[Qgis-user] Upsampling TIN

[joolek]

Hi Experts,

I've tried so many software's without success.
Is it possible to upsample existing TIN? What I mean is for example divide
each triangle into two for example. Not interpolation but somehow...
subdivide or add more vertices between existing one?
Thank you for all your time
J
___
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

[Qgis-user] Loss of scale after clipping

[David Addy]

I am finding that after clipping a raster the resulting clipped file has no
scale. Or rather the scale says 0:1 and stays at 0:1 whatever the zoom
level. 
This persists for all the map, whatever layers are on or off.
Can anyone help, please?
I am running 3.8.3 on Widows 10.



--
Sent from: http://osgeo-org.1560.x6.nabble.com/QGIS-User-f4125267.html
___
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

Re: [Qgis-user] Upsampling TIN

[b.j.kob...@utwente.nl]

The main question is actually: why would you want to do that? You just end up 
with a larger data structure (more triangles) to show exactly the same surface 
model. You would not have any more detail, i.e the smaller triangles inside the 
original large one would have exactly the same azimuth and slope and therefore 
add no terrain detail...

yours,

--
Barend Köbben



On 04/10/2019, 09:41, "Qgis-user on behalf of joolek" 
mailto:qgis-user-boun...@lists.osgeo.org> on 
behalf of joole...@gmail.com> wrote:

Hi Experts,

I've tried so many software's without success.
Is it possible to upsample existing TIN? What I mean is for example divide each 
triangle into two for example. Not interpolation but somehow... subdivide or 
add more vertices between existing one?
Thank you for all your time
J
___
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

Re: [Qgis-user] Upsampling TIN

[Luigi Pirelli]

IMHO tension surface simulation for example can be an application where a
TIN up sample could be necessary

Luigi Pirelli

**
* LinkedIn: https://www.linkedin.com/in/luigipirelli
* Stackexchange: http://gis.stackexchange.com/users/19667/luigi-pirelli
* GitHub: https://github.com/luipir
* Book: Mastering QGIS3 - 3rd Edition

* Hire a team: http://www.qcooperative.net
**


On Fri, 4 Oct 2019 at 10:14, b.j.kob...@utwente.nl 
wrote:

> The main question is actually: why would you want to do that? You just end
> up with a larger data structure (more triangles) to show exactly the same
> surface model. You would not have any more detail, i.e the smaller
> triangles inside the original large one would have exactly the same azimuth
> and slope and therefore add no terrain detail...
>
>
>
> yours,
>
>
>
> --
>
> Barend Köbben
>
>
>
>
>
>
>
> On 04/10/2019, 09:41, "Qgis-user on behalf of joolek" <
> qgis-user-boun...@lists.osgeo.org on behalf of joole...@gmail.com> wrote:
>
>
>
> Hi Experts,
>
>
>
> I've tried so many software's without success.
>
> Is it possible to upsample existing TIN? What I mean is for example divide
> each triangle into two for example. Not interpolation but somehow...
> subdivide or add more vertices between existing one?
>
> Thank you for all your time
>
> J
> ___
> 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
___
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

Re: [Qgis-user] Upsampling TIN

[joolek]

Hi,
I am more interested to have a point in between rather than the triangles,
basically interpolate the data twice, to have an extra vertex between the
existing one.
J

On Fri, 4 Oct 2019 at 09:23, Luigi Pirelli  wrote:

> IMHO tension surface simulation for example can be an application where a
> TIN up sample could be necessary
>
> Luigi Pirelli
>
>
> **
> * LinkedIn: https://www.linkedin.com/in/luigipirelli
> * Stackexchange: http://gis.stackexchange.com/users/19667/luigi-pirelli
> * GitHub: https://github.com/luipir
> * Book: Mastering QGIS3 - 3rd Edition
> 
> * Hire a team: http://www.qcooperative.net
>
> **
>
>
> On Fri, 4 Oct 2019 at 10:14, b.j.kob...@utwente.nl 
> wrote:
>
>> The main question is actually: why would you want to do that? You just
>> end up with a larger data structure (more triangles) to show exactly the
>> same surface model. You would not have any more detail, i.e the smaller
>> triangles inside the original large one would have exactly the same azimuth
>> and slope and therefore add no terrain detail...
>>
>>
>>
>> yours,
>>
>>
>>
>> --
>>
>> Barend Köbben
>>
>>
>>
>>
>>
>>
>>
>> On 04/10/2019, 09:41, "Qgis-user on behalf of joolek" <
>> qgis-user-boun...@lists.osgeo.org on behalf of joole...@gmail.com> wrote:
>>
>>
>>
>> Hi Experts,
>>
>>
>>
>> I've tried so many software's without success.
>>
>> Is it possible to upsample existing TIN? What I mean is for example
>> divide each triangle into two for example. Not interpolation but somehow...
>> subdivide or add more vertices between existing one?
>>
>> Thank you for all your time
>>
>> J
>> ___
>> 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
>
>
___
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

Re: [Qgis-user] Upsampling TIN

[b.j.kob...@utwente.nl]

?? a point in between what? A TIN is a set of triangles, where each corner 
represents an X,Y,Z point in space (on a surface usually). So where do you nwat 
to have and extra vertex...? Sounds like you are not wanting aq TIN in the end, 
but something else...

Barend

On 04/10/2019, 10:47, "joolek" mailto:joole...@gmail.com>> 
wrote:

Hi,
I am more interested to have a point in between rather than the triangles, 
basically interpolate the data twice, to have an extra vertex between the 
existing one.
J

On Fri, 4 Oct 2019 at 09:23, Luigi Pirelli 
mailto:lui...@gmail.com>> wrote:
IMHO tension surface simulation for example can be an application where a TIN 
up sample could be necessary

Luigi Pirelli

**
* LinkedIn: https://www.linkedin.com/in/luigipirelli
* Stackexchange: http://gis.stackexchange.com/users/19667/luigi-pirelli
* GitHub: https://github.com/luipir
* Book: Mastering QGIS3 - 3rd 
Edition
* Hire a team: http://www.qcooperative.net
**


On Fri, 4 Oct 2019 at 10:14, 
b.j.kob...@utwente.nl 
mailto:b.j.kob...@utwente.nl>> wrote:
The main question is actually: why would you want to do that? You just end up 
with a larger data structure (more triangles) to show exactly the same surface 
model. You would not have any more detail, i.e the smaller triangles inside the 
original large one would have exactly the same azimuth and slope and therefore 
add no terrain detail...

yours,

--
Barend Köbben



On 04/10/2019, 09:41, "Qgis-user on behalf of joolek" 
mailto:qgis-user-boun...@lists.osgeo.org> on 
behalf of joole...@gmail.com> wrote:

Hi Experts,

I've tried so many software's without success.
Is it possible to upsample existing TIN? What I mean is for example divide each 
triangle into two for example. Not interpolation but somehow... subdivide or 
add more vertices between existing one?
Thank you for all your time
J
___
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
___
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

Re: [Qgis-user] Upsampling TIN

[Nicolas Cadieux]

Hi,

You cannot invent new data between point without doing an interpolation. Your 
choice of interpolation will determine the quality of this data.  The only way 
I can think of is to create a raster from this TIN.  Then, resample 
(re-interpolated) this raster with a finer pixel and then make a new TIN.  This 
may create a finer TIN but this will significantly alter the original data.  
You would need to evaluate the results and keep a backup of the old files.

Alternative, I would try with Mesh Lab.  It’s open source and probably has Mesh 
densification methods that would be more adapted.  Cloud Compare also has 
interesting algorithms. 
Nicolas

> Le 4 oct. 2019 à 03:40, joolek  a écrit :
> 
> Hi Experts, 
> 
> I've tried so many software's without success.
> Is it possible to upsample existing TIN? What I mean is for example divide 
> each triangle into two for example. Not interpolation but somehow... 
> subdivide or add more vertices between existing one?
> Thank you for all your time
> J
> ___
> 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
___
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

[Qgis-user] Qgis 2.18 support

[Tudorache, Marian]

Hi,

I currently use Qgis 2.18. on Centos.
I would like to know if this will be supported and for how long?
We tried to upgrade to QGIS 3.x but there are backward compatibility issues.
Also there are dependencies issues.

Thanks,
Marian




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 reproduction, divulgation ou distribution 
du présent message électronique est strictement interdite. NAV CANADA n'assume 
aucune responsabilité en cas de dommage causé par tout virus ou autre programme 
malveillant transmis par ce message électronique.
___
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

[Qgis-user] Shortest path (Network Analysis)

[Tsering W. Shawa]

I am trying to find a tool in QGIS that will allow me to calculate shortest 
path between two layers (number of hospitals to number of addresses) using road 
network data. There are two plugins (Networks and QNEAT3) and Network analysis 
tools in Processing Toolbox but none of them allow me to calculate shortest 
path between two layers. Either the tools will allow me to find the shortest 
route between a layer (multiple locations) to a single location by picking 
interactively an origin or a destination location or interactively picking one 
an origin and a destination location. However, none of the tools will allow a 
person to upload or select two layers that has multiple point locations to 
calculate the shortest path.

Any recommendation for tools to solve my problem?

Thanks,
-Wangyal


___
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

Re: [Qgis-user] Qgis 2.18 support

[Jürgen E . Fischer]

Hi Marian,

On Fri, 04. Oct 2019 at 13:16:23 +, Tudorache, Marian wrote:
> I currently use Qgis 2.18. on Centos.
> I would like to know if this will be supported and for how long?

QGIS 2.18 support (as far as the QGIS project is concerned) ended in January
2018, 3.4 LTR support is going to end soon too and will be replaced by the
next 3.10 LTR.

See
https://qgis.org/en/site/getinvolved/development/roadmap.html#release-schedule 


Jürgen

-- 
Jürgen E. Fischer   norBIT GmbH Tel. +49-4931-918175-31
Dipl.-Inf. (FH) Rheinstraße 13  Fax. +49-4931-918175-50
Software Engineer   D-26506 Nordenhttps://www.norbit.de
QGIS release manager (PSC)  GermanyIRC: jef on FreeNode


signature.asc
Description: PGP signature
norBIT Gesellschaft fuer Unternehmensberatung und Informationssysteme mbH
Rheinstrasse 13, 26506 Norden
GF: Juergen Fischer, Nils Kutscher HR: Amtsgericht Aurich HRB 100827
Datenschutzerklaerung: https://www.norbit.de/83/
___
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

Re: [Qgis-user] Upsampling TIN

[Falk Huettmann]

Hi,
I agree with Barend and Nicolas here.

It's a typical and essential question that we get all the time, like,
can we re-grid and subsample pixels ?
=>You can, technically, but you stay just within the same data,
and thus, create nothing new or meaningful.

In other words, it should not be done.

There is a lot wrong with re-sampling, gridding, within DEMs, with merging
grids,
reprojecting and interpolation surfaces. And GIS techs are pretty guilty of
that,
so are their supervisors.
The tools we provide should point that out clearly and not allow for it.

Key to those questions remain 'ethics', metadata of course (!) and then
always a comparison as a benchmark for
accuracy and to see the actual gain of such re-samplings.

(but let's agree that TINs are only one way of getting a surface, often not
the best one,
when compared to the 'truth'. Playing around with them for best output is
not a bad idea)

  Very best
Falk Huettmann




On Fri, Oct 4, 2019 at 4:00 AM Nicolas Cadieux 
wrote:

> Hi,
>
> You cannot invent new data between point without doing an interpolation.
> Your choice of interpolation will determine the quality of this data.  The
> only way I can think of is to create a raster from this TIN.  Then,
> resample (re-interpolated) this raster with a finer pixel and then make a
> new TIN.  This may create a finer TIN but this will significantly alter the
> original data.  You would need to evaluate the results and keep a backup of
> the old files.
>
> Alternative, I would try with Mesh Lab.  It’s open source and probably has
> Mesh densification methods that would be more adapted.  Cloud Compare also
> has interesting algorithms.
> Nicolas
>
> > Le 4 oct. 2019 à 03:40, joolek  a écrit :
> >
> > Hi Experts,
> >
> > I've tried so many software's without success.
> > Is it possible to upsample existing TIN? What I mean is for example
> divide each triangle into two for example. Not interpolation but somehow...
> subdivide or add more vertices between existing one?
> > Thank you for all your time
> > J
> > ___
> > 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
> ___
> 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
___
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

[Qgis-user] About QTiles pugin

[joonas moisio]

Hi

I have problem with Qtiles when I'm creating mapset (mbtiles file) . Tile
border breaks "point labels" when label cross the border between two tiles.
(no problem when point label is center of tile). Sometimes there could be
only part in visible for label on some zoom levels. When zooming in or out,
point label may be visible on next zoom level. Does anyone know, is it
possible to render point labels to many tiles? It will be more comfortable
to read map when labels will be perfectly visible in all zoom levels.

-Joonas
___
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

Re: [Qgis-user] Shortest path (Network Analysis)

[Nicolas Cadieux]

Hi,

Is there an all-paires options?  If so, you can put the source and destination 
in the same file and all possible source and destinations will be done.  You 
will then need to filter of what you don’t need.  How many routes are you 
dealing with?

I may have something for you but it’s not published OpenSource yet.  Could be 
useful if you have millions of routes to calculate.

Nicolas

> Le 4 oct. 2019 à 09:59, Tsering W. Shawa  a écrit :
> 
> I am trying to find a tool in QGIS that will allow me to calculate shortest 
> path between two layers (number of hospitals to number of addresses) using 
> road network data. There are two plugins (Networks and QNEAT3) and Network 
> analysis tools in Processing Toolbox but none of them allow me to calculate 
> shortest path between two layers. Either the tools will allow me to find the 
> shortest route between a layer (multiple locations) to a single location by 
> picking interactively an origin or a destination location or interactively 
> picking one an origin and a destination location. However, none of the tools 
> will allow a person to upload or select two layers that has multiple point 
> locations to calculate the shortest path.
> 
> Any recommendation for tools to solve my problem?
> 
> Thanks,
> -Wangyal
> 
> 
> ___
> 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
___
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

Re: [Qgis-user] Loss of scale after clipping

[Mike Flannigan]

I could easily be wrong, but I say I (and you) cannot
clip a raster layer.  In the clip box the selections
for "Input layer" do not include raster layers.

QGIS 3.2.0 - Win7.



Mike


On 10/4/2019 7:00 AM, qgis-user-requ...@lists.osgeo.org wrote:

I am finding that after clipping a raster the resulting clipped file has no
scale. Or rather the scale says 0:1 and stays at 0:1 whatever the zoom
level.
This persists for all the map, whatever layers are on or off.
Can anyone help, please?
I am running 3.8.3 on Widows 10.



___
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

[Qgis-user] Layouts --> Show maps in irregular polygon like a Tetris

[Miquel Pujol Garcia]

*Hi QGIS users & developers !!!*

In layout, you can insert many maps (Add map), but only can be regular
polygons (square or rectangular), but when you want to create a special
presentation like a Tetris, you can't do it. The figures circle,
triangular, add polygon,... can't show maps inside them.
Someone know how can show maps inside irregular polygons in layouts?
Would be nice that QGIS has this options in layouts...

[image: Test.jpeg]

Thanks,

*Miquel Pujol Garcia*
___
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

Re: [Qgis-user] Shortest path (Network Analysis)

[Paul Wittle]

Hi,

I've also been investigating this sort of work over the last two weeks and have 
largely come to the same conclusion. I don't think there is a way to do it 
directly at present without a chargeable plugin but I can't help but feel that 
it might be possible to create a processing toolbox script which achieves 
traveling sales using the tools available. QNEAT3 allows you to create a 
distance matrix and it is not difficult to merge two point layers to get a 
matrix with the required information. Once you have a distance matrix then in 
theory there should be algorithms / documented methods somewhere by which we 
can extract an optimal route order from the results.

That said, I've not had the time to look at this myself and of bigger concern 
is the lack of support for turn restrictions in the default routing tools. This 
means that the standard QGIS tools (and I assume QNEAT3 although I've not 
really looked at Networks) will be jumping off bridges and recommending banned 
turns.

It would be interesting to know if any of the stuff I've mentioned above is 
being looked at as I might be interested in working with others to develop some 
improvements at some point; subject to finding time and employer approval.

Sorry I can't be more helpful but perhaps it will give you a manual method in 
the short term,
Paul

https://www.jstor.org/stable/167205?seq=1#page_scan_tab_contents (example 
academic paper)

Message: 2
Date: Fri, 4 Oct 2019 13:59:36 +
From: "Tsering W. Shawa" 
To: "qgis-user@lists.osgeo.org" 
Subject: [Qgis-user] Shortest path (Network Analysis)
Message-ID:



Content-Type: text/plain; charset="iso-8859-1"

I am trying to find a tool in QGIS that will allow me to calculate shortest 
path between two layers (number of hospitals to number of addresses) using road 
network data. There are two plugins (Networks and QNEAT3) and Network analysis 
tools in Processing Toolbox but none of them allow me to calculate shortest 
path between two layers. Either the tools will allow me to find the shortest 
route between a layer (multiple locations) to a single location by picking 
interactively an origin or a destination location or interactively picking one 
an origin and a destination location. However, none of the tools will allow a 
person to upload or select two layers that has multiple point locations to 
calculate the shortest path.

Any recommendation for tools to solve my problem?

Thanks,
-Wangyal


This e-mail and any files transmitted with it are intended solely for the use 
of the individual or entity to whom they are addressed. It may contain 
unclassified but sensitive or protectively marked material and should be 
handled accordingly. Unless you are the named addressee (or authorised to 
receive it for the addressee) you may not copy or use it, or disclose it to 
anyone else. If you have received this transmission in error please notify the 
sender immediately. All traffic may be subject to recording and/or monitoring 
in accordance with relevant legislation. Any views expressed in this message 
are those of the individual sender, except where the sender specifies and with 
authority, states them to be the views of Dorset Council. Dorset Council does 
not accept service of documents by fax or other electronic means. Virus 
checking: Whilst all reasonable steps have been taken to ensure that this 
electronic communication and its attachments whether encoded, encrypted or 
otherwise supplied are free from computer viruses, Dorset Council accepts no 
liability in respect of any loss, cost, damage or expense suffered as a result 
of accessing this message or any of its attachments. For information on how 
Dorset Council processes your information, please see 
www.dorsetcouncil.gov.uk/416433
___
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