Re: [Qgis-user] transferring data from ArcGis to QGIS

[Brent Wood via QGIS-User]

Hi Janet,

See https://north-road.com/slyr/

There is a free community version and a commercial one if you need the extra 
functionality.




Brent Wood

Principal Technician, Fisheries
NIWA
DDI:  +64 (4) 3860529


From: QGIS-User  on behalf of Janet via 
QGIS-User 
Sent: Friday, January 20, 2023 10:20
To: qgis-user@lists.osgeo.org 
Subject: [Qgis-user] transferring data from ArcGis to QGIS

For a number of years, whilst a student and on the staff of University I have 
used ArcGis.  After this year I will be retiring from University and losing 
this access.  I would like to copy all my work over to QGIS, so that I can 
continue my research, could you let me know if this is possible and where I can 
locate directions to do it.  I have all my work on an external hard drive.

Many thanks

Janet
[https://www.niwa.co.nz/static/niwa-2018-horizontal-180.png] 

Brent Wood
Principal Technician - GIS and Spatial Data Management
Programme Leader - Environmental Information Delivery
+64-4-386-0529

National Institute of Water & Atmospheric Research Ltd (NIWA)
301 Evans Bay Parade Hataitai Wellington New Zealand
Connect with NIWA: niwa.co.nz 
Facebook 
LinkedIn 
Twitter 
Instagram
To ensure compliance with legal requirements and to maintain cyber security 
standards, NIWA's IT systems are subject to ongoing monitoring, activity 
logging and auditing. This monitoring and auditing service may be provided by 
third parties. Such third parties can access information transmitted to, 
processed by and stored on NIWA's IT systems
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Re: [Qgis-user] transferring data from ArcGis to QGIS

[Stefan Giese (WhereGroup) via QGIS-User]

Hi Janet,

beside what Alexandre pointed out, there is an other free Open source 
tool to convert ArcMap mxd files into QGIS projects (MapQonverter, 
https://github.com/WhereGroup/mapqonverter). The difference to SLYR is, 
that MapQonverter must be used within ArcMap as an ArcMap Python 
toolbox. So it is only useful if you still have an ArcMap licence to 
work with.


Best regards

Stefan

Am 20.01.2023 um 02:50 schrieb Alexandre Neto via QGIS-User:

Hello Janet,

It will really depend on what you mean by all your work. The projects 
and layouts are hard to come by, as they are in closed source format, 
which ain't interoperable with other software. But the data may be in 
one of hundreads of formats readable by QGIS, like Shapefiles and 
Filegeodatabases.


There's a plugin that tries to import QrcGIS styles into QGIS, but not 
sure what it can do. It's called SLYR, there a paid version and a 
community version/




Janet via QGIS-User  escreveu no dia 
quinta, 19/01/2023 à(s) 21:20:


For a number of years, whilst a student and on the staff of
University I have used ArcGis.  After this year I will be retiring
from University and losing this access.  I would like to copy all
my work over to QGIS, so that I can continue my research, could
you let me know if this is possible and where I can locate
directions to do it.  I have all my work on an external hard drive.

Many thanks

Janet
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--
Mit freundlichen Grüßen
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-
Aufwind durch Wissen!
Jetzt neu: Web-Seminare und Online-Schulungen
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Germany

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

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Re: [Qgis-user] QGIS & GPS

[Stefan Giese (WhereGroup) via QGIS-User]

Hi Brent,


we solved this for one of our customers with the following steps:

 * Installing U-Center on the windows computer:
   https://www.u-blox.com/en/product/u-center
 * in U-Center -> View -> Configuration view → NMEA (NMEA Protocol)
 * change "Main Talker ID" to "1 – GP(GPS)"
 * click on "SEND" and then on "POLL"
 * now QGIS should directly communicate

hope this helps

Stefan

Mit freundlichen Grüßen
Stefan Giese
Projektleiter/Consultant
-
Aufwind durch Wissen!
Jetzt neu: Web-Seminare und Online-Schulungen
bei derwww.foss-academy.com
-
WhereGroup GmbH
Schwimmbadstr. 2
79100 Freiburg
Germany

Tel.: +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 20.01.2023 um 03:50 schrieb Brent Wood via QGIS-User:

Gidday and Happy New Year from New Zealand!

I have spent too many hours on this already, sigh... Hopefully someone 
can help.


I normally use QGIS with USB GPS units on Linux and don't have driver 
issues, everything just works. But I now need to re-introduce myself 
to QGIS on Windows to set things up for other users, and it is proving 
very painful.


I'm using QGIS dev (3.29), 3.22 & v3.28 at present. Same issue on 
Windows with all of them.


I have historically used a Globalsat BR-355S4 USB GPS on Windows with 
no problems. Just install the Prolific USB-serial driver and 
everything works fine.


My recent Linux work has been using a G-Mouse (U-blox 7) chipset GPS 
which Linux typically mounts as /dev/ttyACM0 and QGIS is fine with 
that. Linux needs no additional drivers to be installed for this to work.


Now I'm trying to get this working on Windows... I can install the 
U-blox VCP (virtual com port) driver. The native driver Win10 finds & 
installs also  seems to work, but not with QGIS. I can connect to the 
relevant com port with several GPS monitoring applications & see the 
NMEA sentences fine. QGIS lists the port OK, but fails to connect on 
auto or to the port directly. This is not uncommon with the U-Blox 7, 
but none of the fixes I have found online have worked for me.


I just bought anotherGPS, a new model Globalsat one, BU-353N5, a 
replacement for the BR-355S4. This is not sending the $GP sentences, 
just the $GN ones. My GPS monitoring applications work OK with this on 
Linux & Windows, but QGIS on both platforms lists the device to 
connect to, but is unable to connect & use the GPS data. I can't even 
log the data with QGIS as QGIS won't connect to the port in the first 
place.


My 3 questions:

How can I get a U-Blox7 chipset GPS (which is working fine on Windows 
with other applications) recognised by and working with QGIS?


How can I get a Globalsat  BU-353N or other GPS that does not output 
$GPGGA or $GPRWC, but provides $GNGGA instead, etc working with QGIS?


Can anyone suggest an alternative cheap, generic USB GPS which simply 
and reliably works with QGIS on Windows?


Is this something that I should file a bug report for (it does seem to 
be a fragility in QGIS that is not present in other GPS software)? I'm 
happy to send a working USB GPS to any dev willing to look into this.



Thanks

Brent Wood

Principal Technician, Fisheries
NIWA
DDI:  +64 (4) 3860529
  Brent Wood
Principal Technician - GIS and Spatial Data Management
Programme Leader - Environmental Information Delivery
+64-4-386-0529

National Institute of Water & Atmospheric Research Ltd (NIWA)
301 Evans Bay Parade Hataitai Wellington New Zealand
*Connect with NIWA:* niwa.co.nz  Facebook 
 LinkedIn 
 Twitter 
 Instagram 



To ensure compliance with legal requirements and to maintain cyber 
security standards, NIWA's IT systems are subject to ongoing 
monitoring, activity logging and auditing. This monitoring and 
auditing service may be provided by third parties. Such third parties 
can access information transmitted to, processed by and stored on 
NIWA's IT systems


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[Qgis-user] QGIS & GPS

[Brent Wood via QGIS-User]

Gidday and Happy New Year from New Zealand!

I have spent too many hours on this already, sigh... Hopefully someone can help.

I normally use QGIS with USB GPS units on Linux and don't have driver issues, 
everything just works. But I now need to re-introduce myself to QGIS on Windows 
to set things up for other users, and it is proving very painful.

I'm using QGIS dev (3.29), 3.22 & v3.28 at present. Same issue on Windows with 
all of them.

I have historically used a Globalsat BR-355S4 USB GPS on Windows with no 
problems. Just install the Prolific USB-serial driver and everything works fine.

My recent Linux work has been using a G-Mouse (U-blox 7) chipset GPS which 
Linux typically mounts as /dev/ttyACM0 and QGIS is fine with that. Linux needs 
no additional drivers to be installed for this to work.

Now I'm trying to get this working on Windows... I can install the U-blox VCP 
(virtual com port) driver. The native driver Win10 finds & installs also  seems 
to work, but not with QGIS. I can connect to the relevant com port with several 
GPS monitoring applications & see the NMEA sentences fine. QGIS lists the port 
OK, but fails to connect on auto or to the port directly. This is not uncommon 
with the U-Blox 7, but none of the fixes I have found online have worked for me.

I just bought another GPS, a new model Globalsat one, BU-353N5, a replacement 
for the BR-355S4. This is not sending the $GP sentences, just the $GN ones. My 
GPS monitoring applications work OK with this on Linux & Windows, but QGIS on 
both platforms lists the device to connect to, but is unable to connect & use 
the GPS data. I can't even log the data with QGIS as QGIS won't connect to the 
port in the first place.

My 3 questions:

How can I get a U-Blox7 chipset GPS (which is working fine on Windows with 
other applications) recognised by and working with QGIS?

How can I get a  Globalsat  BU-353N or other GPS that does not output $GPGGA or 
$GPRWC, but provides $GNGGA instead, etc working with QGIS?

Can anyone suggest an alternative cheap, generic USB GPS which simply and 
reliably works with QGIS on Windows?

Is this something that I should file a bug report for (it does seem to be a 
fragility in QGIS that is not present in other GPS software)? I'm happy to send 
a working USB GPS to any dev willing to look into this.


Thanks

Brent Wood

Principal Technician, Fisheries
NIWA
DDI:  +64 (4) 3860529
[https://www.niwa.co.nz/static/niwa-2018-horizontal-180.png] 

Brent Wood
Principal Technician - GIS and Spatial Data Management
Programme Leader - Environmental Information Delivery
+64-4-386-0529

National Institute of Water & Atmospheric Research Ltd (NIWA)
301 Evans Bay Parade Hataitai Wellington New Zealand
Connect with NIWA: niwa.co.nz 
Facebook 
LinkedIn 
Twitter 
Instagram
To ensure compliance with legal requirements and to maintain cyber security 
standards, NIWA's IT systems are subject to ongoing monitoring, activity 
logging and auditing. This monitoring and auditing service may be provided by 
third parties. Such third parties can access information transmitted to, 
processed by and stored on NIWA's IT systems
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Re: [Qgis-user] transferring data from ArcGis to QGIS

[Alexandre Neto via QGIS-User]

Hello Janet,

It will really depend on what you mean by all your work. The projects and
layouts are hard to come by, as they are in closed source format, which
ain't interoperable with other software. But the data may be in one of
hundreads of formats readable by QGIS, like Shapefiles and Filegeodatabases.

There's a plugin that tries to import QrcGIS styles into QGIS, but not sure
what it can do. It's called SLYR, there a paid version and a community
version/



Janet via QGIS-User  escreveu no dia quinta,
19/01/2023 à(s) 21:20:

> For a number of years, whilst a student and on the staff of University I
> have used ArcGis.  After this year I will be retiring from University and
> losing this access.  I would like to copy all my work over to QGIS, so that
> I can continue my research, could you let me know if this is possible and
> where I can locate directions to do it.  I have all my work on an external
> hard drive.
>
> Many thanks
>
> Janet
> ___
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> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
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Re: [Qgis-user] Two 'Random Points in Polygons' tools?

[Andrea Giudiceandrea via QGIS-User]

Il 19/01/2023 22:31, Andrea Giudiceandrea ha scritto:
Anyway, AFAIK the "Random points in polygons" is an old Python 
algorithm, while the "Random points in polygons" is a new C++ one. The 
description given by the author of the latter, may give you more 
details [3].


A typo... The "Random points inside polygons" is the old Python algorithm.

Best regards.

Andrea Giudiceandrea

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Re: [Qgis-user] Two 'Random Points in Polygons' tools?

[Andrea Giudiceandrea via QGIS-User]

*Alexei Schwab*alexei at fastmail.net 


/Thu Jan 19 12:26:11 PST 2023/

* Random Points in Polygons
* Random Points inside Polygons

To me they look very similar but I was wondering if anyone on the list could 
clarify if they do anything different?


Aren't the description of the two processing algorithms in the user 
manual [1] [2] and in the of any help for you?


Anyway, AFAIK the "Random points in polygons" is an old Python 
algorithm, while the "Random points in polygons" is a new C++ one. The 
description given by the author of the latter, may give you more details 
[3].


Best regards.

Andrea Giudiceandrea

[1] 
https://docs.qgis.org/3.22/en/docs/user_manual/processing_algs/qgis/vectorcreation.html#random-points-in-polygons
[2] 
https://docs.qgis.org/3.22/en/docs/user_manual/processing_algs/qgis/vectorcreation.html#random-points-inside-polygons

[3] https://github.com/qgis/QGIS/pull/35745___
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[Qgis-user] transferring data from ArcGis to QGIS

[Janet via QGIS-User]

For a number of years, whilst a student and on the staff of University I have 
used ArcGis.  After this year I will be retiring from University and losing 
this access.  I would like to copy all my work over to QGIS, so that I can 
continue my research, could you let me know if this is possible and where I can 
locate directions to do it.  I have all my work on an external hard drive.
Many thanks
Janet
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[Qgis-user] Two 'Random Points in Polygons' tools?

[Alexei Schwab via QGIS-User]

Hi QGIS list,

In my install of QGIS 3.28.1 I have two tools in Vector > Research Tools menu: 
* Random Points in Polygons
* Random Points inside Polygons 

See screenshot here: https://imgur.com/a/FyuPc2p

To me they look very similar but I was wondering if anyone on the list could 
clarify if they do anything different?

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[Qgis-user] Crowd-Funding Call 2023

[Anita Graser via QGIS-User]

Hi everyone, 

Some of you may have already seen our crowd-funding call on the official QGIS 
blog. I would like to take the initiative to share it through this channel as 
well: 


QGIS turned 20 last year. We want to ensure another 20+ years of sustainable 
development to keep on bringing the most user-friendly GIS to users worldwide. 

This year, we, therefore, plan to focus on addressing long-standing 
infrastructure debt (particularly docs and web infrastructure). To make this 
infrastructure more sustainable, we had to make the difficult decision to move 
funds from our annual grant programme to rather support these infrastructure 
tasks. To address upcoming challenges (including but not limited to Qt6 support 
and next-generation installers) and to the grant programme back to full 
strength, we need additional funds. The best way to achieve this goal is to 
enlarge our sustaining member base. 

Our existing sustaining members contribute €130k per year. We are aiming to 
raise an additional €70k per year (equivalent to 1 new flagship, 3 new large, 4 
new medium, and 8 new small sustaining memberships) to bring the total member 
contributions up to €200k.

The campaign to raise funds for our activities runs from 16th January 2023 
until 16th February 2023.

You can find more information and follow our funding progress on:

https://blog.qgis.org/2023/01/16/crowd-funding-call-2023/

Regards,
Anita


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Re: [Qgis-user] Qgis Server: Configuring max number of WFS features served by the server

[Tom via QGIS-User]

Hello Gerald,
thank you! 
I set the variable and I see in the log file the following message


"15:41:27 INFO Server[93]: - QGIS_SERVER_API_WFS3_MAX_LIMIT / 
'/qgis/server_api_wfs3_max_limit' (Maximum value for "limit" in a features 
request, defaults to 1): '1000' (read from ENVIRONMENT_VARIABLE) "


So, it should work, but the WFS requests are still returning all 
features...How can I debug this?


Best regards, Tommaso


On Tuesday 17 January 2023 15:30:55 (+01:00), Gerald Kogler via QGIS-User 
wrote:



> Hi Tom,

> 

> I think QGIS_SERVER_API_WFS3_MAX_LIMIT is what you are looking for: 
https://docs.qgis.org/3.22/en/docs/server_manual/config.html#environment-variables







> For sure you always can limit it also from the request using 
MAXFEATURES, which is a standard OGC WFS parameter: 
https://docs.qgis.org/3.22/en/docs/server_manual/services/wfs.html#wfs-getfeature-maxfeatures







> hope that helps

> Gerald

> 

> 

> 


> On 17/1/23 15:22, Tom via QGIS-User wrote:

> > Hello,

> > I want to limit the number of WFS features serve by Qgis Server.

> > In Geoserver one can configure this in "Maximum number of features"

> > There is such a option in Qgis Server?

> > Best regards, Tommaso

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Re: [QGIS-it-user] Quesito

[Marco Guiducci]

ciao, prima di tutto è buona norma rispondere sempre in lista, in modo 
che i problemi e le eventuali soluzioni diventino patrimonio di tutti.

Nello specifico la risposta è nel testo mio:
1) l'accuratezza dei dati iniziali è spinta?
2) se si allora occorre una conversione di coordinate corretta. quella 
oggi migliore e ufficiale esistente avviene tramite i grigliati IGM. se 
non si possiedono né questi né un software che li usa, vale il 
suggerimento di usare la conversione online
3) comunque sia tale conversione è ampiamente persa quando si 
sovrappongono i dati su servizi web di cui, ripeto, non si conosce la 
storia.
4) 3-4 metri è il frutto del punto 3. Quindi è probabile che sia il 
massimo che puoi ottenere.


Anche avendo a disposizione cartografia certificata, ad esempio ii 
servizi wms di Regione Toscana, occorre tener conto dell'accuratezza 
planimetrica del dato.
L'accuratezza per esempio della carta tecnica regionale a scala 1:10.000 
è 2,5 metri, cioè l'ordine di grandezza delle differenze che tu noti.


Le conversioni con i grigliati servono per rilievi topografici. in 
ambito gis siamo ad un ordine di grandezza cinque/dieci volte minore.


Ad esempio non ha nessun senso fare un rilievo topografico con 
accuratezza centimetrica (gps differenziale in modalità statica) e poi 
volerlo sovrapporre ad un dato con accuratezza imprecisata o comunque 
inferiore.


In conclusione e ripetendo: il tuo dato che accuratezza ha?
Se è di ordine topografico/geodetico (centimetrica) il posizionamento su 
una carta che ha accuratezza dieci volte meno sarà quel che sarà.
Se è ottenuto tramite gps diciamo "escursionistico" o telefono, 
l'accuratezza dei due sistemi si equivalgono e i 3/4 è il massimo che 
puoi raggiungere (quando va bene).


I punti rilevati con apparecchi sopra citati vanno vanno integrati con 
"schizzi" monografici sul posto se è necessario poi riposizionarli 
correttamente su una cartografia.
Quando i faccio i corsi faccio questo esempio: rilievo della posizione 
di uno sversamento in un corso d'acqua. in questo caso l'accuratezza di 
4 metri metri potrebbe essere importante. Il dato nativo sovrapposto 
alla cartografia potrebbe risultare o monte o a valle di qualcosa, il 
che può fare differenza.
Quindi in questo tipo di rilievo non basta affidarsi allo strumento ma 
occorre integrare con appunti sul terreno.


mi sono dilungato
mg

Il 19/01/2023 15:06, Luca Soccal ha scritto:
Buonasera, la ringrazio del consiglio, ho utilizzato l' epsg 3003 ma 
sono fuori di circa 3-4 metri. Come posso fare per ridurre la differenza?


Grazie


Il giovedì 19 gennaio 2023 12:01:25 CET, Marco Guiducci 
 ha scritto:



Il 19/01/2023 10:45, Andrea Giudiceandrea via QGIS-it-user ha scritto:
> Ciao Luca,
> ti inoltro la risposta di Enrico Sferlazza per te che ha erroneamente
> inviato a me invece che alla mailing list.
>
> Se non conosci la procedura suggerita da Enrico, io ti consiglio di
> usare il servizio Web messo a disposizione dall'IGM [1] per effettuare
> la riproiezione del layer e di leggere il manuale utene di QGIS [2]
> [3] [4] e l'introduzione al GIS di QGIS [5] in quanto, dagli
> screenshot che hai fornito, sembra che non ti sia ben chiara la
> procedura da seguire per riproiettare un layer da un CRS ad un altro.
> Inoltre ti consiglio anche di leggere il documento redatto dall'IGM in
> merito ai sistemi di riferimento delle coordinate usati in Italia [6].
>
> A presto.
>
> Andrea
>
> [1] https://www.igmi.org/vol/index_file.php
> [2]
> 
https://docs.qgis.org/3.22/it/docs/user_manual/working_with_vector/vector_properties.html#coordinate-reference-system-and-geometry

> [3]
> 
https://docs.qgis.org/3.22/it/docs/user_manual/processing_algs/qgis/vectorgeneral.html#reproject-layer

> [4]
> 
https://docs.qgis.org/3.22/it/docs/user_manual/working_with_projections/working_with_projections.html

> [5]
> 
https://docs.qgis.org/3.22/it/docs/gentle_gis_introduction/coordinate_reference_systems.html

> [6] https://www.igmi.org/++theme++igm/pdf/nuova_nota_EPSG.pdf
>
>
>  Messaggio Inoltrato 
> Oggetto:     Re: [QGIS-it-user] Quesito
> Data:     Wed, 18 Jan 2023 18:39:51 +0100
> Mittente:     Ernesto Sferlazza 
>
>
>
> Dovresti applicare allo shapefile una trasformazione personalizzata
> basata su griglie di scostamenti, i cosiddetti "grigliati" che
> consentono la trasformazione di precisione tra i diversi datum
> utilizzati (Roma40 e WGS84). QGis consente di applicare la
> trasformazione anche "al volo" (on the fly). In rete puoi trovare con
> una breve ricerca una versione gratuita dei grigliati nel formato NtV2
> validi su tutto il territorio italiano
> s://lists.osgeo.org/mailman/listinfo/qgis-it-user

a mio parere per sovrapporre su bing non importa scomodare Ntv2 o le
trasformazioni fornite da IGM. bastano i parametri "blandi" interni a 
QGis.

intendo: anche se il dato sorgente fosse definito "al millimetro",
questa "precisione" si perde nella sovrapposizione su un dato fornito
dal 

[QGIS-it-user] grigliati

[Luca Soccal via QGIS-it-user]

Buonasera, qual'è il file a cui devo aggiungere una riga?
Grazie

L.S.


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Re: [Qgis-user] problem with cartographic label placement

[Uwe via QGIS-User]

Hello Andreas and list,

 

I am sure I’m not the first one to encounter the problem described below. So I 
would like to ask again. Maybe someone has an idea?

 

thanks a lot, the solution from Andreas is working.

But the result is not as desired. I was hoping to be able to define a ranking 
of placement alternatives. That is (in case of ‘B,R‘): place all the labels at 
the bottom and only if there is a conflict (overlap) with something else place 
a label at right.

But what I get is: most oft he labels are placed right, even without overlap 
problems (although I put ‘R‘ at the second place of the list). And only a few 
labels are placed at bottom. 

 

However, the overlap problem is solved.

 

Is there something I could improve?

 

Thank you and best regards, Uwe

 

Von: Andreas Neumann  
Gesendet: Donnerstag, 12. Januar 2023 22:18
An: gisfi...@t-online.de
Cc: qgis-user 
Betreff: Re: [Qgis-user] problem with cartographic label placement

 

Hi Uwe,

 

I just tried it. 'B,BR' worked for me. Just don't use quotes before and after 
the separator.

 

Greetings,

Andreas

 

 

On Thu, 12 Jan 2023 at 22:02, Uwe via QGIS-User mailto:qgis-user@lists.osgeo.org> > wrote:

Hello list,

 

for cartographic label placement, according to the help docs it should be 
possible to define position priorities in a ranking.

But when I open the editor and enter a comma separated list like:

 

‘B‘ , ‘BR‘

 

I get an error message. Entering just one value it works. But that doesn’t make 
sense because I need at least two values to let the label move when it collides 
with a feature.

What can be wrong with my input? I use 3.28.

 

Thanks a lot for help.

 

Uwe

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-- 


--
Andreas Neumann

QGIS.ORG   board member (treasurer)

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Re: [QGIS-it-user] Quesito

[Marco Guiducci]

Il 19/01/2023 10:45, Andrea Giudiceandrea via QGIS-it-user ha scritto:

Ciao Luca,
ti inoltro la risposta di Enrico Sferlazza per te che ha erroneamente 
inviato a me invece che alla mailing list.


Se non conosci la procedura suggerita da Enrico, io ti consiglio di 
usare il servizio Web messo a disposizione dall'IGM [1] per effettuare 
la riproiezione del layer e di leggere il manuale utene di QGIS [2] 
[3] [4] e l'introduzione al GIS di QGIS [5] in quanto, dagli 
screenshot che hai fornito, sembra che non ti sia ben chiara la 
procedura da seguire per riproiettare un layer da un CRS ad un altro.
Inoltre ti consiglio anche di leggere il documento redatto dall'IGM in 
merito ai sistemi di riferimento delle coordinate usati in Italia [6].


A presto.

Andrea

[1] https://www.igmi.org/vol/index_file.php
[2] 
https://docs.qgis.org/3.22/it/docs/user_manual/working_with_vector/vector_properties.html#coordinate-reference-system-and-geometry
[3] 
https://docs.qgis.org/3.22/it/docs/user_manual/processing_algs/qgis/vectorgeneral.html#reproject-layer
[4] 
https://docs.qgis.org/3.22/it/docs/user_manual/working_with_projections/working_with_projections.html
[5] 
https://docs.qgis.org/3.22/it/docs/gentle_gis_introduction/coordinate_reference_systems.html

[6] https://www.igmi.org/++theme++igm/pdf/nuova_nota_EPSG.pdf


 Messaggio Inoltrato 
Oggetto:Re: [QGIS-it-user] Quesito
Data:   Wed, 18 Jan 2023 18:39:51 +0100
Mittente:   Ernesto Sferlazza 



Dovresti applicare allo shapefile una trasformazione personalizzata 
basata su griglie di scostamenti, i cosiddetti "grigliati" che 
consentono la trasformazione di precisione tra i  diversi datum 
utilizzati (Roma40 e WGS84). QGis consente di applicare la 
trasformazione anche "al volo" (on the fly). In rete puoi trovare con 
una breve ricerca una versione gratuita dei grigliati nel formato NtV2 
validi su tutto il territorio italiano
s://lists.osgeo.org/mailman/listinfo/qgis-it-user 


a mio parere per sovrapporre su bing non importa scomodare Ntv2 o le 
trasformazioni fornite da IGM. bastano i parametri "blandi" interni a QGis.
intendo: anche se il dato sorgente fosse definito "al millimetro", 
questa "precisione" si perde nella sovrapposizione su un dato fornito 
dal web di cui non c'è assoluta certezza della fonte (e delle eventuali 
trasformazioni che ha subito).
secondo me il problema è nell'assegnare il corretto srid al dato 
sorgente, che in questo caso è epsg 3003.
quindi i documenti segnalati sono sempre da tenere in considerazione e 
vanno conosciuti, soprattutto la nota IGMI che fa chiarezza sui sistemi 
adottati in Italia.

marcog

--
Marco Guiducci 055 4383194
Regione Toscana - Settore Sistema Informativo e pianificazione del territorio

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Re: [Qgis-user] CSV layer, Time column null expressie to test for NULL/empty?

[Raymond Nijssen via QGIS-User]

Or:

coalesce(field, '') in ('', ' ', 'NULL')

Raymond


On 19-01-2023 09:53, kirk via QGIS-User wrote:

You can also use
CASE
When field is null then 123
else 321
end

Kirk Schmidt



Sent from my Galaxy


 Original message 
From: Richard Duivenvoorde via QGIS-User 
Date: 2023-01-18 1:44 p.m. (GMT-04:00)
To: qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] CSV layer, Time column null expressie to test 
for NULL/empty?


Pff, ok found a solution:

"bezoek.begintijd" IS NULL

works

So if I want to test for empty strings, or NULL (like strings), AND real 
NULLS, I use now:


( "bezoek.begintijd" IS NULL   OR   "bezoek.begintijd"  in ('', ' ', 
'NULL') )


Regards,

Richard Duivenvoorde

On 1/18/23 18:31, Richard Duivenvoorde via QGIS-User wrote:
 > We have csv data, which is loaded as layer via the Delimited Text 
Layer provider.

 >
 > The data contains both a date and a time column, which we have to 
format as isodatetime using an QGIS Expression.

 >
 > BUT sometimes time column is empty/no value (in which case we have to 
format it as isoTIME only).

 >
 > So we have to check IF the time column is empty, then only format the 
Date, else use Date AND Time.

 >
 > My problem is that I fail to create an expression for the test IF the 
column (see screenshot) is empty.

 >
 > I thought to use (our column is called "bezoek.begintijd"):
 >
 > "bezoek.begintijd"  in ('', ' ', NULL)
 >
 > BUT this does NOT return True or False, but NULL !!
 >
 > But:
 >
 >
 > ("bezoek.begintijd"  in ('', ' ', NULL)) = NULL
 > does ALSO NOT resolve to True... (also NULL)
 >
 > When the record has no data (the csv holds no data for that record), 
it shows

 > 
 > if it has data:
 > 
 >
 > Anybody an idea what test I can use to test if the time column (which 
is typed as Time) is empty/null/none?

 >
 > Thanks for any pointers.
 >
 > Regards,
 >
 > Richard Duivenvoorde
 >
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Re: [QGIS-it-user] Quesito

[Andrea Giudiceandrea via QGIS-it-user]

Ciao Luca,
ti inoltro la risposta di Enrico Sferlazza per te che ha erroneamente 
inviato a me invece che alla mailing list.


Se non conosci la procedura suggerita da Enrico, io ti consiglio di 
usare il servizio Web messo a disposizione dall'IGM [1] per effettuare 
la riproiezione del layer e di leggere il manuale utene di QGIS [2] [3] 
[4] e l'introduzione al GIS di QGIS [5] in quanto, dagli screenshot che 
hai fornito, sembra che non ti sia ben chiara la procedura da seguire 
per riproiettare un layer da un CRS ad un altro.
Inoltre ti consiglio anche di leggere il documento redatto dall'IGM in 
merito ai sistemi di riferimento delle coordinate usati in Italia [6].


A presto.

Andrea

[1] https://www.igmi.org/vol/index_file.php
[2] 
https://docs.qgis.org/3.22/it/docs/user_manual/working_with_vector/vector_properties.html#coordinate-reference-system-and-geometry
[3] 
https://docs.qgis.org/3.22/it/docs/user_manual/processing_algs/qgis/vectorgeneral.html#reproject-layer
[4] 
https://docs.qgis.org/3.22/it/docs/user_manual/working_with_projections/working_with_projections.html
[5] 
https://docs.qgis.org/3.22/it/docs/gentle_gis_introduction/coordinate_reference_systems.html

[6] https://www.igmi.org/++theme++igm/pdf/nuova_nota_EPSG.pdf


 Messaggio Inoltrato 
Oggetto:Re: [QGIS-it-user] Quesito
Data:   Wed, 18 Jan 2023 18:39:51 +0100
Mittente:   Ernesto Sferlazza 



Dovresti applicare allo shapefile una trasformazione personalizzata 
basata su griglie di scostamenti, i cosiddetti "grigliati" che 
consentono la trasformazione di precisione tra i diversi datum 
utilizzati (Roma40 e WGS84). QGis consente di applicare la 
trasformazione anche "al volo" (on the fly). In rete puoi trovare con 
una breve ricerca una versione gratuita dei grigliati nel formato NtV2 
validi su tutto il territorio italiano___
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QGIS-it-user@lists.osgeo.org
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Re: [Qgis-user] CSV layer, Time column null expressie to test for NULL/empty?

[kirk via QGIS-User]

You can also useCASEWhen field is null then 123else 321endKirk SchmidtSent from 
my Galaxy
 Original message From: Richard Duivenvoorde via QGIS-User 
 Date: 2023-01-18  1:44 p.m.  (GMT-04:00) To: 
qgis-user@lists.osgeo.org Subject: Re: [Qgis-user] CSV layer,
  Time column null expressie to test for NULL/empty? Pff, ok found a 
solution:"bezoek.begintijd" IS NULLworksSo if I want to test for empty strings, 
or NULL (like strings), AND real NULLS, I use now:( "bezoek.begintijd" IS NULL  
 OR   "bezoek.begintijd"  in ('', ' ', 'NULL') )Regards,Richard DuivenvoordeOn 
1/18/23 18:31, Richard Duivenvoorde via QGIS-User wrote:> We have csv data, 
which is loaded as layer via the Delimited Text Layer provider.> > The data 
contains both a date and a time column, which we have to format as isodatetime 
using an QGIS Expression.> > BUT sometimes time column is empty/no value (in 
which case we have to format it as isoTIME only).> > So we have to check IF the 
time column is empty, then only format the Date, else use Date AND Time.> > My 
problem is that I fail to create an expression for the test IF the column (see 
screenshot) is empty.> > I thought to use (our column is called 
"bezoek.begintijd"):> > "bezoek.begintijd"  in ('', ' ', NULL)> > BUT this does 
NOT return True or False, but NULL !!> > But:> > > ("bezoek.begintijd"  in ('', 
' ', NULL)) = NULL> does ALSO NOT resolve to True... (also NULL)> > When the 
record has no data (the csv holds no data for that record), it shows> > 
if it has data:> > > Anybody an idea what test I can use to 
test if the time column (which is typed as Time) is empty/null/none?> > Thanks 
for any pointers.> > Regards,> > Richard Duivenvoorde> > 
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