Re: [Qgis-user] Upsampling TIN

[Saber Razmjooei]

Hi,

If you want to see your TIN as raw data, without interpolation and
conversion to gridded format, best to have it supported as a "mesh layer":
https://docs.qgis.org/3.4/en/docs/user_manual/working_with_mesh/mesh_properties.html

To add support for it, you need to have it in MDAL:
https://github.com/lutraconsulting/MDAL/

There are processing tools to convert it to regular vector or raster (at
user-defined resolution), but you should be able to work with the native
nodes/edges/surfaces directly from QGIS.

Regards
Saber

On Fri, 4 Oct 2019 at 18:09, Falk Huettmann  wrote:

> 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 <
> nicolas.cadi...@archeotec.ca> 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
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Re: [Qgis-user] Thank you for the Label Toolbar and moveable labels

[Paolo Cavallini]

Thanks Johanna, it is good to know people appreciate what we are doing,
for the freedom of all. Please consider cooperating directly with the
project: everyone can help improving even further:
https://www.qgis.org/en/site/getinvolved/index.html
Cheers.

On 10/10/19 02:23, Johanna Botman wrote:
> So just a quick word to say thank you to everyone who helped develop the
> moveable labels in the 3 Series QGIS.
> 
>  
> 
> I’ve just had the need to use this functionality and it made my task SO
> easy.
> 
>  
> 
> Thank you
> 
> Thank you
> 
> Thank you
> 
>  
> 
> * *
> 
> * *
> 
> *Johanna Botman*
> 
> Asset & GIS Officer | *Melton City Council*
> 
> * *
> 
>  
> 
> 
> ***
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Re: [Qgis-user] QGis 3.8 : Still not possible to export maps in multilayer pdf format ?

[Stefan Giese]

Hi Jürgen,

thanks...good to know!

Stefan

Mit freundlichen Grüßen
Stefan Giese
Projektleiter/Consultant
***
Where2B Konferenz 2019
12. Dezember 2019 in Bonn
where2b-conference.com
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Am 10.10.2019 um 14:35 schrieb Jürgen E. Fischer:

Hi Stefan,

On Thu, 10. Oct 2019 at 14:23:51 +0200, Stefan Giese wrote:

it will be available from version 3.10.

if build against GDAL 3.


You can test it with the nightly build 3.9 developer versions (use osgeo4W
setup)

Which is using the GDAL 3 nightly, which in turn requires PROJ >=6 (which is
provided by the proj nightly of 7 in osgeo4w).   PROJ 6 and GDAL 3 are however
not yet supported by GRASS (see https://github.com/OSGeo/grass/pull/136),
therefore the "regular" GDAL is still 2…


Jürgen


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Re: [Qgis-user] QGis 3.8 : Still not possible to export maps in multilayer pdf format ?

[Jürgen E . Fischer]

Hi Stefan,

On Thu, 10. Oct 2019 at 14:23:51 +0200, Stefan Giese wrote:
> it will be available from version 3.10.

if build against GDAL 3.

> You can test it with the nightly build 3.9 developer versions (use osgeo4W
> setup)

Which is using the GDAL 3 nightly, which in turn requires PROJ >=6 (which is
provided by the proj nightly of 7 in osgeo4w).   PROJ 6 and GDAL 3 are however
not yet supported by GRASS (see https://github.com/OSGeo/grass/pull/136),
therefore the "regular" GDAL is still 2…


Jürgen

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Re: [Qgis-user] QGis 3.8 : Still not possible to export maps in multilayer pdf format ?

[Stefan Giese]

it will be available from version 3.10. You can test it with the nightly 
build 3.9 developer versions (use osgeo4W setup)


Mit freundlichen Grüßen
Stefan Giese
Projektleiter/Consultant
***
Where2B Konferenz 2019
12. Dezember 2019 in Bonn
where2b-conference.com
***
WhereGroup GmbH
Schwimmbadstr. 2
79100 Freiburg
Germany

Fon: +49 (0)761 / 519 102 - 61
Fax: +49 (0)761 / 519 102 - 11

stefan.gi...@wheregroup.com
www.wheregroup.com
Geschäftsführer:
Olaf Knopp, Peter Stamm
Amtsgericht Bonn, HRB 9885

Am 10.10.2019 um 14:21 schrieb Ludovic Cepre:

Hello dear user of QGis,

I'm trying to export some maps in a multilayer pdf format, but still 
cannot find the way to... I know some complex (and old) solutions has 
been used in the past, that worked, but by complex ways, and using 
others sofwares.

Any ideas more easiily ??
Thanks !
Ludovic


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Re: [Qgis-user] QGis 3.8 : Still not possible to export maps in multilayer pdf format ?

[Luca Manganelli]

Il giorno gio 10 ott 2019 alle ore 14:21 Ludovic Cepre <
ludovic.ce...@gmail.com> ha scritto:
> I'm trying to export some maps in a multilayer pdf format, but still
cannot find the way to... I know some complex (and old) solutions has been
used in the past, that worked, but by complex ways, and using others
sofwares.
> Any ideas more easiily ??

Next version of QGIS (3.10) will do it.

See here:

https://north-road.com/2019/09/03/qgis-3-10-loves-geopdf/

-- 





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[Qgis-user] QGis 3.8 : Still not possible to export maps in multilayer pdf format ?

[Ludovic Cepre]

Hello dear user of QGis,

I'm trying to export some maps in a multilayer pdf format, but still cannot
find the way to... I know some complex (and old) solutions has been used in
the past, that worked, but by complex ways, and using others sofwares.
Any ideas more easiily ??
Thanks !
Ludovic
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Re: [Qgis-user] [QGIS-Developer] Geodesic Line Simplification

[Christoph Jung]

Thank you very much for your answer. I totally forgot projections with degrees, 
sorry ^^ than geodesic math will be the more general approach. 

Sincerely,
Christoph 

> Am 09.10.2019 um 16:33 schrieb C Hamilton :
> 
> Good question. Geodesic math will take more time to compute. If you are using 
> a local projection and the area of interest is small then it will be faster 
> using euclidean math, but if your projection is using degrees (WGS84) or you 
> are covering a large area then geodesic is a better choice.
> 
> Best wishes,
> 
> Calvin
> 
>> On Wed, Oct 9, 2019 at 6:46 AM Christoph Jung  wrote:
>> Hi Calvin,
>> 
>> Splitting the algorithms would be an improvement for using them in 
>> combination with other algorithms and/or plugins. 
>> 
>> One question:
>> Does the calculations in geodesic math need more time than with eukledean 
>> math? The last months I had some questions about my plugin 
>> Offline-MapMatching and all had trajectories with a small bounding box, i.e. 
>> eukledean math would be enough for good results. The distance between 
>> following trajectory points are not so big. Why do you want to implement the 
>> geodesic math (oh, it is a second question ^^)?
>> 
>> Sincerely,
>> Christoph 
>> 
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