Newcomb - Cartographer
USFWS
551F Pylon Dr
Raleigh, NC
919-856-4520 ext. 14 doug_newc...@fws.gov
-

NOTE: This email correspondence and any attachments to and from this sender is 
subject to the Freedom of Information Act (FOIA) and may be disclosed to third 
parties.​

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Re: [Qgis-user] Technical specifications

[Richard McDonnell via QGIS-User]

Hi All,
I would like to just throw my two cents in on this.
If Raster processing is envisaged, push it out to 32 minimum 64 recommended and 
128 if you can stretch.
As for Processors, you need as many Threads as you can afford, with a good base 
clock.
I would agree with the use of SSD I would also recommend the use of a good 
PCI/NVME drive for boot, operating system and software, but also a second Solid 
State drive for storage of data you are working on. It's best not to be 
processing over a network, if at all possible.
Two decent screens are a must and I agree that a good Mouse and Keyboard are 
almost always overlooked.
In relation to Operating System, Its personal preference. Both Linux and 
Windows are stable, with varying degrees of involvement.
If you go down the windows operating system route, I would advise using the 
OSGeo4W installer to install everything. It keeps everything working well in 
one environment, installing all dependencies. It even making running GDAL or 
Python commands from Command line easier as it has its own OsGeo4w Shell. 
Updating and installing additional tools and library's is also a breeze. BIG 
SHOUT OUT TO THE DEVS!!!
I hope that helps!!
Kind Regards,

Richard.





——
Richard McDonnell MSc GIS, FME Certified Professional
FRM Data Management

——
Oifig na nOibreacha Poiblí
Office of Public Works

Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36
Jonathan Swift Street, Trim, Co Meath, C15 NX36
——
M +353 87 688 5964   T +353 46 942 2409
https://gov.ie/opw

——
To send me files larger than 30MB, please use the link below 
https://filetransfer.opw.ie/filedrop/richard.mcdonn...@opw.ie

Email Disclaimer: 
https://www.gov.ie/en/organisation-information/439daf-email-disclaimer/



——
Richard McDonnell MSc GIS, FME Certified Professional
FRM Data Management

——
Oifig na nOibreacha Poiblí
Office of Public Works

Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36
Jonathan Swift Street, Trim, Co Meath, C15 NX36
——
M +353 87 688 5964   T +353 46 942 2409
https://www.opw.ie

——
To send me files larger than 30MB, please use the link below 
https://filetransfer.opw.ie/filedrop/richard.mcdonn...@opw.ie

Email Disclaimer: https://www.opw.ie/en/disclaimer/
> -Original Message-
> From: QGIS-User  On Behalf Of Greg
> Troxel via QGIS-User
> Sent: 02 June 2023 11:51
> To: Sébastien LAGARDE via QGIS-User 
> Cc: KEITA Mamady kobélé 
> Subject: Re: [Qgis-user] Technical specifications
>
> Sébastien LAGARDE via QGIS-User  writes:
>
> Keep in mind that I have not used QGIS in a super serious way, and haven't
> even tried to figure out how much resources it needs, other that on my
> desktop (a hand-me-down machine that was high end in 2014, with 24 GB
> RAM), it runs fine.
>
> There's a huge question not asked or answered, which is about operating
> system.  I personally would not even consider using Windows, but that's me
> :-)
>
> > GIS operator Workstation (standard use)
> >
> >   *   Intel i5 or higher (12th gen) or AMD equivalent
> >   *   16 Gb RAM
> >   *   512 Gb HD but only SSD or even better PCI / NVME drives
> >   *   Small dedicated graphic card (any entry level card with 2-4 Gb of
> dedicated memory)
> >   *   1 Gb network
>
> This seems reasonable, but:
>
>   Knowing how much disk one needs requires a plan of how the system is
>   going to to be used.  With most data in a database, the question would
>   be then how much imagery you will have locally.
>
>   In 2023, I can't recommend buying any computer for desktop use with
>   less than 32 GB of RAM.  Almost always, my computers have become
>   unusable due to low RAM, before anything else, usually after more than
>   10 years.  If it is easily possible to upgrade, and there's evidence
>   that running QGIS and other things at once (browser, mail client, ?)
>   really fits in 16 GB *without any need to page anything back in*, then
>   maybe that's ok.  But it strikes me as likely too little.  (If it's
>   not easily possible to upgrade, buying a 16 GB computer is just plain
>   unwise IMHO.)
>
> > GIS analyst Workstation (double up) :
> >
> >   *   Intel i7or higher (12th gen) or AMD equivalent
> >   *   32Gb RAM
> >   *   1 Tb HD but only SSD or even better PCI / NVME drives
> >   *   dedicated graphic card (4 Gb of dedicated memory)
> >   *   1 Gb network
>
> Again I might go higher in RAM.
>
> > And don’t forget to include in your quotations good interfaces
> > (screens = min of 2*24 “, good keyboard and High DPI mouse), we tend
> > to neglect them and use what comes was standard with orders but good
> > large screens and a comfortable mouse does change your long term
> > experience !!
>
> Great advice.  I'm running with one monitor now but this would be a big
> improvement.
>
> ___
> QGIS-User mailing list
> QGIS-User@lists.osgeo.org
> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
> Unsubscribe: 

Re: [Qgis-user] Technical specifications

[Greg Troxel via QGIS-User]

Sébastien LAGARDE via QGIS-User  writes:

Keep in mind that I have not used QGIS in a super serious way, and
haven't even tried to figure out how much resources it needs, other that
on my desktop (a hand-me-down machine that was high end in 2014, with 24
GB RAM), it runs fine.

There's a huge question not asked or answered, which is about operating
system.  I personally would not even consider using Windows, but that's
me :-)

> GIS operator Workstation (standard use)
>
>   *   Intel i5 or higher (12th gen) or AMD equivalent
>   *   16 Gb RAM
>   *   512 Gb HD but only SSD or even better PCI / NVME drives
>   *   Small dedicated graphic card (any entry level card with 2-4 Gb of 
> dedicated memory)
>   *   1 Gb network

This seems reasonable, but:

  Knowing how much disk one needs requires a plan of how the system is
  going to to be used.  With most data in a database, the question would
  be then how much imagery you will have locally.

  In 2023, I can't recommend buying any computer for desktop use with
  less than 32 GB of RAM.  Almost always, my computers have become
  unusable due to low RAM, before anything else, usually after more than
  10 years.  If it is easily possible to upgrade, and there's evidence
  that running QGIS and other things at once (browser, mail client, ?)
  really fits in 16 GB *without any need to page anything back in*, then
  maybe that's ok.  But it strikes me as likely too little.  (If it's
  not easily possible to upgrade, buying a 16 GB computer is just plain
  unwise IMHO.)

> GIS analyst Workstation (double up) :
>
>   *   Intel i7or higher (12th gen) or AMD equivalent
>   *   32Gb RAM
>   *   1 Tb HD but only SSD or even better PCI / NVME drives
>   *   dedicated graphic card (4 Gb of dedicated memory)
>   *   1 Gb network

Again I might go higher in RAM.

> And don’t forget to include in your quotations good interfaces
> (screens = min of 2*24 “, good keyboard and High DPI mouse), we tend
> to neglect them and use what comes was standard with orders but good
> large screens and a comfortable mouse does change your long term
> experience !!

Great advice.  I'm running with one monitor now but this would be a big
improvement.

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Re: [Qgis-user] Technical specifications

[Bo Victor Thomsen via QGIS-User]

And one other point (outside the scope of QGIS workstation 
specifications ) -


Use a database server to store you primary spatial (and other) data. 
Preferably PostgreSQL/ PostGIS. It will enable the department to use and 
share data at the highest level.


Med venlig hilsen / Best regards

Bo Victor Thomsen

Den 01-06-2023 kl. 23:17 skrev Sébastien LAGARDE via QGIS-User:


Hello Mamady,

Question way to broad to be answered simply as it would depend on :

The tasks to be performed by the operator

Your Information system (network, storage of GIS data …)

And many other things …

Here are a few things I have in mind :

*_GIS operator Workstation (standard use)_*

  * Intel i5 or higher (12^th gen) or AMD equivalent
  * 16 Gb RAM
  * 512 Gb HD but only SSD or even better PCI / NVME drives
  * Small dedicated graphic card (any entry level card with 2-4 Gb of
dedicated memory)
  * 1 Gb network

*_GIS analyst Workstation (double up) :_*

  * Intel i7or higher (12^th gen) or AMD equivalent
  * 32Gb RAM
  * 1 Tb HD but only SSD or even better PCI / NVME drives
  * dedicated graphic card (4 Gb of dedicated memory)
  * 1 Gb network

And don’t forget to include in your quotations good interfaces 
(screens = min of 2*24 “, good keyboard and High DPI mouse), we tend 
to neglect them and use what comes was standard with orders but good 
large screens and a comfortable mouse does change your long term 
experience !!


With that kind of spec, you should be able to achieve a lot but once 
again it will depend on what type of task you’re looking at and also 
your GIS set up (for instance no need for extra-large local drives if 
you have DB servers and a good network).


Once again there is no one for all answer here .

Regards

*Sébastien LAGARDE*

Portable : (687) 76 82 24

Agissons au quotidien pour préserver notre environnement. N’imprimez 
ce courrier et les documents joints que si nécessaire


*De :* QGIS-User  *De la part de* 
KEITA Mamady kobélé via QGIS-User

*Envoyé :* jeudi 1 juin 2023 21:34
*À :* qgis-user@lists.osgeo.org
*Objet :* [Qgis-user] Technical specifications

Dear All,

We are supporting the development of a GIS department within an  
Environment Ministry.


Can you any help sharing some specifications for desktop computers and 
laptops?


Many thanks,

Mamady


/---/

*/Mamady Kobélé Keita/*



THINK ENVIRONMENT BEFORE PRINTING THIS EMAIL

*"We should leave this Planet a little bit better than we found it"*


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