Re: [Qgis-user] Atlas by year

[Alexandre Neto]

You need to create a layer, with a column called year, with each year in a
row. The layer does not need to have a geometry. Use that layer as the
coverage layer for atlas.

For the layer you want to filter by year, create a rule-based symbology,
and use the following rule/expression:

attribute(@atlasfeature, 'yea
r') = "year"

This compares the current atlas feature field year, to the layer year
column, and renders the features only if the years match.

Hope it helps.

Alexandre Neto

A seg, 25/03/2019, 13:50, Marco Antônio Ferreira Pedrosa <
marcomot...@gmail.com> escreveu:

> Hi all,
>
> Sorry if s a silly question!
>
> How to generate an atlas by a value in the attibute table? (i.e: Year).
> QGIS Atlas would generate one map for each attribute value but not group by
> year.
>
> For each year, I want to show the features with a categorized symbology
> (same for all years, but I want to show just the features from that year).
>
> tnks in advance!
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Re: [Qgis-user] F29 + dani-qgis repo update errors

[Daniele Viganò]

Dear Max,

thanks for reporting the issue.
The bug has been already fixed here
https://github.com/qgis/QGIS/pull/9621; a new build is available on COPR
(3.6.1-2).

The issue is however not preventing the installation to work properly.

Cheers,
Daniele

---
Daniele Viganò
http://daniele.vigano.me

On mobile, please excuse my brevity.

On Mon, Mar 25, 2019, 23:02 Max Pyziur  wrote:

>
> Greetings,
>
> When running a Fedora 29 software update, and using the dani-qgis repos,
> the following errors occurred:
>
>Running scriptlet: qgis-grass-3.6.1-1.fc29.x86_64  5/8
>Cleanup  : qgis-server-3.6.1-1.fc29.x86_64   6/8
>Cleanup  : python3-qgis-3.6.1-1.fc29.x86_64  7/8
>Running scriptlet: python3-qgis-3.6.1-1.fc29.x86_64   7/8
> /sbin/ldconfig: relative path `1' used to build cache warning:
> %postun(python3-qgis-3.6.1-1.fc29.x86_64) scriptlet failed, exit status 1
>
> Error in POSTUN scriptlet in rpm package python3-qgis
>Cleanup  : qgis-3.6.1-1.fc29.x86_64
>
>
>
> fyi,
>
> Max Pyziur
> p...@brama.com
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[Qgis-user] F29 + dani-qgis repo update errors

[Max Pyziur]

Greetings,

When running a Fedora 29 software update, and using the dani-qgis repos, 
the following errors occurred:


  Running scriptlet: qgis-grass-3.6.1-1.fc29.x86_64  5/8
  Cleanup  : qgis-server-3.6.1-1.fc29.x86_64   6/8
  Cleanup  : python3-qgis-3.6.1-1.fc29.x86_64  7/8
  Running scriptlet: python3-qgis-3.6.1-1.fc29.x86_64   7/8
/sbin/ldconfig: relative path `1' used to build cache warning: 
%postun(python3-qgis-3.6.1-1.fc29.x86_64) scriptlet failed, exit status 1


Error in POSTUN scriptlet in rpm package python3-qgis
  Cleanup  : qgis-3.6.1-1.fc29.x86_64



fyi,

Max Pyziur
p...@brama.com
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[Qgis-user] Atlas by year

[Marco Antônio Ferreira Pedrosa]

Hi all,

Sorry if s a silly question!

How to generate an atlas by a value in the attibute table? (i.e: Year).
QGIS Atlas would generate one map for each attribute value but not group by
year.

For each year, I want to show the features with a categorized symbology
(same for all years, but I want to show just the features from that year).

tnks in advance!
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Re: [Qgis-user] how to add a jpg figure near points

[Stefan Giese (WhereGroup)]

see this image: 
https://drive.google.com/file/d/1SnYigYmyG8458qbtGanWg5-rrNsv9o_T/view?usp=sharing


---
Mit freundlichen Grüßen
Stefan Giese

Projektleiter/Consultant
---
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---
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Am 2019-03-25 14:18, schrieb Azzurra Lentini:

Dear Lene Fischer thank you for your answer but I dont find it.
So from the layer panel shape file points (click right): properties
and style? but there I dont find "raster image maker"..

Azzurra

Lene Fischer  a écrit :

Under Symbology - you can choose raster image marker. I use it for  
aerial images next to points.

Regards


Lene Fischer
Associate Professor

University of Copenhagen
Department of Geoscience and Natural Resource Management Forest and  
Landscape College Nødebovej 77a

3480 Fredensborg
Denmark

-Oprindelig meddelelse-
Fra: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] På vegne  af 
Azzurra Lentini

Sendt: 24. marts 2019 20:44
Til: qgis-user@lists.osgeo.org
Emne: [Qgis-user] how to add a jpg figure near points

Hi to all,
I would like to add in my project some figures near my points.
I explain better,I have a shapefile of points  that represent some
springs and I would like to associate for every point a figure (jpg
extension for example) that I did with another software (is a  a
diagram used in hydrogeochemistry to show the water composition): so I
would like to see near every point a figure (I think it would be the
same if I wanted to associate a picture).

Thanks to all

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Re: [Qgis-user] how to add a jpg figure near points

[Azzurra Lentini]

Dear Lene Fischer thank you for your answer but I dont find it.
So from the layer panel shape file points (click right): properties  
and style? but there I dont find "raster image maker"..


Azzurra

Lene Fischer  a écrit :

Under Symbology - you can choose raster image marker. I use it for  
aerial images next to points.

Regards


Lene Fischer
Associate Professor

University of Copenhagen
Department of Geoscience and Natural Resource Management Forest and  
Landscape College Nødebovej 77a

3480 Fredensborg
Denmark

-Oprindelig meddelelse-
Fra: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] På vegne  
af Azzurra Lentini

Sendt: 24. marts 2019 20:44
Til: qgis-user@lists.osgeo.org
Emne: [Qgis-user] how to add a jpg figure near points

Hi to all,
I would like to add in my project some figures near my points.
I explain better,I have a shapefile of points  that represent some
springs and I would like to associate for every point a figure (jpg
extension for example) that I did with another software (is a  a
diagram used in hydrogeochemistry to show the water composition): so I
would like to see near every point a figure (I think it would be the
same if I wanted to associate a picture).

Thanks to all

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Re: [Qgis-user] raster smoothing tool?

[Paolo Cavallini]

Hi Nicolas, Yann.
Please remember, if the issue is confirmed, to open a ticket on
https://issues.qgis.org/
Thanks.

On 23/03/19 06:52, Nicolas Cadieux wrote:
> Salut Yann,
> 
> In QGIS, try renaming the output file instead of using the default
> temporary file.  I have had similar problems in the past but I am not
> sure if this is the same thing.  You can try saving as a tif or as
> .sdat.  I had funny results in the past with SAGA when using tif as
> output therefore I had more success saving in SAGA .sdat and then
> exporting that result to a tif afterwards.
> 
> Nice to know you got it working.  SAGA is nice and has rich algorithm
> but has the nasty habit of loading massive amounts of data to memory.
>  This makes it faster if you can take the memory hit.
> 
> Au plaisir!
> Nicolas
> 
> 
> Le 22 mars 2019 à 22:45, Yann Troutet  > a écrit :
> 
>> Merci Nicolas,
>>
>> I had tried the Vigra Smoothing tool from SAGA, but this simply raises
>> the following error message:
>>
>> The following layers were not correctly
>> generated.C:/Users/ytroutet/AppData/Local/Temp/processing_f62d6fcc634e4d53945b3b999d33eb65/fabcc06c819f4f7684ec3ba0a75d6a0d/OUTPUT.sdatYou
>> can check the 'Log Messages Panel' in QGIS main window to find more
>> information about the execution of the algorithm.
>>
>> I'm using QGIS 3.4.4. Madeira and have mostly been attempting to run
>> r.resamp.filter kernel filters. This process just outputs a new raster
>> layer with the same pixels values, even though I've tried different
>> 'radius' values.
>>
>> I've just looked at the SAGA simple filter, and this worked just fine.
>>
>> Une fois de plus merci de m'avoir suggéré les options du côté de SAGA.
>>
>> yann
>> >>> Nicolas Cadieux > >>> >
>> 3/22/2019 6:26 PM >>>
>> Hi,
>>
>> That is weird.  There are low pass filter in processing.  Try one from
>> Saga.  Then open Saga and try again.  Compare both.  If you get the
>> same results, you will know the problem is from Saga or the raster but
>> not from QGIS.  Then write back with the exact version of QGIS you are
>> using, on what platform (OS, Linux, Windows...) and what algorithm you
>> are trying. This should help us figure things out.
>>
>> Nicolas
>>
>> Le 22 mars 2019 à 20:27, Yann Troutet > > a écrit :
>>
>>> Hello,
>>>
>>> Are there any raster smoothing (low-pass filtering) tools that will
>>> work in QGIS 3.  Every option that I try simply outputs a raster that
>>> has the exact same values as the original.
>>>
>>>
>>> -- 
>>> This message has been scanned for viruses and dangerous content by
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-- 
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[Qgis-user] grid creation after points analysis

[Eugenio Trumpy]

Hi all,

I want to know if it is possible to create a model which has to to do the 
following:

  1.  import a points layer (A)
  2.  analyse the A with a cell 100x100 km moving it with a 25 km step
  3.  on each step (25km) a statistical analysis of the points falling in the 
100x100 km cell has to be performed --> the statistical analysis has to do: a 
histogram in frequency classes (so a point attribute has to be divided in 
classes and for each class the points have to be counted) the output is the 
value of the class where the 90% of the points fall.
  4.  this analysis has to be replicated for each 25km step on X and Y
  5.  the result should be a matrix 25km spaced on x and y where the cell value 
is the point attribute value of the 90%

Is it possible with the available function in the QGIS toolbox? or it is 
necessary the develop a custom function/plugin?

Thanks for any hints you can give me...

Eugenio
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[Qgis-user] WG: Aggregation of adjacent polygons of the same type

[Sven Böhme - empirica]

-Ursprüngliche Nachricht-
Von: Sven Böhme - empirica 
Gesendet: Montag, 25. März 2019 10:25
An: 'Stefan Giese (WhereGroup)' 
Betreff: AW: [Qgis-user] Aggregation of adjacent polygons of the same type

Hi Stefan,

maybe this helps to clarify the problem...

Thanks a lot
Sven



-Ursprüngliche Nachricht-
Von: Stefan Giese (WhereGroup) 
Gesendet: Montag, 25. März 2019 10:11
An: Sven Böhme - empirica 
Cc: qgis-user@lists.osgeo.org
Betreff: Re: [Qgis-user] Aggregation of adjacent polygons of the same type

Hi Sven,
can you specify your question: what is unclear and where exactly do you need 
support for?

best regards
stefan
---
Mit freundlichen Grüßen
Stefan Giese

Projektleiter/Consultant
---
Aufwind durch Wissen!
Qualifizierte Open-Source-Schulungen
bei der www.foss-academy.com
---
WhereGroup GmbH & Co. KG
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79100 Freiburg
Germany

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

stefan.gi...@wheregroup.com
www.wheregroup.com
Amtsgericht Bonn, HRA 6788
---
Komplementärin:
WhereGroup Verwaltungs GmbH
vertreten durch:
Olaf Knopp, Peter Stamm
---

Am 2019-03-25 10:04, schrieb Sven Böhme - empirica:
> Hi!
> 
> I'm trying to aggregate neighboring polygons based on additional 
> conditions. These are:
> 
> - the polygons must be adjacent
> 
> - the polygons must be of the same type (simple value from attribute)
> 
> - the polygons should only be combined if the values of an attribute x 
> are below a certain value AND
> 
> - the polygons shall be merged with other polygons until this value is 
> reached
> 
> The polygons are grids. Aggregation should not necessarily lead to new 
> squares (as in the Quadtree-method).
> 
> I use PostGIS to store the data and QGIS for visualization and further 
> processing. For performance reasons I suspect that a 
> database-supported procession makes sense, but if QGIS (GDAL,GRASS
> etc.) offers a function, I would like to try it out.
> 
> I would be happy about support
> 
> Best regards
> 
> Sven
> 
> 
> 
> empirica ag
> 
> Sven Böhme
> 
> Kaiserstraße 29
> 
> 53113 Bonn
> Fon +49 (0)228 91489-90
> 
> Fax +49 (0)3222 95 66 169
> 
> www.empirica-institut.de [1]
> 
> empirica ag - Zweigniederlassung Bonn - HRB 87951 Amtsgericht 
> Charlottenburg
> 
> Vorstand: Dr. Marie-Therese Krings-Heckemeier (Vorsitzende),
> 
> Ludger Baba, Dr. Reiner Braun (stellv. Vors.), Meike Heckenroth, Prof.
> Dr. Harald Simons
> 
> Aufsichtsratsvorsitzender: Klaus Arndt
> 
> KOSTENLOSER NEWSLETTER VON EMPIRICA. JETZT ANMELDEN:
> 
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Re: [Qgis-user] Aggregation of adjacent polygons of the same type

[Stefan Giese (WhereGroup)]

Hi Sven,
can you specify your question: what is unclear and where exactly do you 
need support for?


best regards
stefan
---
Mit freundlichen Grüßen
Stefan Giese

Projektleiter/Consultant
---
Aufwind durch Wissen!
Qualifizierte Open-Source-Schulungen
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---
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79100 Freiburg
Germany

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

stefan.gi...@wheregroup.com
www.wheregroup.com
Amtsgericht Bonn, HRA 6788
---
Komplementärin:
WhereGroup Verwaltungs GmbH
vertreten durch:
Olaf Knopp, Peter Stamm
---

Am 2019-03-25 10:04, schrieb Sven Böhme - empirica:

Hi!

I'm trying to aggregate neighboring polygons based on additional
conditions. These are:

- the polygons must be adjacent

- the polygons must be of the same type (simple value from attribute)

- the polygons should only be combined if the values of an attribute x
are below a certain value AND

- the polygons shall be merged with other polygons until this value is
reached

The polygons are grids. Aggregation should not necessarily lead to new
squares (as in the Quadtree-method).

I use PostGIS to store the data and QGIS for visualization and further
processing. For performance reasons I suspect that a
database-supported procession makes sense, but if QGIS (GDAL,GRASS
etc.) offers a function, I would like to try it out.

I would be happy about support

Best regards

Sven



empirica ag

Sven Böhme

Kaiserstraße 29

53113 Bonn
Fon +49 (0)228 91489-90

Fax +49 (0)3222 95 66 169

www.empirica-institut.de [1]

empirica ag - Zweigniederlassung Bonn - HRB 87951 Amtsgericht
Charlottenburg

Vorstand: Dr. Marie-Therese Krings-Heckemeier (Vorsitzende),

Ludger Baba, Dr. Reiner Braun (stellv. Vors.), Meike Heckenroth, Prof.
Dr. Harald Simons

Aufsichtsratsvorsitzender: Klaus Arndt

KOSTENLOSER NEWSLETTER VON EMPIRICA. JETZT ANMELDEN:

https://www.empirica-institut.de/newsletter-anmelden/ [2]
Diese E-Mail enthält vertrauliche und/oder rechtlich geschützte
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[Qgis-user] Aggregation of adjacent polygons of the same type

[Sven Böhme - empirica]

Hi!

I'm trying to aggregate neighboring polygons based on additional conditions. 
These are:

- the polygons must be adjacent
- the polygons must be of the same type (simple value from attribute)
- the polygons should only be combined if the values of an attribute x are 
below a certain value AND
- the polygons shall be merged with other polygons until this value is reached

The polygons are grids. Aggregation should not necessarily lead to new squares 
(as in the Quadtree-method).

I use PostGIS to store the data and QGIS for visualization and further 
processing. For performance reasons I suspect that a database-supported 
procession makes sense, but if QGIS (GDAL,GRASS etc.) offers a function, I 
would like to try it out.

I would be happy about support

Best regards
Sven



empirica ag
Sven Böhme
Kaiserstraße 29
53113 Bonn
Fon +49 (0)228 91489-90
Fax +49 (0)3222 95 66 169
www.empirica-institut.de

empirica ag - Zweigniederlassung Bonn - HRB 87951 Amtsgericht Charlottenburg
Vorstand: Dr. Marie-Therese Krings-Heckemeier (Vorsitzende),
Ludger Baba, Dr. Reiner Braun (stellv. Vors.), Meike Heckenroth, Prof. Dr. 
Harald Simons
Aufsichtsratsvorsitzender: Klaus Arndt

Kostenloser Newsletter von empirica. Jetzt anmelden:
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Re: [Qgis-user] QField: recommendations for aerial basemap preparation?

[Bernd Vogelgesang]

Hi Wouter,

unfortuantely, the area is located in Germany, well-known for its
horrible mobile networks coverages. There are some spots where you even
can't make SOS-calls.

So for the years to come WMS, is a bad to no option. But I'll give it a try.

Cheers,

Bernd

Am 25.03.19 um 09:44 schrieb Wouter Impens:

Hi Bernd,

It's possible to load a WMS layer in your project for Q-field, maybe
that's a solution?
But then of course you need an internet connection all the time...

Greetings
Wouter

Op zo 24 mrt. 2019 om 21:37 schreef Bernd Vogelgesang
mailto:bernd.vogelges...@gmx.de>>:

Hi,

I need an aerial basemap for my QField-project to be able to locate
positions. As QField has not the ability to navigate to a point or
indicate the direction of movement, provided only with a topographic
basemap, I'm stumbling through the forest and have a hard time finding
the positions.

The project area is huge, around 400 square kilometers! I have a Mrsid
file of the area of 1.6 GB with 20 centimeter resolution,
transformed with gdal_translate to tiff is 42.5 GB,
compressed with gdal_transform with jped-compression 50% 968 MB,
resampled to 40cm resolution and 50% jpeg has 295 MB

I used the QField sync plugin to generate a baselayer in gpgk-format
from this ,which has 540 MB with 40 cm resolution.

Unfortunately, on the tablet, the baselayer is loading so slow,
that it
is impossible to work with it. Each redraw takes around 10 seconds in
the small scale, rising to infinity in higher scales.

I wonder if there are other approaches recommendable, for example
splitting the image into separate layers for bigger regions, which I
could then turn on and off, or if I should prepare the image apart
from
using the plugins converter to gpkg.

Due to the enourmous amount of time needed to process the image on the
PC, a trial-and-error approach seems not to be feasable, so I ask
you if
someone can recommend an approach for such a huge beast.


Thanx in advance,

Bernd

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Re: [Qgis-user] QField: recommendations for aerial basemap preparation?

[Wouter Impens]

Hi Bernd,

It's possible to load a WMS layer in your project for Q-field, maybe that's
a solution?
But then of course you need an internet connection all the time...

Greetings
Wouter

Op zo 24 mrt. 2019 om 21:37 schreef Bernd Vogelgesang <
bernd.vogelges...@gmx.de>:

> Hi,
>
> I need an aerial basemap for my QField-project to be able to locate
> positions. As QField has not the ability to navigate to a point or
> indicate the direction of movement, provided only with a topographic
> basemap, I'm stumbling through the forest and have a hard time finding
> the positions.
>
> The project area is huge, around 400 square kilometers! I have a Mrsid
> file of the area of 1.6 GB with 20 centimeter resolution,
> transformed with gdal_translate to tiff is 42.5 GB,
> compressed with gdal_transform with jped-compression 50% 968 MB,
> resampled to 40cm resolution and 50% jpeg has 295 MB
>
> I used the QField sync plugin to generate a baselayer in gpgk-format
> from this ,which has 540 MB with 40 cm resolution.
>
> Unfortunately, on the tablet, the baselayer is loading so slow, that it
> is impossible to work with it. Each redraw takes around 10 seconds in
> the small scale, rising to infinity in higher scales.
>
> I wonder if there are other approaches recommendable, for example
> splitting the image into separate layers for bigger regions, which I
> could then turn on and off, or if I should prepare the image apart from
> using the plugins converter to gpkg.
>
> Due to the enourmous amount of time needed to process the image on the
> PC, a trial-and-error approach seems not to be feasable, so I ask you if
> someone can recommend an approach for such a huge beast.
>
>
> Thanx in advance,
>
> Bernd
>
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Re: [Qgis-user] QField: recommendations for aerial basemap preparation?

[Matthias Kuhn]

Hi,

There is a gis stackexchange question open regarding this which has some
good inputs to consider.

https://gis.stackexchange.com/questions/309379/choosing-raster-format-for-qfield

There is also some information in the QField documentation regarding
this topic (although that could benefit from some improvements from your
findings, there's an edit on github link at the bottom of the page ;) )

https://www.qfield.org/docs/project-management/dataformat.html#raster-data

Best regards

Matthias

On 3/24/19 9:37 PM, Bernd Vogelgesang wrote:
> Hi,
>
> I need an aerial basemap for my QField-project to be able to locate
> positions. As QField has not the ability to navigate to a point or
> indicate the direction of movement, provided only with a topographic
> basemap, I'm stumbling through the forest and have a hard time finding
> the positions.
>
> The project area is huge, around 400 square kilometers! I have a Mrsid
> file of the area of 1.6 GB with 20 centimeter resolution,
> transformed with gdal_translate to tiff is 42.5 GB,
> compressed with gdal_transform with jped-compression 50% 968 MB,
> resampled to 40cm resolution and 50% jpeg has 295 MB
>
> I used the QField sync plugin to generate a baselayer in gpgk-format
> from this ,which has 540 MB with 40 cm resolution.
>
> Unfortunately, on the tablet, the baselayer is loading so slow, that it
> is impossible to work with it. Each redraw takes around 10 seconds in
> the small scale, rising to infinity in higher scales.
>
> I wonder if there are other approaches recommendable, for example
> splitting the image into separate layers for bigger regions, which I
> could then turn on and off, or if I should prepare the image apart from
> using the plugins converter to gpkg.
>
> Due to the enourmous amount of time needed to process the image on the
> PC, a trial-and-error approach seems not to be feasable, so I ask you if
> someone can recommend an approach for such a huge beast.
>
>
> Thanx in advance,
>
> Bernd
>
> ___
> 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
>
-- 
Matthias Kuhn
matth...@opengis.ch 
+41 (0)76 435 67 63 
OPENGIS.ch Logo 
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Re: [Qgis-user] how to add a jpg figure near points

[Lene Fischer]

Under Symbology - you can choose raster image marker. I use it for aerial 
images next to points.
Regards


Lene Fischer
Associate Professor

University of Copenhagen
Department of Geoscience and Natural Resource Management Forest and Landscape 
College Nødebovej 77a
3480 Fredensborg
Denmark

-Oprindelig meddelelse-
Fra: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] På vegne af Azzurra 
Lentini
Sendt: 24. marts 2019 20:44
Til: qgis-user@lists.osgeo.org
Emne: [Qgis-user] how to add a jpg figure near points

Hi to all,
I would like to add in my project some figures near my points.
I explain better,I have a shapefile of points  that represent some  
springs and I would like to associate for every point a figure (jpg  
extension for example) that I did with another software (is a  a  
diagram used in hydrogeochemistry to show the water composition): so I  
would like to see near every point a figure (I think it would be the  
same if I wanted to associate a picture).

Thanks to all

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