Re: [Qgis-user] I need a list with the azimuth of each segment and its associated morphotectonic value

[Micha Silver]

  
  
If you're willing to consider a GRASS GIS
solution, then the module v.to.db can upload azimuths of line
segments (as well as lots of other measures) to the attribute
table.

  
https://grass.osgeo.org/grass78/manuals/v.to.db.html




On 9/9/21 7:17 AM, Allan López wrote:


  
  
Dear
  all,


I have a
  SHP of river drainage which also includes a morphotectonic
  value for neighbour and continuos river segments.
I need
  to assign a direction (0-360°) to each one. I mean, I need a
  list with the azimuth of each segment and its associated
  morphotectonic value to generate a rose of directions by other
  means.


In the
  attribute table I see the graduated value for each segment now
  I need to get its azimuth


Thank
  you in advance for your kind guidance


Allan
  López
  
  
  
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cell: +972-523-665918
  

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[Qgis-user] I need a list with the azimuth of each segment and its associated morphotectonic value

[Allan López]

Dear all,

I have a SHP of river drainage which also includes a morphotectonic value
for neighbour and continuos river segments.
I need to assign a direction (0-360°) to each one. I mean, I need a list
with the azimuth of each segment and its associated morphotectonic value to
generate a rose of directions by other means.

In the attribute table I see the graduated value for each segment now I
need to get its azimuth

Thank you in advance for your kind guidance

Allan López
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Re: [Qgis-user] Sample data not loading into QGIS

[Hugh Kelley]

HI Scot, if you have a qgis window open, and open your finder window, you
should be able to drag data sources directly from your downloads folder
into qgis. You may need to unzip some of the data sources first.

Maybe someone who is more familiar with QGIS on a mac or the tutorial can
chime in with how to follow the instructions more closely but hopefully
that can get you started.

On Wed, Sep 8, 2021 at 3:06 PM scott lilliott.net 
wrote:

> All - beginner user here following the QGIS instructions to load Alaska
> data set into QGIS.
> Installed QGIS  3.20.2-Odense
> Running MacOS 10.15.3
> - downloaded the Alaska data set as linked in the instructions.
> - opened QGIS and opened the Data Source Manager browser window.
>
> There is no QGIS data folder shown and when I attempt to browse to the
> folder location (now on the desktop),
> there is nothing shown - no files, no folders.  Desktop, Downloads, and
> Documents show no files or folders.
> Dropbox does show files and folders.
>
> Is there a specific location that the QGIS folder and files need to reside
> ?
>
> Thanks for your help,
> Scott
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Re: [Qgis-user] How to replicate ARC-GIS Natural Neighbour Interpolation Algorithm in QGIS / DTM from elevation points

[Jurijs Kondratenko]

Hi Sebastian, the WhiteBox Tools looks great! Updating my QGIS (WBT works with 
QGIS v.3.18+) and hoping it will do the job!

Best wishes, 

Jurijs

 

From: Sebastian Gutwein  
Sent: Wednesday, September 8, 2021 5:17 PM
To: C Hamilton 
Cc: Jurijs Kondratenko ; qgis-user 

Subject: Re: [Qgis-user] How to replicate ARC-GIS Natural Neighbour 
Interpolation Algorithm in QGIS / DTM from elevation points

 

Just so you know all your options :). There is also the Whitebox Tools plugin 
for QGIS (you need to install whitebox tools) that has a 
NaturalNeighourInterpolation algo. "Creates a raster grid based on Sibson's 
natural neighbour method" 

 

On Wed, Sep 8, 2021 at 10:00 AM C Hamilton mailto:adenacult...@gmail.com> > wrote:

In addition to what has already been mentioned, you can use the QGIS SAGA 
Toolbox. Under Raster - Rasterizing, there is a Natural Neighbour algorithm. I 
have not used it, but I have used the Inverse Distance Weighted algorithm for 
magnetometry data which in essence does something like what you are wanting to 
do.

 

Good luck,

Calvin

 

On Wed, Sep 8, 2021 at 4:13 AM Jurijs Kondratenko mailto:yurikondrate...@inbox.lv> > wrote:

Hi, I’m building a DTM from random points (with different distances in between) 
and I like ArcGIS Natural Neighbour algorithm for doing so.

Is there any way to replicate it in QGIS? 
https://pro.arcgis.com/en/pro-app/latest/tool-reference/spatial-analyst/how-natural-neighbor-works.htm

Alternatively, what would be a way to constructing DTM from points, preserving 
the original points in respective pixels?

Thank you!

Jurijs Kondratenko

Riga Technical University

 

 

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Re: [Qgis-user] How to replicate ARC-GIS Natural Neighbour Interpolation Algorithm in QGIS / DTM from elevation points

[Jurijs Kondratenko]

Hi Richard, thanks a lot for your reply. I’m not sure about GDALDEM (quick
search told it was more for visualisation) but will check more. Nearets
Neighbour in Rastre-Analysis-Grid (Nearest Neighbour) is not quite what I’m
looking for: seems WhiteBox Tools will solve my need

 

From: Richard McDonnell  
Sent: Wednesday, September 8, 2021 4:44 PM
To: Micha Silver ; Jurijs Kondratenko
; qgis-user@lists.osgeo.org
Subject: RE: [Qgis-user] How to replicate ARC-GIS Natural Neighbour
Interpolation Algorithm in QGIS / DTM from elevation points

 

Hi, 

In addition to what Jurijsy suggested you can also use gdaldem. You can
access this in QGIS by selecting Raster from the toolbar and the selecting
Analysis and Grid Nearest Neighbour. If using Windows and an OSGeo4W
install, you can utilise the OSGeo4W Shell to run the same command via
command line.

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/ 

From: Qgis-user mailto:qgis-user-boun...@lists.osgeo.org> > On Behalf Of Micha Silver
Sent: 08 September 2021 14:04
To: Jurijs Kondratenko mailto:yurikondrate...@inbox.lv> >; qgis-user@lists.osgeo.org
 
Subject: Re: [Qgis-user] How to replicate ARC-GIS Natural Neighbour
Interpolation Algorithm in QGIS / DTM from elevation points

 

If your'e willing to try GRASS GIS, then the module v.surf.nnbathy should
help.

https://grass.osgeo.org/grass78/manuals/addons/v.surf.nnbathy.html

 

 

On 9/8/21 11:08 AM, Jurijs Kondratenko wrote:

Hi, I’m building a DTM from random points (with different distances in
between) and I like ArcGIS Natural Neighbour algorithm for doing so.

Is there any way to replicate it in QGIS?
https://pro.arcgis.com/en/pro-app/latest/tool-reference/spatial-analyst/how-
natural-neighbor-works.htm

Alternatively, what would be a way to constructing DTM from points,
preserving the original points in respective pixels?

Thank you!

Jurijs Kondratenko

Riga Technical University

 

 

 

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-- 
Micha Silver
Ben Gurion Univ.
Sde Boker, Remote Sensing Lab
cell: +972-523-665918
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Re: [Qgis-user] How to replicate ARC-GIS Natural Neighbour Interpolation Algorithm in QGIS / DTM from elevation points

[Jurijs Kondratenko]

Thanks Calvin, 

In the QGIS version I’m using, there is Nearest Neighbour algorithm. Natural 
Neighbour is smth else, and it seems the easiest way to have it for me is 
WhiteBox Tools plugin.

Best wishes, 

Jurijs

 

From: C Hamilton  
Sent: Wednesday, September 8, 2021 5:00 PM
To: Jurijs Kondratenko 
Cc: qgis-user 
Subject: Re: [Qgis-user] How to replicate ARC-GIS Natural Neighbour 
Interpolation Algorithm in QGIS / DTM from elevation points

 

In addition to what has already been mentioned, you can use the QGIS SAGA 
Toolbox. Under Raster - Rasterizing, there is a Natural Neighbour algorithm. I 
have not used it, but I have used the Inverse Distance Weighted algorithm for 
magnetometry data which in essence does something like what you are wanting to 
do.

 

Good luck,

Calvin

 

On Wed, Sep 8, 2021 at 4:13 AM Jurijs Kondratenko mailto:yurikondrate...@inbox.lv> > wrote:

Hi, I’m building a DTM from random points (with different distances in between) 
and I like ArcGIS Natural Neighbour algorithm for doing so.

Is there any way to replicate it in QGIS? 
https://pro.arcgis.com/en/pro-app/latest/tool-reference/spatial-analyst/how-natural-neighbor-works.htm

Alternatively, what would be a way to constructing DTM from points, preserving 
the original points in respective pixels?

Thank you!

Jurijs Kondratenko

Riga Technical University

 

 

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[Qgis-user] Sample data not loading into QGIS

[scott lilliott . net]

All - beginner user here following the QGIS instructions to load Alaska data 
set into QGIS.
Installed QGIS  3.20.2-Odense
Running MacOS 10.15.3
- downloaded the Alaska data set as linked in the instructions.
- opened QGIS and opened the Data Source Manager browser window.

There is no QGIS data folder shown and when I attempt to browse to the folder 
location (now on the desktop),
there is nothing shown - no files, no folders.  Desktop, Downloads, and 
Documents show no files or folders.
Dropbox does show files and folders.

Is there a specific location that the QGIS folder and files need to reside ?

Thanks for your help,
Scott 
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[Qgis-user] Is your directional linear network (road, rivers...) driving you crazy?

[Nicolas Cadieux]

Hi,

Is your directional linear network (road, rivers...) driving you crazy?

I have just uploaded  3 interdependent models will check for invalid 
geometries, identify common network errors (disconnected edges, 
multipart geometries, overlapping geometries, parallel edges, self 
connecting lines, network vectorizing direction changes...). It provides 
tools to track changes when fixes are applied to the network file.


Visit the project web site at 
https://gitlab.com/njacadieux/fix-directional-network-qgis-models and “A 
Python Algorithm for Shortest-Path River Network Distance Calculations 
Considering River Flow Direction” for more details 
https://doi.org/10.3390/data5010008 .


Built and tested on QGIS 3.20.

-Fix Directional Network, Check Geometries, model 1 of 3.

-Fix Directional Network, Check Network, model 2 of 3.

-Fix Directional Network, Fix Network, model 3 of 3.

Models have been uploaded to https://plugins.qgis.org/models/ and are 
waiting for final approval.


Thank you to René Paillard, Harrissou Delaz, Luiz Motta,  Charles 
Dixon-Paver,  Andrea Giudiceandrea, David Strip and others for reaching 
out on the QGIS mailling list and for providing test data. A special 
thanks to Margaret Kalacska, Oliver T. Coomes, Sébastien Breau, Yoshito 
Takasaki and Mari Tanaka for providing a challenge.


--
Nicolas Cadieux
https://gitlab.com/njacadieux

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Re: [Qgis-user] How to replicate ARC-GIS Natural Neighbour Interpolation Algorithm in QGIS / DTM from elevation points

[Sebastian Gutwein]

Just so you know all your options :). There is also the Whitebox Tools
plugin for QGIS (you need to install whitebox tools) that has a
NaturalNeighourInterpolation algo. "Creates a raster grid based on Sibson's
natural neighbour method"

On Wed, Sep 8, 2021 at 10:00 AM C Hamilton  wrote:

> In addition to what has already been mentioned, you can use the QGIS SAGA
> Toolbox. Under Raster - Rasterizing, there is a Natural Neighbour
> algorithm. I have not used it, but I have used the Inverse Distance
> Weighted algorithm for magnetometry data which in essence does something
> like what you are wanting to do.
>
> Good luck,
> Calvin
>
> On Wed, Sep 8, 2021 at 4:13 AM Jurijs Kondratenko <
> yurikondrate...@inbox.lv> wrote:
>
>> Hi, I’m building a DTM from random points (with different distances in
>> between) and I like ArcGIS Natural Neighbour algorithm for doing so.
>>
>> Is there any way to replicate it in QGIS?
>> https://pro.arcgis.com/en/pro-app/latest/tool-reference/spatial-analyst/how-natural-neighbor-works.htm
>>
>> Alternatively, what would be a way to constructing DTM from points,
>> preserving the original points in respective pixels?
>>
>> Thank you!
>>
>> Jurijs Kondratenko
>>
>> Riga Technical University
>>
>>
>>
>>
>> ___
>> Qgis-user mailing list
>> Qgis-user@lists.osgeo.org
>> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
>> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
>>
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Re: [Qgis-user] How to replicate ARC-GIS Natural Neighbour Interpolation Algorithm in QGIS / DTM from elevation points

[C Hamilton]

In addition to what has already been mentioned, you can use the QGIS SAGA
Toolbox. Under Raster - Rasterizing, there is a Natural Neighbour
algorithm. I have not used it, but I have used the Inverse Distance
Weighted algorithm for magnetometry data which in essence does something
like what you are wanting to do.

Good luck,
Calvin

On Wed, Sep 8, 2021 at 4:13 AM Jurijs Kondratenko 
wrote:

> Hi, I’m building a DTM from random points (with different distances in
> between) and I like ArcGIS Natural Neighbour algorithm for doing so.
>
> Is there any way to replicate it in QGIS?
> https://pro.arcgis.com/en/pro-app/latest/tool-reference/spatial-analyst/how-natural-neighbor-works.htm
>
> Alternatively, what would be a way to constructing DTM from points,
> preserving the original points in respective pixels?
>
> Thank you!
>
> Jurijs Kondratenko
>
> Riga Technical University
>
>
>
>
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Re: [Qgis-user] How to replicate ARC-GIS Natural Neighbour Interpolation Algorithm in QGIS / DTM from elevation points

[Richard McDonnell]

Hi,
In addition to what Jurijsy suggested you can also use gdaldem. You can access 
this in QGIS by selecting Raster from the toolbar and the selecting Analysis 
and Grid Nearest Neighbour. If using Windows and an OSGeo4W install, you can 
utilise the OSGeo4W Shell to run the same command via command line.
Regards,

Richard



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

--
Oifig na nOibreacha Poibl?
Office of Public Works

Sr?id Jonathan Swift, Baile ?tha Troim, Co na M?, 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: 
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From: Qgis-user  On Behalf Of Micha Silver
Sent: 08 September 2021 14:04
To: Jurijs Kondratenko ; qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] How to replicate ARC-GIS Natural Neighbour 
Interpolation Algorithm in QGIS / DTM from elevation points

If your'e willing to try GRASS GIS, then the module v.surf.nnbathy should help.
https://grass.osgeo.org/grass78/manuals/addons/v.surf.nnbathy.html


On 9/8/21 11:08 AM, Jurijs Kondratenko wrote:
Hi, I'm building a DTM from random points (with different distances in between) 
and I like ArcGIS Natural Neighbour algorithm for doing so.
Is there any way to replicate it in QGIS? 
https://pro.arcgis.com/en/pro-app/latest/tool-reference/spatial-analyst/how-natural-neighbor-works.htm
Alternatively, what would be a way to constructing DTM from points, preserving 
the original points in respective pixels?
Thank you!
Jurijs Kondratenko
Riga Technical University





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Micha Silver

Ben Gurion Univ.

Sde Boker, Remote Sensing Lab

cell: +972-523-665918
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Re: [Qgis-user] How to replicate ARC-GIS Natural Neighbour Interpolation Algorithm in QGIS / DTM from elevation points

[Micha Silver]

  
  
If your'e willing to try GRASS GIS, then the
module v.surf.nnbathy should help.
https://grass.osgeo.org/grass78/manuals/addons/v.surf.nnbathy.html




On 9/8/21 11:08 AM, Jurijs Kondratenko
  wrote:


  
  
  
  
Hi, I’m building a DTM from random points
  (with different distances in between) and I like ArcGIS
  Natural Neighbour algorithm for doing so.
Is there any way to replicate it in QGIS? https://pro.arcgis.com/en/pro-app/latest/tool-reference/spatial-analyst/how-natural-neighbor-works.htm
Alternatively, what would be a way to
  constructing DTM from points, preserving the original points
  in respective pixels?
Thank you!
Jurijs Kondratenko
Riga Technical University
 
 
  
  
  
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-- 
Micha Silver
Ben Gurion Univ.
Sde Boker, Remote Sensing Lab
cell: +972-523-665918
  

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[Qgis-user] How to replicate ARC-GIS Natural Neighbour Interpolation Algorithm in QGIS / DTM from elevation points

[Jurijs Kondratenko]

Hi, I'm building a DTM from random points (with different distances in
between) and I like ArcGIS Natural Neighbour algorithm for doing so.

Is there any way to replicate it in QGIS?
https://pro.arcgis.com/en/pro-app/latest/tool-reference/spatial-analyst/how-
natural-neighbor-works.htm

Alternatively, what would be a way to constructing DTM from points,
preserving the original points in respective pixels?

Thank you!

Jurijs Kondratenko

Riga Technical University

 

 

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