Re: [Qgis-user] qgis/postgis : flow map

[Casper Bertelsen]

To understand you correct:

In your raw-data table entrants you have one row for each person and in 
your query you want one flow for each person, ie. the same number of 
rows in your output?


In the regards to the group by, you want the sum(ipondi) on each flow 
where they're grouped by a specific field?


Is the above understood correctly?

(The way aggregates work is that you need to group by all 
non-aggregrate, so it will find all unique combinations of the other 
fields in the query and sum based on those.)


Mvh. / Best regards
Casper Bertelsen

Mail: casperb...@gmail.com

On 03-02-2018 21:07, image wrote:

So, i succeed in executing the query without error message. The query
generates a temp postgis layer linear.
I attach the SS below showing the qgis canvas



But i have always a problem regarding the GROUP BY...i would like to do a
GROUP BY one field only...but i can't generate the query without put all
fields present in SELECT into GROUP BY !

Please read my currently query :

create table temp as select
st_makeline(st_makepoint(entrants_v2.x_resi,entrants_v2.y_resi),st_makepoint(entrants_v2.x_tr,entrants_v2.y_tr))as
geometry,sum(entrants_v2.ipondi) as sumipondi, entrants_v2.codgeo_res as
codgeo_res, entrants_v2.codgeo_tr as codgeo_tr

from entrants_v2
group by
entrants_v2.codgeo_res,entrants_v2.x_resi,entrants_v2.y_resi,entrants_v2.x_tr,entrants_v2.y_tr,entrants_v2.ipondi,entrants_v2.codgeo_tr

Is it a way to assign one field into group by with postgis? Because my
result is false.
In advance, thank you very much.



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Re: [Qgis-user] Idea: Crowd-sourcing a batch-georeferencer plugin withQR code ?

[Bernd Vogelgesang]

Am 03.02.2018, 23:35 Uhr, schrieb Nyall Dawson :

On 4 February 2018 at 06:32, Alex Mandel   
wrote:

I think you undervalue what's been done. See the code base, and
re-use/adapt whatever components you want. You can run your own custom
version.

https://github.com/fieldpapers

Could even integrate it with QGIS as a plugin, or flip that around and
use QGIS server to create the tile layer used in the background.


Hmm, let's do the math:

- QGIS 3.0 composer adds support for plugin-based item types, allowing
Python plugins to add new items to a layout
- fieldpapers is open source, so easy to see and reproduce the logic
regarding what's embedded in those QR codes
- there's existing Python libraries for QR codes as images, which
could then easily be rendered inside a QGIS 3.0 QgsLayoutItem subclass


Ermm, well, obviously!



Go forth magic QGIS plugin authoring elves! Do your thing!


So, how much time will those elves need to accomplish such a task, how  
much does an elve charge an hour, and most important, where do such elves  
live?


Nyall



--
Bernd Vogelgesang
Siedlerstraße 2
91083 Baiersdorf/Igelsdorf
Tel: 09133-825374
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Re: [Qgis-user] Print Composer Templates in v2_99

[Nyall Dawson]

On 3 February 2018 at 09:28, Grant Boxer  wrote:
> I am trying to apply/use a template in print composer from v.2.18.16 but
> v2_99 does not seem to able to display it. Do we need to re-create our
> templates for the new version?
>

It's just an oversight. I'll fix.

Nyall
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Re: [Qgis-user] Profiles

[Nyall Dawson]

On 3 February 2018 at 17:48, Saber Razmjooei
 wrote:
> Hi Paolo,
>
> Each of those profile tools uses a different library for plotting.
>
> I think for migration to QGIS 3, it is best to use Qt Charts module which
> has been GPLed since Qt 5.7:
>
> http://doc.qt.io/QtCharts/
>
> IMO, profile tool should be a core QGIS function.

+1 billion.

Related features which should be added at the same time:
- Allow the chart to show a profile of a line from existing z (or m)
values (e.g. no raster dem required)
- A processing algorithm to set z/m values in a line/point/polygon
from a raster band

Nyall


>
> Regards
> Saber
>
> On 1 Feb 2018 12:53, "Paolo Cavallini"  wrote:
>>
>> Hi all,
>> while revising featured plugins, I checked the current situation with
>> plugins dealing with profiles.
>> Currently searching for profile
>> http://plugins.qgis.org/search/?q=profile
>>
>> returns the following:
>>
>>  [87] Profile tool
>>
>> [625] ProfileFromPoints
>>
>> [789] swath profile
>>
>> [609] Temporal/Spectral Profile Tool
>>
>> [33] Profile from Line
>>
>> [294] qProf
>>
>> [376] VoGIS-ProfilTool
>>
>> [127] EarthBeat
>>
>> [1240] Geo Picker
>>
>> [407] geopunt4Qgis
>>
>> There is obviously a large overlap between many of them. We already
>> analysed this long ago, and things have not improved.
>> I will be grateful if users:
>> * could confirm which of the bunch they find most useful
>> * could confirm whether some of them should be deprecated because it is
>> not working well
>> * would help identifying areas of overlap, and help me convincing
>> authors to merge their work, possibly in just one plugin, better if
>> within Processing.
>> All the best, and thanks.
>> --
>> Paolo Cavallini - www.faunalia.eu
>> QGIS & PostGIS courses: http://www.faunalia.eu/training.html
>> https://www.google.com/trends/explore?date=all=IT=qgis,arcgis
>> ___
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Re: [Qgis-user] Idea: Crowd-sourcing a batch-georeferencer plugin withQR code ?

[Nyall Dawson]

On 4 February 2018 at 06:32, Alex Mandel  wrote:
> I think you undervalue what's been done. See the code base, and
> re-use/adapt whatever components you want. You can run your own custom
> version.
>
> https://github.com/fieldpapers
>
> Could even integrate it with QGIS as a plugin, or flip that around and
> use QGIS server to create the tile layer used in the background.

Hmm, let's do the math:

- QGIS 3.0 composer adds support for plugin-based item types, allowing
Python plugins to add new items to a layout
- fieldpapers is open source, so easy to see and reproduce the logic
regarding what's embedded in those QR codes
- there's existing Python libraries for QR codes as images, which
could then easily be rendered inside a QGIS 3.0 QgsLayoutItem subclass

Go forth magic QGIS plugin authoring elves! Do your thing!

Nyall
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Re: [Qgis-user] Idea: Crowd-sourcing a batch-georeferencer plugin withQR code ?

[Alex Mandel]

I think you undervalue what's been done. See the code base, and
re-use/adapt whatever components you want. You can run your own custom
version.

https://github.com/fieldpapers

Could even integrate it with QGIS as a plugin, or flip that around and
use QGIS server to create the tile layer used in the background.

-Alex

On 02/03/2018 11:49 AM, Bernd Vogelgesang wrote:
> Thanx guys for the hint,
> but this is a "serious" project ;)
> 
> My detail maps I have to produce are scattered around an area of ca. 200
> sqkm, I want to have the freedom to design everything I want to with
> overview maps for finding the spot, inserting already existing data etc.
> So fieldpapers.org is nice, but doesn't bring me any convenience in my
> QGIS-workflows.
> 
> Cheers
> Bernd
> 
> Am 03.02.2018, 19:57 Uhr, schrieb Clifford Snow :
> 
>> Let me echo Brent Fraser suggestion to look at Field Papers,
>> fieldpaper.org. They accomplish what you are looking for. Each page
>> >of the field paper has a QR code for georeferencing. Not only that
>> they can be loaded in as a baselayer in OSM editors. The site
>> >fieldpapers.org has a simple walk through on how to go from nothing
>> to pages loaded in for digitizing.
>>
>> If you are going to use Field Papers with different surveyors from
>> those who digitize the results, make sure you have a common
>> >understanding of symbols and notation the surveyors use. Otherwise
>> digitizing may be limited.
>>
>> Hope this helps.
>>
>> Clifford
>>
>> On Sat, Feb 3, 2018 at 10:12 AM, Brent Fraser
>>  wrote:
> Bernd,
>>> Have you looked at Field Papers?  http://fieldpapers.org/
>>> Best Regards,
>>> Brent Fraser
>>> From: "Bernd Vogelgesang" 
>>> Sent: Saturday, February 3, 2018 9:22 AM
>>> To: "qgis-user@lists.osgeo.org" 
>>> Subject: [Qgis-user] Idea: Crowd-sourcing a batch-georeferencer
>>> plugin withQR code ?
>>> Hi folks,
>>>
>>> I am facing a project, where I will produce hundreds of field maps with
>>> atlas from lots of small locations, which get printed for surveyors to
>>> fill in observations in the field.
>>> Getting them returned, I need to scan them, georeference them and
>>> finally
>>> digitize the features found.
>>> Alone thinking of the process of georeferencing all those scans (which
>>> might only have tiny offsets and shifts because of lousy scanners)
>>> make me
>>> wish to have chosen another profession ...
>>>
>>> So here is the idea:
>>> An atlas plugin, that will automatically distribute minimum 6
>>> cross-hairs
>>> (or other automatically identifiable features) around your atlas canvas.
>>> A QR-Code is generated, which holds the coordinates, EPSG and name of
>>> the
>>> atlasfeature, and which is put in some restricted area of the
>>> composer map.
>>> Maps are printed, processed and scanned afterwards.
>>> Batch-import all scans.
>>> Another function reads the QR-Code of the scan, identifies to locator
>>> features, gives them the proper coordinates and automatically creates
>>> georeferenced tiff/png/jpg with the name of the atlas feature.
>>>
>>> Sounds like a dream, but I think there should be enough dreamers
>>> around to
>>> make this one true.
>>>
>>> Any ideas if this will work, and how to start this endeavour?
>>>
>>> Cheers,
>>> Bernd
>>>
>>>
>>> -- 
>>> Bernd Vogelgesang
>>> Siedlerstraße 2
>>> 91083 Baiersdorf/Igelsdorf
>>> Tel: 09133-825374
>>> ___
>>> Qgis-user mailing list
>>> Qgis-user@lists.osgeo.org
>>> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
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>>
>>
>>
>> --@osm_seattle
>> osm_seattle.snowandsnow.us
>> OpenStreetMap: Maps with a human touch
> 
> 
> 
> 
> 
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Re: [Qgis-user] qgis/postgis : flow map

[image]

So, i succeed in executing the query without error message. The query
generates a temp postgis layer linear. 
I attach the SS below showing the qgis canvas

 

But i have always a problem regarding the GROUP BY...i would like to do a
GROUP BY one field only...but i can't generate the query without put all
fields present in SELECT into GROUP BY !

Please read my currently query : 

create table temp as select
st_makeline(st_makepoint(entrants_v2.x_resi,entrants_v2.y_resi),st_makepoint(entrants_v2.x_tr,entrants_v2.y_tr))as
geometry,sum(entrants_v2.ipondi) as sumipondi, entrants_v2.codgeo_res as
codgeo_res, entrants_v2.codgeo_tr as codgeo_tr

from entrants_v2
group by
entrants_v2.codgeo_res,entrants_v2.x_resi,entrants_v2.y_resi,entrants_v2.x_tr,entrants_v2.y_tr,entrants_v2.ipondi,entrants_v2.codgeo_tr

Is it a way to assign one field into group by with postgis? Because my
result is false. 
In advance, thank you very much. 



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[Qgis-user] Fwd: Re: Idea: Crowd-sourcing a batch-georeferencer plugin with QR code ?

[Bernd Vogelgesang]

--- Weitergeleitete Nachricht ---
Von: "Saber Razmjooei" 
An: "Bernd Vogelgesang" 
Kopi

Maybe you can use a mobile/tablet device with (Q)GIS to collect data, so  
no need to georeferencing and digitizing.


Maybe "I" could use mobile devices for that job. But I am talking about a  
species called "biologists" which is doing that work, with century-old  
habits ;)

So paper is a must, digital tools are goodies on top.

Cheers
Bernd

Regards
Saber



On 3 Feb 2018 16:22, "Bernd Vogelgesang"  wrote:

Hi folks,

I am facing a project, where I will produce hundreds of field maps with  
atlas from lots of small locations, which get printed for >surveyors to  
fill in observations in the field.
Getting them returned, I need to scan them, georeference them and  
finally digitize the features found.
Alone thinking of the process of georeferencing all those scans (which  
might only have tiny offsets and shifts because of lousy >scanners) make  
me wish to have chosen another profession ...


So here is the idea:
An atlas plugin, that will automatically distribute minimum 6  
cross-hairs (or other automatically identifiable features) around >your  
atlas canvas.
A QR-Code is generated, which holds the coordinates, EPSG and name of  
the atlasfeature, and which is put in some restricted area >of the  
composer map.

Maps are printed, processed and scanned afterwards.
Batch-import all scans.
Another function reads the QR-Code of the scan, identifies to locator  
features, gives them the proper coordinates and >automatically creates  
georeferenced tiff/png/jpg with the name of the atlas feature.


Sounds like a dream, but I think there should be enough dreamers around  
to make this one true.


Any ideas if this will work, and how to start this endeavour?

Cheers,
Bernd


--Bernd Vogelgesang
Siedlerstraße 2
91083 Baiersdorf/Igelsdorf
Tel: 09133-825374
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Re: [Qgis-user] Idea: Crowd-sourcing a batch-georeferencer plugin withQR code ?

[Bernd Vogelgesang]

Thanx guys for the hint,
but this is a "serious" project ;)

My detail maps I have to produce are scattered around an area of ca. 200  
sqkm, I want to have the freedom to design everything I want to with  
overview maps for finding the spot, inserting already existing data etc.
So fieldpapers.org is nice, but doesn't bring me any convenience in my  
QGIS-workflows.


Cheers
Bernd

Am 03.02.2018, 19:57 Uhr, schrieb Clifford Snow :

Let me echo Brent Fraser suggestion to look at Field Papers,  
fieldpaper.org. They accomplish what you are looking for. Each page >of  
the field paper has a QR code for georeferencing. Not only that they can  
be loaded in as a baselayer in OSM editors. The site >fieldpapers.org  
has a simple walk through on how to go from nothing to pages loaded in  
for digitizing.


If you are going to use Field Papers with different surveyors from those  
who digitize the results, make sure you have a common >understanding of  
symbols and notation the surveyors use. Otherwise digitizing may be  
limited.


Hope this helps.

Clifford

On Sat, Feb 3, 2018 at 10:12 AM, Brent Fraser   
wrote:

Bernd,

Have you looked at Field Papers?  http://fieldpapers.org/
Best Regards,
Brent Fraser
From: "Bernd Vogelgesang" 
Sent: Saturday, February 3, 2018 9:22 AM
To: "qgis-user@lists.osgeo.org" 
Subject: [Qgis-user] Idea: Crowd-sourcing a batch-georeferencer plugin  
withQR code ?

Hi folks,

I am facing a project, where I will produce hundreds of field maps with
atlas from lots of small locations, which get printed for surveyors to
fill in observations in the field.
Getting them returned, I need to scan them, georeference them and  
finally

digitize the features found.
Alone thinking of the process of georeferencing all those scans (which
might only have tiny offsets and shifts because of lousy scanners) make  
me

wish to have chosen another profession ...

So here is the idea:
An atlas plugin, that will automatically distribute minimum 6  
cross-hairs

(or other automatically identifiable features) around your atlas canvas.
A QR-Code is generated, which holds the coordinates, EPSG and name of  
the
atlasfeature, and which is put in some restricted area of the composer  
map.

Maps are printed, processed and scanned afterwards.
Batch-import all scans.
Another function reads the QR-Code of the scan, identifies to locator
features, gives them the proper coordinates and automatically creates
georeferenced tiff/png/jpg with the name of the atlas feature.

Sounds like a dream, but I think there should be enough dreamers around  
to

make this one true.

Any ideas if this will work, and how to start this endeavour?

Cheers,
Bernd


--
Bernd Vogelgesang
Siedlerstraße 2
91083 Baiersdorf/Igelsdorf
Tel: 09133-825374
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--@osm_seattle
osm_seattle.snowandsnow.us
OpenStreetMap: Maps with a human touch




--
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Siedlerstraße 2
91083 Baiersdorf/Igelsdorf
Tel: 09133-825374___
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Re: [Qgis-user] Idea: Crowd-sourcing a batch-georeferencer plugin withQR code ?

[Clifford Snow]

Let me echo Brent Fraser suggestion to look at Field Papers, fieldpaper.org.
They accomplish what you are looking for. Each page of the field paper has
a QR code for georeferencing. Not only that they can be loaded in as a
baselayer in OSM editors. The site fieldpapers.org has a simple walk
through on how to go from nothing to pages loaded in for digitizing.

If you are going to use Field Papers with different surveyors from those
who digitize the results, make sure you have a common understanding of
symbols and notation the surveyors use. Otherwise digitizing may be limited.

Hope this helps.

Clifford

On Sat, Feb 3, 2018 at 10:12 AM, Brent Fraser 
wrote:

> Bernd,
>
>   Have you looked at Field Papers?  http://fieldpapers.org/
>
> Best Regards,
> Brent Fraser
>
>
>
>
> --
> *From*: "Bernd Vogelgesang" 
> *Sent*: Saturday, February 3, 2018 9:22 AM
> *To*: "qgis-user@lists.osgeo.org" 
> *Subject*: [Qgis-user] Idea: Crowd-sourcing a batch-georeferencer plugin
> withQR code ?
>
> Hi folks,
>
> I am facing a project, where I will produce hundreds of field maps with
> atlas from lots of small locations, which get printed for surveyors to
> fill in observations in the field.
> Getting them returned, I need to scan them, georeference them and finally
> digitize the features found.
> Alone thinking of the process of georeferencing all those scans (which
> might only have tiny offsets and shifts because of lousy scanners) make me
> wish to have chosen another profession ...
>
> So here is the idea:
> An atlas plugin, that will automatically distribute minimum 6 cross-hairs
> (or other automatically identifiable features) around your atlas canvas.
> A QR-Code is generated, which holds the coordinates, EPSG and name of the
> atlasfeature, and which is put in some restricted area of the composer map.
> Maps are printed, processed and scanned afterwards.
> Batch-import all scans.
> Another function reads the QR-Code of the scan, identifies to locator
> features, gives them the proper coordinates and automatically creates
> georeferenced tiff/png/jpg with the name of the atlas feature.
>
> Sounds like a dream, but I think there should be enough dreamers around to
> make this one true.
>
> Any ideas if this will work, and how to start this endeavour?
>
> Cheers,
> Bernd
>
>
> --
> Bernd Vogelgesang
> Siedlerstraße 2
> 91083 Baiersdorf/Igelsdorf
> Tel: 09133-825374
> ___
> Qgis-user mailing list
> Qgis-user@lists.osgeo.org
> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
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-- 
@osm_seattle
osm_seattle.snowandsnow.us
OpenStreetMap: Maps with a human touch
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Re: [QGIS-it-user] differenza tra vettori poligonali

[nino formica]

Si ok, ma continuo a non capire (... sono un po' duro) cosa c'entra la
tolleranza col fatto che l'unione genera una terza geometria con area nulla
!?

Nino

Il 03 feb 2018 7:20 PM, "Totò"  ha scritto:

> skampus wrote
> > Se ne era parlato qua.
> >
> > http://gfoss-geographic-free-and-open-source-software-
> italian-mailing.3056002.n2.nabble.com/Risoluzione-
> spaziale-dataset-td7585941i20.html#a7586670
>
> Avevo completamente dimenticato questo thread: Stefano, hai una memoria di
> ferro!!!
>
> La cosa rimane comunque parecchio imbarazzante, difficile da far capire ai
> neofiti che subito trarranno una conclusione negativa sull'uso di sw OS; si
> dovrebbe adottare la stessa tecnica dei SW proprietari, cioè adottare delle
> tolleranze su queste operazioni.
>
> grazie Stefano!!!
>
>
>
> -
> https://pigrecoinfinito.wordpress.com/
> --
> Sent from: http://osgeo-org.1560.x6.nabble.com/QGIS-Italian-User-
> f5250612.html
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Re: [Qgis-user] qgis/postgis : flow map

[image]

Thanks...so...i did a cast from STRING to BIGINT for my X/Y (x/yhome and
x/ywork). 
And i executed this query :

create table test as select
st_makeline(st_makepoint(entrants_only.x_resi,entrants_only.y_resi),st_makepoint(entrants_only.x_tr,entrants_only.y_tr))
as geometry,sum(entrants_only.ipondi) as sumipondi, entrants_only.codgeo_res
as codgeo_res, entrants_only.codgeo_tr as codgeo_tr

from entrants_only
group by entrants_only.codgeo_res, entrants_only.x_resi,
entrants_only.y_resi,entrants_only.x_tr,entrants_only.y_tr,
entrants_only.codgeo_tr

For the first time, the query working without error message...but is working
provided that before I put all my fields present in SELECT part into the
GROUP BY...? Unfortunatly, this condition alters fullymy result, no? because
I want to group only by the field codegeo_res, no by all fields...

So, i load the temp postgis table via qgis...the line layer appears...it
seems ok for the location of my home points...but points work location seems
to be false (south hemisphere!)...
i paste below a SS showing the query and result 

:

 
In advance, thank you for your usefull help...









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Re: [QGIS-it-user] differenza tra vettori poligonali

[Totò]

skampus wrote
> Se ne era parlato qua.
> 
> http://gfoss-geographic-free-and-open-source-software-italian-mailing.3056002.n2.nabble.com/Risoluzione-spaziale-dataset-td7585941i20.html#a7586670

Avevo completamente dimenticato questo thread: Stefano, hai una memoria di
ferro!!!

La cosa rimane comunque parecchio imbarazzante, difficile da far capire ai
neofiti che subito trarranno una conclusione negativa sull'uso di sw OS; si
dovrebbe adottare la stessa tecnica dei SW proprietari, cioè adottare delle
tolleranze su queste operazioni.

grazie Stefano!!! 



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Re: [Qgis-user] Idea: Crowd-sourcing a batch-georeferencer plugin withQR code ?

[Brent Fraser]

Bernd,

   Have you looked at Field Papers?  http://fieldpapers.org/

 Best Regards,
 Brent Fraser






 From: "Bernd Vogelgesang" 
Sent: Saturday, February 3, 2018 9:22 AM
To: "qgis-user@lists.osgeo.org" 
Subject: [Qgis-user] Idea: Crowd-sourcing a batch-georeferencer plugin withQR 
code ?
Hi folks,

I am facing a project, where I will produce hundreds of field maps with
atlas from lots of small locations, which get printed for surveyors to
fill in observations in the field.
Getting them returned, I need to scan them, georeference them and finally
digitize the features found.
Alone thinking of the process of georeferencing all those scans (which
might only have tiny offsets and shifts because of lousy scanners) make me
wish to have chosen another profession ...

So here is the idea:
An atlas plugin, that will automatically distribute minimum 6 cross-hairs
(or other automatically identifiable features) around your atlas canvas.
A QR-Code is generated, which holds the coordinates, EPSG and name of the
atlasfeature, and which is put in some restricted area of the composer map.
Maps are printed, processed and scanned afterwards.
Batch-import all scans.
Another function reads the QR-Code of the scan, identifies to locator
features, gives them the proper coordinates and automatically creates
georeferenced tiff/png/jpg with the name of the atlas feature.

Sounds like a dream, but I think there should be enough dreamers around to
make this one true.

Any ideas if this will work, and how to start this endeavour?

Cheers,
Bernd

--
Bernd Vogelgesang
Siedlerstraße 2
91083 Baiersdorf/Igelsdorf
Tel: 09133-825374
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Re: [QGIS-it-user] differenza tra vettori poligonali

[Gabriela Osaci Costache]

Ciao!Negli ultimi giorni ho lavorato con molti strati poligonali appunto per 
ottenere la differenza tra loro (per la dinamica dell'uso del suolo) e ho 
ottenuto degli oggetti con area nulla...infatti una linea (come nel video di 
Totò). A volte gli oggetti esistenti nella tabella non si potevano vedere sullo 
strato... una specie di "fantasma" :-(Ho voluto descrivere il problema in 
lista, ma non ho avuto il tempo.Ho usato QGIS 2.18.16 sotto W10 e la 
"differenza" di QGIS, in processing (come Totò).Saluti,Gabriela

  Da: Totò 
 A: qgis-it-user@lists.osgeo.org 
 Inviato: Sabato 3 Febbraio 2018 15:53
 Oggetto: Re: [QGIS-it-user] differenza tra vettori poligonali
  
nformica wrote
> Ma onestamente non sono sicuro, e forse è giusto che sia così !?
>  ci ragiono un pò sopra e appena posso mi vado a rileggere un pò di
> teoria sulle operazioni di overlay

Ciao Nino, grazie per la conferma.
Aggiungo che NON può e non deve essere cosi perchè sarebbe, IMHO, grave

aggiungo un video dimostrativo [0]:
nel video dimostro che si crea una feature di sovrapposizione che non ha
senso (perchè l'una è la differenza dell'altra) ed inoltre genera un nuovo
vertice dovuta alla sovrapposizione.


[0] https://youtu.be/uA1ZaGTW9TI




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Re: [Qgis-user] Idea: Crowd-sourcing a batch-georeferencer plugin with QR code ?

[Saber Razmjooei]

Maybe you can use a mobile/tablet device with (Q)GIS to collect data, so no
need to georeferencing and digitizing.

Regards
Saber



On 3 Feb 2018 16:22, "Bernd Vogelgesang"  wrote:

> Hi folks,
>
> I am facing a project, where I will produce hundreds of field maps with
> atlas from lots of small locations, which get printed for surveyors to fill
> in observations in the field.
> Getting them returned, I need to scan them, georeference them and finally
> digitize the features found.
> Alone thinking of the process of georeferencing all those scans (which
> might only have tiny offsets and shifts because of lousy scanners) make me
> wish to have chosen another profession ...
>
> So here is the idea:
> An atlas plugin, that will automatically distribute minimum 6 cross-hairs
> (or other automatically identifiable features) around your atlas canvas.
> A QR-Code is generated, which holds the coordinates, EPSG and name of the
> atlasfeature, and which is put in some restricted area of the composer map.
> Maps are printed, processed and scanned afterwards.
> Batch-import all scans.
> Another function reads the QR-Code of the scan, identifies to locator
> features, gives them the proper coordinates and automatically creates
> georeferenced tiff/png/jpg with the name of the atlas feature.
>
> Sounds like a dream, but I think there should be enough dreamers around to
> make this one true.
>
> Any ideas if this will work, and how to start this endeavour?
>
> Cheers,
> Bernd
>
>
> --
> Bernd Vogelgesang
> Siedlerstraße 2
> 91083 Baiersdorf/Igelsdorf
> Tel: 09133-825374
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Re: [QGIS-it-user] differenza tra vettori poligonali

[Stefano Campus]

Se ne era parlato qua.

http://gfoss-geographic-free-and-open-source-software-italian-mailing.3056002.n2.nabble.com/Risoluzione-spaziale-dataset-td7585941i20.html#a7586670

Il 03/Feb/2018 17:43, "nino formica"  ha scritto:

>  perché dovrebbe dipendere dagli arrotondamenti, puoi spiegarti meglio
> ?
>
> Nino
>
> Il 03 feb 2018 4:51 PM, "Stefano Campus"  ha scritto:
>
>> Immagino sia così per il solito problema degli arrotondimenti.
>> Prova su postgres
>>
>> Il 03/Feb/2018 14:53, "Totò"  ha scritto:
>>
>>> nformica wrote
>>> > Ma onestamente non sono sicuro, e forse è giusto che sia così !?
>>> >  ci ragiono un pò sopra e appena posso mi vado a rileggere un pò di
>>> > teoria sulle operazioni di overlay
>>>
>>> Ciao Nino, grazie per la conferma.
>>> Aggiungo che NON può e non deve essere cosi perchè sarebbe, IMHO,
>>> grave
>>>
>>> aggiungo un video dimostrativo [0]:
>>> nel video dimostro che si crea una feature di sovrapposizione che non ha
>>> senso (perchè l'una è la differenza dell'altra) ed inoltre genera un
>>> nuovo
>>> vertice dovuta alla sovrapposizione.
>>>
>>>
>>> [0] https://youtu.be/uA1ZaGTW9TI
>>>
>>>
>>>
>>>
>>> -
>>> https://pigrecoinfinito.wordpress.com/
>>> --
>>> Sent from: http://osgeo-org.1560.x6.nabble.com/QGIS-Italian-User-f52506
>>> 12.html
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>>
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Re: [QGIS-it-user] differenza tra vettori poligonali

[nino formica]

 perché dovrebbe dipendere dagli arrotondamenti, puoi spiegarti meglio ?

Nino

Il 03 feb 2018 4:51 PM, "Stefano Campus"  ha scritto:

> Immagino sia così per il solito problema degli arrotondimenti.
> Prova su postgres
>
> Il 03/Feb/2018 14:53, "Totò"  ha scritto:
>
>> nformica wrote
>> > Ma onestamente non sono sicuro, e forse è giusto che sia così !?
>> >  ci ragiono un pò sopra e appena posso mi vado a rileggere un pò di
>> > teoria sulle operazioni di overlay
>>
>> Ciao Nino, grazie per la conferma.
>> Aggiungo che NON può e non deve essere cosi perchè sarebbe, IMHO,
>> grave
>>
>> aggiungo un video dimostrativo [0]:
>> nel video dimostro che si crea una feature di sovrapposizione che non ha
>> senso (perchè l'una è la differenza dell'altra) ed inoltre genera un nuovo
>> vertice dovuta alla sovrapposizione.
>>
>>
>> [0] https://youtu.be/uA1ZaGTW9TI
>>
>>
>>
>>
>> -
>> https://pigrecoinfinito.wordpress.com/
>> --
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>> 12.html
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Re: [Qgis-user] qgis/postgis : flow map

[Casper Bertelsen]

Try use DB Manager (QGIS Plugin - Comes with standard installation of 
QGIS), here you can connect to the database and run queries and 
afterwards import the queries into QGIS.


When you've create a link to your database in "Add PostGIS-layers" (Ctrl 
+ Shift + D) it should show up in DB manager :) Here it'll be able to 
read the postgis-functions in the database.


Hope it helps.

Mvh. / Best regards
Casper Bertelsen

Mail: casperb...@gmail.com

On 03-02-2018 14:06, image wrote:

Good morning,

I have to do flow map (home->working place) for my area of interest (28
french cities).
I get a database .dbf created by a french institute. I imported it into
postgres/postgis.
One row = 1 people.
My table is composed by several fields :
id (primary key)
codgeo_res: residence (home) city 's id
x_resi: residence (home) city 's longitude(centroid)
y_resi : residence (home) city 's latitude(centroid)
codgeo_tr : work place city 's id
x_tr: work city 's longitude(centroid)
y_tr :work city 's latitude(centroid)
ipondi : poids de l'individu (weighting value assigned to each individual du
to the sampling)
geom : residence (home) city 's ponctual geometry (centroid)


So my goal is to create a new table in order 1 row = 1 flow (city A toward
city B)
I have to generate useful  geometries (points + lines arrow). Moreover, have
to apply a SUM on the ipondi field and a GROUP BY on "codgeo_res" field.

Could you throw light for me? Could you help me in order to translate this
objective to functional sql queries?

Up to now, i tried to run this query throw qgis interface called "virtual
layer creation" :
--
Code:

select
st_makeline(st_makepoint(entrants_only.x_resi,entrants_only.y_resi),st_makepoint(entrants_only.x_tr,entrants_only.y_tr))as
geometry,sum(entrants_only.ipondi) as sumipondi, entrants_only.codgeo_res as
codgeo_res, entrants.codgeo_tr as codgeo_tr

from entrants_only
group by entrants_only.codgeo_res


But i get this error message :
-
query preparation error on PRAGMA table_info(_tview): no such column
entrants_only.geom
-

Moreover, i send you by attachment the Screen shot representing the error
message.


In advance, thank you for your help.





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[Qgis-user] Idea: Crowd-sourcing a batch-georeferencer plugin with QR code ?

[Bernd Vogelgesang]

Hi folks,

I am facing a project, where I will produce hundreds of field maps with  
atlas from lots of small locations, which get printed for surveyors to  
fill in observations in the field.
Getting them returned, I need to scan them, georeference them and finally  
digitize the features found.
Alone thinking of the process of georeferencing all those scans (which  
might only have tiny offsets and shifts because of lousy scanners) make me  
wish to have chosen another profession ...


So here is the idea:
An atlas plugin, that will automatically distribute minimum 6 cross-hairs  
(or other automatically identifiable features) around your atlas canvas.
A QR-Code is generated, which holds the coordinates, EPSG and name of the  
atlasfeature, and which is put in some restricted area of the composer map.

Maps are printed, processed and scanned afterwards.
Batch-import all scans.
Another function reads the QR-Code of the scan, identifies to locator  
features, gives them the proper coordinates and automatically creates  
georeferenced tiff/png/jpg with the name of the atlas feature.


Sounds like a dream, but I think there should be enough dreamers around to  
make this one true.


Any ideas if this will work, and how to start this endeavour?

Cheers,
Bernd


--
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Siedlerstraße 2
91083 Baiersdorf/Igelsdorf
Tel: 09133-825374
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[Qgis-user] qgis/postgis : flow map

[image]

Good morning,

I have to do flow map (home->working place) for my area of interest (28
french cities). 
I get a database .dbf created by a french institute. I imported it into
postgres/postgis.
One row = 1 people. 
My table is composed by several fields : 
id (primary key)
codgeo_res: residence (home) city 's id
x_resi: residence (home) city 's longitude(centroid)
y_resi : residence (home) city 's latitude(centroid)
codgeo_tr : work place city 's id
x_tr: work city 's longitude(centroid)
y_tr :work city 's latitude(centroid)
ipondi : poids de l'individu (weighting value assigned to each individual du
to the sampling)
geom : residence (home) city 's ponctual geometry (centroid)


So my goal is to create a new table in order 1 row = 1 flow (city A toward
city B)
I have to generate useful  geometries (points + lines arrow). Moreover, have
to apply a SUM on the ipondi field and a GROUP BY on "codgeo_res" field.

Could you throw light for me? Could you help me in order to translate this
objective to functional sql queries? 

Up to now, i tried to run this query throw qgis interface called "virtual
layer creation" :
--
Code:

select
st_makeline(st_makepoint(entrants_only.x_resi,entrants_only.y_resi),st_makepoint(entrants_only.x_tr,entrants_only.y_tr))as
geometry,sum(entrants_only.ipondi) as sumipondi, entrants_only.codgeo_res as
codgeo_res, entrants.codgeo_tr as codgeo_tr

from entrants_only
group by entrants_only.codgeo_res


But i get this error message :
-
query preparation error on PRAGMA table_info(_tview): no such column
entrants_only.geom
-

Moreover, i send you by attachment the Screen shot representing the error
message. 
 

In advance, thank you for your help. 





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[QGIS-it-user] differenza tra vettori poligonali

[Totò]

Ciao a tutti,

oggi, per caso, ho riscontrato un comportamento strato del geoprocessing
'differenza', sia di qgis che di saga, stesso comportamento che spiego di
seguito.

vi invito a fare questa prova:

1. disegnare un poligono, es. un bel quadrato (primo shapefile poligonale);
2. disegnare un secondo poligono, es. un rettangolo, stretto e alto, che si
sovrapponga al primo ( secondo shapefile);
3. fate la differenza tra i due poligoni (quadrato - rettangolo);
4. ora, uniteli nuovamente: union di qgis, unite la differenza con il
secondo shape;
5. teoricamente dobbiamo unire due poligoni ma l'union da vita a tre
poligoni (il terzo ha superficie nulla)

da varie prove ho dedotto che il problema sta nella differenza e non
nell'unione, perchè?

perchè se invece di unire il vettore differenza con il secondo shapefile,
unisco il vettore differenza con un altro shape (ottenuto ridigitalizzando
il secondo shapefile che ho usato per fare la differenza) l'union da due
soli poligoni, cioè corretto.

la notizia cattiva è che ho provato con 2.14,2.18 e master hanno tutti
il problema; ripeto anche con difference di saga.

quqalcuno puo' provare?

saluti





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[QGIS-it-user] Problema con r.viewshed - RISOLTO

[Carlo Nardi]

Ciao a tutti

  

Come vedete dall'oggetto riapro una mia vecchia discussione, dove grazie a voi 
ho risolto il problema, ma penso di aver trovato altri problemini.

Il problema iniziale era che r.viewshed non mi funzionava e il risultato finale 
era un errore che avevo inserito nelle e-mail procedenti.

Grazie ai vostri suggerimenti ho fatto delle prove e sembrava che andasse tutto 
bene.

Oggi ho fatto altri tentativi e qualche volta andava e qualche volta no, quindi 
ho proceduto a piccole modifiche.

  

Quello che ho capito è che r.viewshed:

- non accetta le lettere accentate (ho messo le lettere accentate nella 
cartella dove ho i file, penso che non le accetta neanche all'interno del nome 
del file)

- non accetta le lettere maiuscole (ho messo le lettere accentate nella 
cartella dove ho i file, penso che non le accetta neanche all'interno del nome 
del file)

- non accetta la riproiezione al volo



Ho scritto per capire se anche alte persone riscontrano questi problemi o ci 
sono da aggiungerne altri.

Grazie

Carlo
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Re: [QGIS-it-user] Errore nell'aggiornamento di Go2StreetView

[Enrico Ferreguti]

No. Streetview coverage contiene solo la copertura attuale. Per conoscere
la data delle immagini bisogna attivare tra le options "View streetview
image date"
Ciao. Enrico

Il giorno 3 febbraio 2018 10:22, antonio valanzano  ha
scritto:

> Qualcuno che usa questo plugin può dirmi se associate alla Streetview
> coverage  ci sono informazioni sulla data delle riprese ?
> Grazie in anticipo
>
>
>
> 
>  Virus-free.
> www.avg.com
> 
> <#m_-3878302050442591624_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
>
> Il giorno 31 gennaio 2018 23:02, Enrico Ferreguti 
> ha scritto:
>
>> Siete tutti molto gentili, soprattutto ad aiutarmi a scovare questi bachi
>> noiosi...
>> Provvederò al più presto. Mi devo guadagnare le birrette!
>>
>>
>> Il giorno 31 gennaio 2018 21:18, andreaerdna  ha
>> scritto:
>>
>>> Totò wrote
>>> > skampus wrote
>>> >> c'è già.
>>> >
>>> > strato che uso come tile xyz, usando questo link [0]
>>> > [0]
>>> > https://mts2.google.com/mapslt?lyrs=svv={x}={y}={z}=
>>> 256=256=en=40,18
>>>
>>> Nel mio QGIS 2.18.16 il layer "Streetview coverage" aggiunto dal plugin
>>> go2streetview 7.4.1 non viene visualizzato in mappa e, tentando di
>>> visualizzarne le proprietà, viene riportato l'errore:
>>> AttributeError: 'QgsPluginLayer' object has no attribute 'transparency'
>>> Traceback (most recent call last):
>>>   File
>>> "C:/Users/Andrea/.qgis2/python/plugins\go2streetview\py_tile
>>> d_layer\tilelayer.py",
>>> line 695, in showLayerProperties
>>> dialog = PropertiesDialog(layer)
>>>   File
>>> "C:/Users/Andrea/.qgis2/python/plugins\go2streetview\py_tile
>>> d_layer\propertiesdialog.py",
>>> line 49, in __init__
>>> self.ui.spinBox_Transparency.setValue(layer.transparency)
>>> AttributeError: 'QgsPluginLayer' object has no attribute 'transparency'
>>>
>>> Viene invece visualizzata perfettamente la copertura Streetview se
>>> aggiunta
>>> manualmente come layer Tile server con URL
>>> https://mts2.google.com/mapslt?lyrs=svv={x}={y}={z}=
>>> 256=256=en=40,18
>>>
>>>
>>>
>>> -
>>> Andrea Giudiceandrea
>>> --
>>> Sent from: http://osgeo-org.1560.x6.nabble.com/QGIS-Italian-User-f52506
>>> 12.html
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>>
>>
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Re: [QGIS-it-user] Errore nell'aggiornamento di Go2StreetView

[antonio valanzano]

Qualcuno che usa questo plugin può dirmi se associate alla Streetview
coverage  ci sono informazioni sulla data delle riprese ?
Grazie in anticipo



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<#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>

Il giorno 31 gennaio 2018 23:02, Enrico Ferreguti  ha
scritto:

> Siete tutti molto gentili, soprattutto ad aiutarmi a scovare questi bachi
> noiosi...
> Provvederò al più presto. Mi devo guadagnare le birrette!
>
>
> Il giorno 31 gennaio 2018 21:18, andreaerdna  ha
> scritto:
>
>> Totò wrote
>> > skampus wrote
>> >> c'è già.
>> >
>> > strato che uso come tile xyz, usando questo link [0]
>> > [0]
>> > https://mts2.google.com/mapslt?lyrs=svv={x}={y}={z}=
>> 256=256=en=40,18
>>
>> Nel mio QGIS 2.18.16 il layer "Streetview coverage" aggiunto dal plugin
>> go2streetview 7.4.1 non viene visualizzato in mappa e, tentando di
>> visualizzarne le proprietà, viene riportato l'errore:
>> AttributeError: 'QgsPluginLayer' object has no attribute 'transparency'
>> Traceback (most recent call last):
>>   File
>> "C:/Users/Andrea/.qgis2/python/plugins\go2streetview\py_
>> tiled_layer\tilelayer.py",
>> line 695, in showLayerProperties
>> dialog = PropertiesDialog(layer)
>>   File
>> "C:/Users/Andrea/.qgis2/python/plugins\go2streetview\py_
>> tiled_layer\propertiesdialog.py",
>> line 49, in __init__
>> self.ui.spinBox_Transparency.setValue(layer.transparency)
>> AttributeError: 'QgsPluginLayer' object has no attribute 'transparency'
>>
>> Viene invece visualizzata perfettamente la copertura Streetview se
>> aggiunta
>> manualmente come layer Tile server con URL
>> https://mts2.google.com/mapslt?lyrs=svv={x}={y}={z}=
>> 256=256=en=40,18
>>
>>
>>
>> -
>> Andrea Giudiceandrea
>> --
>> Sent from: http://osgeo-org.1560.x6.nabble.com/QGIS-Italian-User-f52506
>> 12.html
>> ___
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>> QGIS-it-user@lists.osgeo.org
>> https://lists.osgeo.org/mailman/listinfo/qgis-it-user
>>
>
>
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Re: [Qgis-user] Profiles

[Paolo Cavallini]

Hi Saber,
thanks for your note.

Il 03/02/2018 07:48, Saber Razmjooei ha scritto:

> Each of those profile tools uses a different library for plotting.
> 
> I think for migration to QGIS 3, it is best to use Qt Charts module
> which has been GPLed since Qt 5.7:
> 
> http://doc.qt.io/QtCharts/

right, migration to Q3 is the right time to deal with these issue, and
demultiplying similar plugins. that's why I'm calling for help.

> IMO, profile tool should be a core QGIS function.

fully agreed. is there a feature request ticket?
all the best.
-- 
Paolo Cavallini - www.faunalia.eu
QGIS & PostGIS courses: http://www.faunalia.eu/training.html
https://www.google.com/trends/explore?date=all=IT=qgis,arcgis
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