Re: [Qgis-user] Searching attributes and highlight on map

[qgis-user]

  
  
Not as elegant as Nicolas' explanation using the _expression_ builder,
you can always just open the attribute table and sort on the
attribute you're searching on. You can then easily find the value
you're looking for and select the row. The associated parcel will
now highlight on your canvas and you can also zoom to selection.
This only works if you're searching on a single attribute at the
time - eg, all parcels owned by some person.
  

___
Qgis-user mailing list
Qgis-user@lists.osgeo.org
List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user

Re: [Qgis-user] Searching attributes and highlight on map

[Nicolas Cadieux]

Hi,

You will find go documentation here https://docs.qgis.org/3.16/en/docs/

go to Working with Vector Data (the .gdb file is vector data) 
https://docs.qgis.org/3.16/en/docs/user_manual/working_with_vector/index.html


You will want to make a query using the Query builder.

https://docs.qgis.org/3.16/en/docs/user_manual/working_with_vector/vector_properties.html#query-builder

If you use the query builder, you can select the items that you want and 
then save the selection to a new file. (write click on the layer and 
export selected feature).  You can also filter a file directly by using 
the same query but using the right click on the file in the layer panel 
and select "filter".


You will probably need to save your data in a geopackage (.gpkg) or 
shape (.shp) format as qgis can read but cannot write to .gdb files. 
https://gdal.org/drivers/vector/openfilegdb.html


"Drawbacks of the OpenFileGDB driver:

 *

   Read-only.

 *

   Cannot read data from compressed data in CDF format (Compressed Data
   Format)."

Nicolas


On 2020-12-17 4:09 p.m., j...@destar.net wrote:

Hello List,

I am a new user and new to the list. I am using QGIS version 
3.12.2-București and have imported two .gdb files in QGIS and am 
trying to figure out how to query the data and have it show me on the 
map where it is located. I have been reading through the documentation 
but not quite sure how to phrase my question to get the answer I am 
looking for.


So far I can see my layers on the left hand side and I have been 
trying to use the Expression String Builder to create a query but I 
cannot figure out how to build a query that I can actually just plug 
in one of the attributes and have it show on the map where it is 
located. The data is of a county in Texas and I am trying to find 
parcel IDs by either Prop_ID, GEO_ID, LEGAL_DESC, or OWNER_NAME. I am 
not getting it...unfortunately.


If someone can tell me, what I should be searching on to find my 
answer in SE, Google or the documentation, I will gladly go and read 
up on how to do it, but just not sure how to phrase the questions to 
get the answers.


Thanks for any help or guidance,

Jon
___
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


--
Nicolas Cadieux
https://gitlab.com/njacadieux

___
Qgis-user mailing list
Qgis-user@lists.osgeo.org
List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user

[Qgis-user] Searching attributes and highlight on map

[jonr]

Hello List,

I am a new user and new to the list. I am using QGIS version 
3.12.2-București and have imported two .gdb files in QGIS and am trying 
to figure out how to query the data and have it show me on the map where 
it is located. I have been reading through the documentation but not 
quite sure how to phrase my question to get the answer I am looking for.


So far I can see my layers on the left hand side and I have been trying 
to use the Expression String Builder to create a query but I cannot 
figure out how to build a query that I can actually just plug in one of 
the attributes and have it show on the map where it is located. The data 
is of a county in Texas and I am trying to find parcel IDs by either 
Prop_ID, GEO_ID, LEGAL_DESC, or OWNER_NAME. I am not getting 
it...unfortunately.


If someone can tell me, what I should be searching on to find my answer 
in SE, Google or the documentation, I will gladly go and read up on how 
to do it, but just not sure how to phrase the questions to get the 
answers.


Thanks for any help or guidance,

Jon
___
Qgis-user mailing list
Qgis-user@lists.osgeo.org
List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user

Re: [Qgis-user] Volume calculation - Reg

[Nicolas Cadieux]

This should help

https://youtu.be/EerXfUf-aHo

https://www.pointsnorthgis.ca/blog/how-to-calculate-surfacecut-volume-qgis-advanced/

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 17 déc. 2020 à 04:57, Abhi Shek  a écrit :
> 
> 
> Sir,
> I invite your kind attention to the above subject. I am a beginner in qgis.
> I want to create a raster DEM using Vector Lines. 
> In a nutshell, I want to calculate the planned excavated volume. 
> please guide me in this matter.
> 
> -- 
> with warm regards,
> P S N Abhishek,
> 
> ___
> Qgis-user mailing list
> Qgis-user@lists.osgeo.org
> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
___
Qgis-user mailing list
Qgis-user@lists.osgeo.org
List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user

[Qgis-user] Import mapinfo tabfile

[Weijers, Jean (Kerkrade)]

Hello

I got  mapinfo files (.DAT, .ID, .MAP, .TAB).
I want to import this into QGIS, but I don't get a vectorfile. I see only 
TAB-file.
How can I convert the tab-files into vectorfiles.
Does anaone have a solution.
Thanks in advance,
Jean Weijers

___
Qgis-user mailing list
Qgis-user@lists.osgeo.org
List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user

Re: [Qgis-user] Import mapinfo tabfile

[Philip Barlow]

Hi Jean,

That is a vector file format. A MapInfo layer is made up of those parts, the 
Tab bit will be the only bit you see from the load vector dialogue because it 
is the Tab file that links those parts together.  The DAT file contains the 
attribute table, MAP contains the geometry etc. (see here: MapInfo TAB format - 
Wikipedia).

Just load that TAB bit and the layer will load in, you shouldn't need to 
convert it to another format. QGIS will happily open and edit MapInfo Tabs.


Phil Barlow


From: Qgis-user  On Behalf Of Weijers, Jean 
(Kerkrade)
Sent: 17 December 2020 11:34
To: 'qgis-user@lists.osgeo.org' 
Subject: [Qgis-user] Import mapinfo tabfile

Hello

I got  mapinfo files (.DAT, .ID, .MAP, .TAB).
I want to import this into QGIS, but I don't get a vectorfile. I see only 
TAB-file.
How can I convert the tab-files into vectorfiles.
Does anaone have a solution.
Thanks in advance,
Jean Weijers


Mae'r Awdurdod yn hapus i gyfathrebu yn Gymraeg neu yn Saesneg

The Authority is happy to communicate in Welsh or English


*** 
Website www.pembrokeshirecoast.wales
Follow us on Twitter 
Join us on Facebook
Watch us on Youtube 
Look at us on Flickr


This email and any attached files should only be read by those persons to whom
they are addressed and be used by them only for their intended purpose.
If you are not the intended recipient please destroy all copies and inform the
sender by return email.

Please note that the contents of this email may be subject to public disclosure 
under the Freedom of Information Act 2000 and therefore the confidentiality of 
this message and any reply cannot be guaranteed.

Click here to view PCNPA Privacy Notice – Keeping your Information Safe

For further information on the PCNPA please visit our website at 
www.pembrokeshirecoast.wales

Please consider the environment before printing this email.

Dim ond y personau hynny yr anfonwyd yr e-bost hwn atynt ac unrhyw ffeiliau 
sydd 
ynghlwm ddylid eu darllen, a dim ond hwy ddylid eu defnyddio at y diben y 
bwriadwyd hwy. 
Os nad y chi yw'r person y bwriadwyd eu derbyn a fyddech gystal â dinistrio pob 
copi a rhoi 
gwybod i'r anfonwr gyda throad yr e-bost.

Noder os gwelwch yn dda y gall cynnwys yr e-bost hwn orfod cael ei ddatgelu i'r 
cyhoedd o 
dan Deddf Rhyddid Gwybodaeth 2000 ac felly ni ellir gwarantu cyfrinachedd y 
neges hon 
nac unrhyw ateb. 

Cliciwch yma i weld Hysbysiad Preifatrwydd APCAP - Cadw eich Gwybodaeth yn 
Ddiogel 

Am ragor o wybodaeth am APCAP ymwelwch â'n gwefan ar www.arfordirpenfro.cymru 

Ystyrier yr amgylchedd cyn argraffu'r e-bost hwn os gwelwch yn dda.
___
Qgis-user mailing list
Qgis-user@lists.osgeo.org
List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user

Re: [Qgis-user] pointinformatieon to isohypes

[Weijers, Jean (Kerkrade)]

Hello

I got  mapinfo files (.DAT, .ID, .MAP, .TAB).
I want to import this into QGIS, but I don't get a vectorfile. I see only 
TAB-file.
How can I convert the tab-files into vectorfiles.
Does anaone have a solution.
Thanks in advance,
Jean Weijers

___
Qgis-user mailing list
Qgis-user@lists.osgeo.org
List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user

Re: [Qgis-user] Import mapinfo tabfile

[Kirk Schmidt]

Hi Jean:

The tab file is what you need to open.  The other files make up the rest 
of the components of the vector file similar to a shapefile.  You can 
either drag and drop the tab file into and open QGIS canvas or use the 
add vector layer button.  If you use the later, you can select the file 
type to Mapinfo and the suitable files will be displayed (*.TAB files).


Kirk Schmidt

On 12/17/2020 7:34 AM, Weijers, Jean (Kerkrade) wrote:


Hello

I got  mapinfo files (.DAT, .ID, .MAP, .TAB).

I want to import this into QGIS, but I don’t get a vectorfile. I see 
only TAB-file.


How can I convert the tab-files into vectorfiles.

Does anaone have a solution.

Thanks in advance,

Jean Weijers


___
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


--
Kirk Schmidt, MScF, BScF, RPF
General Manager
Nortek Resource Solutions Inc.
RR # 1
Thorburn, NS
B0K 1W0
Tel (902) 922.3607
Email: k...@nortekresources.com
Web: www.nortekresources.com

___
Qgis-user mailing list
Qgis-user@lists.osgeo.org
List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user

Re: [Qgis-user] QGIS Server error log - Solved

[Thomas Schüttenberg]

OK, what realy fixed the issue of disabled python support in my qgis server was 
the additional(!) installation of the corresponding qgis package from the 
OSGeo4W installer. (As stated inconspicuously in the docs 
https://docs.qgis.org/3.16/en/docs/server_manual/getting_started.html#installation-on-windows)

Although I would have sworen I ticked that package also this time, I obviousely 
didn't.

never mind, cheers!
Thomas
___
Qgis-user mailing list
Qgis-user@lists.osgeo.org
List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user

Re: [QGIS-it-user] R: Modifica valori tabella attributi dopo clip

[Totò]

Buona sera,
ho realizzato un video [0] in cui spiego la differenza tra le funzioni
$lenght e length in QGIS e come realizzare un aggiornamento dei campi
geometrici.

Nel video ci sono i marcatori di capitolo per poter saltare da un argomento
all'altro.

[0] https://youtu.be/1ZIHAnhDhBM

saluti



-
https://pigrecoinfinito.wordpress.com/
--
Sent from: http://osgeo-org.1560.x6.nabble.com/QGIS-Italian-User-f5250612.html
___
QGIS-it-user mailing list
QGIS-it-user@lists.osgeo.org
https://lists.osgeo.org/mailman/listinfo/qgis-it-user

[Qgis-user] New Online Training Course - An Introduction To Using QGIS In Biological Research, 25th - 28th January 2021

[cdmacleod]

_GIS In Ecology_ will be holding a new online training course on using 
QGIS in biological research between the 25th and 28th of January 2021. 
It will be held using the Zoom video-conferencing platform, and will 
consist of four three-hour sessions. One session will need to be 
completed each day. However, you will have a choice of completing it 
between 10:00 and 13:00 Greenwich Mean Time (primarily for those living 
in Europe, Asia and Africa) or 18:00 to 21:00 Greenwich Mean Time 
(primarily for those living in North and South America). This choice of 
time slots for each session allows participants from as wide a range of 
time zones to participate in the course.


Attendance will be limited to a maximum of 24 people per session. The 
fees for this course are GBP 250 per person (with a discounted rate of 
GBP 195 for students, the unwaged and those working for registered 
charities). To book a place on it, or for more information, visit  the 
course's dedicated webpage at 
http://gisinecology.com/online-course-an-introduction-to-using-gis-qgis-in-biological-research/, 
 Alternatively, you can email i...@gisinecology.com with the subject 
line Introductory Online GIS Course January 2021.


This course will be taught by Dr Colin D. MacLeod, the author of _ GIS 
For Biologists: A Practical Introduction For Undergraduates_ [1] 
(Pictish Beast Publications), and will provide an introduction to using 
GIS in a wide variety of biological research situations ranging from the 
basics of making maps through to studying the spread of diseases and 
creating maps of species biodiversity. It will consist of a series of 
background sessions on using GIS mixed in with practical sessions where 
you will work directly with GIS software to complete various tasks which 
biological researchers commonly need to be able to do.


Each three-hour session will consist of a background talk covering a 
specific topic, followed by practical exercises based on instructions 
from one of our workbooks. While you are encouraged to remain online 
during the practical sessions, you can choose to go off-line as you work 
though the exercises (or if you need to take a break). However, if you 
have any questions, the course instructor will be available for you to 
ask any questions you wish at any point.


This course will primarily be based around QGIS (also known as Quantum 
GIS), which provides a user-friendly, open-source, free alternative to 
commercial GIS software packages, and it is becoming increasingly widely 
used in both academic and commercial organisations As a result, it is 
aimed at both those with no GIS experience, but wish to learn how to to 
do GIS with QGIS, and also those who are familiar with using commercial 
GIS software, such as ArcGIS, but who wish to learn how to use QGIS as 
an alternative. However, this course is taught using 
software-independent approach, and it is also open to those who wish to 
learn how to use ArcGIS to do biological GIS.


When you attend this course you will receive a free copy of _GIS For 
Biologists: A Practical Introduction for Undergraduates [1]_as the 
practical exercises in that course are based on the ones contained in 
that book.


At the end of the course, all attendees will receive a certificate of 
attendance and completion. Each certificate is embossed with the GIS In 
Ecology official stamp to prevent its fraudulent reproduction. In 
addition, each certificate has its own unique identification number that 
we will record, along with your name, meaning that we can verify the 
authenticity of the certificates we issue (and the course you have 
completed) on request.


To attend this course, you must have your own laptop computer with an 
appropriate GIS software package installed on it. Our recommended GIS 
software for this course is the freely available QGIS software. For 
those wishing to use QGIS, you will need to download and install QGIS 
2.8.3 (for those using Windows computers) or 2.8.4 (for those using 
Macs) rather than the latest version. The best way to download the 
correct version of QGIS for this course is to use the links on our GIS 
For Biologists webpage, which can be found here [2]. If you would prefer 
to use ESRI's ArcGIS software instead of GIS, this can be accommodated, 
but please let us know at the time of booking that this is the option 
you would like to use.


This course will be followed by a second, more advanced online course 
that will be held between the 15th and the 18th of February 2021 titled 
'An Introduction To Species Distribution Modelling (SDM) In The Marine 
Environment'. More information on this course can be found at 
http://gisinecology.com/online-course-an-introduction-to-species-distribution-modelling-in-the-marine-environment/.


---

==
GIS IN ECOLOGY - Providing Training, Advice And Consultancy On The Use 
Of GIS In Ecology


Web: 

[Qgis-user] Volume calculation - Reg

[Abhi Shek]

Sir,
I invite your kind attention to the above subject. I am a beginner in qgis.
I want to create a raster DEM using Vector Lines.
In a nutshell, I want to calculate the planned excavated volume.
please guide me in this matter.

-- 
with warm regards,
P S N Abhishek,
___
Qgis-user mailing list
Qgis-user@lists.osgeo.org
List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user

Re: [QGIS-it-user] R: Modifica valori tabella attributi dopo clip

[Roberto Marzocchi]

Hai 2 possibilità:



- calcolatore campo --> aggiorna campo --> scegli quello con la lunghezza e usi 
la funzione $length  [in questo modo sovrascrivi la lunghezza corretta]



- calcolatore campo --> nuovo campo (virtuale) --> usi la funzione $length [in 
questo modo crei un nuovo campo con la lunghezza corretta, il virtuale è solo 
un mio suggerimento]



Forse mi sono lasciato prendere dallo "spiegone" sui campi virtuali è ho dato 
per scontata la funzione che calcola la lunghezza di una linea ossia la 
funzione $length  



R


Eng. Roberto Marzocchi, PhD

CTO - Chief Technology Officer

Gter srl (Unige spin-off)

Via Ruffini 9R - 16128 Genova 

http://P.IVA/CF 01998770992 

ph: 010-0899150 - mob: 349-8786575 

E-mail: mailto:roberto.marzoc...@gter.it http://www.gter.it 



-- 

Gter social 

http://www.twitter.com/Gteronline - http://www.facebook.com/Gteronline 

http://www.linkedin.com/company/gter-srl-innovazione-in-geomatica-gnss-e-gis 



- 

Please consider the environment before printing this email! 








 Attivato gio, 17 dic 2020 10:07:22 +0100   ha scritto 




Grazie mille Roberto, 
credo teoricamente di aver capito ma in pratica no. 
Come faccio a sostituire i valori tabellari della tabella originaria 
con quelli derivati?? 
Vado sul calcolatore campi della tabella, creo un campo virtuale Lung2 
e vado a selezionare da Campi e valori la colonna lunghezza?? Facendo 
così mi crea una colonna Lung2 con i medesimi valori. Cosa sbaglio?? 
 
Grazie 
 
F 
 
 
 
 
Roberto Marzocchi  ha scritto: 
 
> E' sufficiente aggiornare i valori di lunghezze con il calcolatore campi.  
> 
> In generale i campi SHAPE_LENGTH (o AREA) presenti nei file sono un 
> retaggio dell'ecosistema ESRI (o simili).  
> 
> Per vari SW non solo ESRI che però traggono ispirazione credo 
> fossero campi virtuali ma quando il dato viene esportato sono campi 
> a tutti gli effetti. Quindi appartengono alla componente semantica 
> del dato e non sono collegati con la geometria! 
> Il mio consiglio è sempre quello di eliminarli e sostituirli da 
> campi virtuali (o farlo solo se ti serve come nel tuo caso) 
> 
> R 
> 
> 
> Eng. Roberto Marzocchi, PhD 
> 
> CTO - Chief Technology Officer 
> 
> Gter srl (Unige spin-off) 
> 
> Via Ruffini 9R - 16128 Genova 
> 
> http://P.IVA/CF 01998770992 
> 
> ph: 010-0899150 - mob: 349-8786575 
> 
> E-mail: mailto:mailto:roberto.marzoc...@gter.it http://www.gter.it 
> 
> 
> 
> -- 
> 
> Gter social 
> 
> http://www.twitter.com/Gteronline - http://www.facebook.com/Gteronline 
> 
> http://www.linkedin.com/company/gter-srl-innovazione-in-geomatica-gnss-e-gis 
> 
> 
> 
> - 
> 
> Please consider the environment before printing this email! 
> 
> 
> 
> 
> 
> 
>  Attivato gio, 17 dic 2020 09:30:44 +0100 
>  ha scritto  
> 
> 
> Buiongiorno, 
> Avrei un problema che magari per molti di voi potrebbe essere banale. 
> Vorrei calcolare i km di rete stradale che ci sono all'interno di un 
> bacino idrografico. Pe fare questo sto utilizzando lo strumento "Clip" 
> di geprocessing. Fino a qua tutto bene riesco a tagliare lo shape 
> strade ed avere solo la rete stradate che ricade all'interno del 
> bacino. Ora per calcolare la lunghezza totale delle strade ho 
> utilizzato lo strumento statistics pannel in cui dalla tabella 
> attributi del file ritagliato calcolo la somma delle lunghezze delle 
> strade. Problemala somma si riferisce ai valori tabellari 
> dell'elemento strada prima del ritaglio. Qualcuno potrebbe indicarmi 
> una soluzione in modo da poter aggiornare i valori della tabella 
> attributi dello shape tagliato? 
> 
> Grazie 
> 
> 
> Francesco 
> 
> 
> 
> ___ 
> QGIS-it-user mailing list 
> mailto:mailto:QGIS-it-user@lists.osgeo.org 
> https://lists.osgeo.org/mailman/listinfo/qgis-it-user___
QGIS-it-user mailing list
QGIS-it-user@lists.osgeo.org
https://lists.osgeo.org/mailman/listinfo/qgis-it-user

Re: [QGIS-it-user] R: Modifica valori tabella attributi dopo clip

[fpalmas]

Grazie mille Roberto,
credo teoricamente di aver capito ma in pratica no.
Come faccio a sostituire i valori tabellari della tabella originaria  
con quelli derivati??
Vado sul calcolatore campi della tabella, creo un campo virtuale Lung2  
e vado a selezionare da Campi e valori la colonna lunghezza?? Facendo  
così mi crea una colonna Lung2 con i medesimi valori. Cosa sbaglio??


Grazie

F




Roberto Marzocchi  ha scritto:


E' sufficiente aggiornare i valori di lunghezze con il calcolatore campi. 

In generale i campi SHAPE_LENGTH (o AREA) presenti nei file sono un  
retaggio dell'ecosistema ESRI (o simili). 


Per vari SW non solo ESRI che però traggono ispirazione credo  
fossero campi virtuali ma quando il dato viene esportato sono campi  
a tutti gli effetti. Quindi appartengono alla componente semantica  
del dato e non sono collegati con la geometria!
Il mio consiglio è sempre quello di eliminarli e sostituirli da  
campi virtuali (o farlo solo se ti serve come nel tuo caso)


R


Eng. Roberto Marzocchi, PhD

CTO - Chief Technology Officer

Gter srl (Unige spin-off)

Via Ruffini 9R - 16128 Genova

http://P.IVA/CF 01998770992

ph: 010-0899150 - mob: 349-8786575

E-mail: mailto:roberto.marzoc...@gter.it http://www.gter.it



--

Gter social

http://www.twitter.com/Gteronline - http://www.facebook.com/Gteronline

http://www.linkedin.com/company/gter-srl-innovazione-in-geomatica-gnss-e-gis



-

Please consider the environment before printing this email!






 Attivato gio, 17 dic 2020 09:30:44 +0100   
 ha scritto 



Buiongiorno,
Avrei un problema che magari per molti di voi potrebbe essere banale.
Vorrei calcolare i km di rete stradale che ci sono all'interno di un
bacino idrografico. Pe fare questo sto utilizzando lo strumento "Clip"
di geprocessing. Fino a qua tutto bene riesco a tagliare lo shape
strade ed avere solo la rete stradate che ricade all'interno del
bacino. Ora per calcolare la lunghezza totale delle strade ho
utilizzato lo strumento statistics pannel in cui dalla tabella
attributi del file ritagliato calcolo la somma delle lunghezze delle
strade. Problemala somma si riferisce ai valori tabellari
dell'elemento strada prima del ritaglio. Qualcuno potrebbe indicarmi
una soluzione in modo da poter aggiornare i valori della tabella
attributi dello shape tagliato?

Grazie


Francesco



___
QGIS-it-user mailing list
mailto:QGIS-it-user@lists.osgeo.org
https://lists.osgeo.org/mailman/listinfo/qgis-it-user




___
QGIS-it-user mailing list
QGIS-it-user@lists.osgeo.org
https://lists.osgeo.org/mailman/listinfo/qgis-it-user

[QGIS-it-user] R: Modifica valori tabella attributi dopo clip

[Roberto Marzocchi]

E' sufficiente aggiornare i valori di lunghezze con il calcolatore campi. 

In generale i campi SHAPE_LENGTH (o AREA) presenti nei file sono un retaggio 
dell'ecosistema ESRI (o simili). 

Per vari SW non solo ESRI che però traggono ispirazione credo fossero campi 
virtuali ma quando il dato viene esportato sono campi a tutti gli effetti. 
Quindi appartengono alla componente semantica del dato e non sono collegati con 
la geometria!
Il mio consiglio è sempre quello di eliminarli e sostituirli da campi virtuali 
(o farlo solo se ti serve come nel tuo caso)

R


Eng. Roberto Marzocchi, PhD

CTO - Chief Technology Officer

Gter srl (Unige spin-off)

Via Ruffini 9R - 16128 Genova 

http://P.IVA/CF 01998770992 

ph: 010-0899150 - mob: 349-8786575 

E-mail: mailto:roberto.marzoc...@gter.it http://www.gter.it 



-- 

Gter social 

http://www.twitter.com/Gteronline - http://www.facebook.com/Gteronline 

http://www.linkedin.com/company/gter-srl-innovazione-in-geomatica-gnss-e-gis 



- 

Please consider the environment before printing this email! 






 Attivato gio, 17 dic 2020 09:30:44 +0100   ha 
scritto 


Buiongiorno, 
Avrei un problema che magari per molti di voi potrebbe essere banale. 
Vorrei calcolare i km di rete stradale che ci sono all'interno di un 
bacino idrografico. Pe fare questo sto utilizzando lo strumento "Clip" 
di geprocessing. Fino a qua tutto bene riesco a tagliare lo shape 
strade ed avere solo la rete stradate che ricade all'interno del 
bacino. Ora per calcolare la lunghezza totale delle strade ho 
utilizzato lo strumento statistics pannel in cui dalla tabella 
attributi del file ritagliato calcolo la somma delle lunghezze delle 
strade. Problemala somma si riferisce ai valori tabellari 
dell'elemento strada prima del ritaglio. Qualcuno potrebbe indicarmi 
una soluzione in modo da poter aggiornare i valori della tabella 
attributi dello shape tagliato? 
 
Grazie 
 
 
Francesco 
 
 
 
___ 
QGIS-it-user mailing list 
mailto:QGIS-it-user@lists.osgeo.org 
https://lists.osgeo.org/mailman/listinfo/qgis-it-user___
QGIS-it-user mailing list
QGIS-it-user@lists.osgeo.org
https://lists.osgeo.org/mailman/listinfo/qgis-it-user

[QGIS-it-user] Modifica valori tabella attributi dopo clip

[fpalmas]

Buiongiorno,
Avrei un problema che magari per molti di voi potrebbe essere banale.
Vorrei calcolare i km di rete stradale che ci sono all'interno di un  
bacino idrografico. Pe fare questo sto utilizzando lo strumento "Clip"  
di geprocessing. Fino a qua tutto bene riesco a tagliare lo shape  
strade ed avere solo la rete stradate che ricade all'interno del  
bacino. Ora per calcolare la lunghezza totale delle strade ho  
utilizzato lo strumento statistics pannel in cui dalla tabella  
attributi del file ritagliato calcolo la somma delle lunghezze delle  
strade. Problemala somma si riferisce ai valori tabellari  
dell'elemento strada prima del ritaglio. Qualcuno potrebbe indicarmi  
una soluzione in modo da poter aggiornare i valori della tabella  
attributi dello shape tagliato?


Grazie


Francesco



___
QGIS-it-user mailing list
QGIS-it-user@lists.osgeo.org
https://lists.osgeo.org/mailman/listinfo/qgis-it-user