[Qgis-user] Layer actions in one clic ?

[Didier Peeters]

Dear QGIS users,

I have been using actions in QGIS for years and I find them very useful and 
much easier to create than plugins. As a reminder, they can have 4 different 
scopes, which are 'Field', 'Feature', 'Layer' and 'Canvas'.

However, there is one thing I don't understand: when choosing 'Canvas', it is 
always necessary to click on an layer element after choosing the action to be 
used in the attributes toolbar (with the action button - the little wheel). Why 
is this? Wouldn't it be easier to immediately trigger an action by clicking on 
its name in the toolbar?
In particular, I have defined a Python action that fetches a file containing 
data to be imported into a database, with no specific link to a particular 
entity.

So, have I misunderstood the use of the action? Am I missing something?

Or maybe better, would it be possible to have actions not related to any layer ?

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Re: [Qgis-user] importing data to map

[Didier Peeters]

Hi,

I don't know about your data or what you call a "function" here, but yes you 
need to have it loaded in QGis as a layer (with or without geometry).  To do so 
and supposing you have a .xls or .xlsx file you can install the 'Spreadsheet 
Layers' plugin, which  adds a "Add spreadsheet layer" entry in "Layer" / "Add 
new Layer" menu and a corresponding button in the "Layers" toolbar.  
  Alternatively you could 
maybe convert your data into a .csv file and load it as well.   Once your file 
is loaded you should be able to create the relation.  

Didier

> Le 21 mars 2020 à 08:49, Boaz Bar Ilan  a écrit :
> 
> hi 
> thanks
>  I need  to present all the functions as one layer so how can this help me?
> 
> ‫בתאריך יום ו׳, 20 במרץ 2020 ב-15:39 מאת ‪Didier Peeters‬‏ 
> <‪dpeet...@ulb.ac.be ‬‏>:‬
> Hi,
> 
> You need to use a Relation, in the project properties (Menu: Project > 
> Properties > Relations).  
> 
> See these videos to understand how it works :
> 
> https://youtu.be/MeBnasFHGGQ 
> https://youtu.be/OowgI1b2ihw 
> 
> Cheers,
> 
> Didier
> 
> > Le 20 mars 2020 à 12:33, Boaz Bar Ilan  > > a écrit :
> > 
> > hi there
> >  I got data xcls which describes functions in relation to parcells
> > im trying to import this spreadsheet to a map of parcells  and what happen 
> > of course that if there are 2 functions in the same parcel - it shows only 
> > one!
> > how can I show  2 functions or more related to the same parcel  ?
> > 
> > I can use the add polygon feature but than it should be done manually one 
> > by one
> > is there different way ?
> > thanks
> > boaz
> > 
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Re: [Qgis-user] importing data to map

[Didier Peeters]

Hi,

You need to use a Relation, in the project properties (Menu: Project > 
Properties > Relations).  

See these videos to understand how it works :

https://youtu.be/MeBnasFHGGQ
https://youtu.be/OowgI1b2ihw

Cheers,

Didier

> Le 20 mars 2020 à 12:33, Boaz Bar Ilan  a écrit :
> 
> hi there
>  I got data xcls which describes functions in relation to parcells
> im trying to import this spreadsheet to a map of parcells  and what happen of 
> course that if there are 2 functions in the same parcel - it shows only one!
> how can I show  2 functions or more related to the same parcel  ?
> 
> I can use the add polygon feature but than it should be done manually one by 
> one
> is there different way ?
> thanks
> boaz
> 
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Re: [Qgis-user] (no subject)

[Didier Peeters]

Hi Dickson, 

Since QGIS 3.x there is an import/export functionality in the Project menu, 
with a specific option for DWG/DXF files.  

Didier

> Le 26 janv. 2019 à 23:24, Dickson Taunagita  a écrit :
> 
> Hi,
> 
> I just downloaded QGIS 3.4.4 and currently (trying to) teach myself and need 
> some assistance.
> 
> How can I key in coordinates to add a point in QGIS 3.4.4?
> I am currently experiencing an error in adding an AutoCAD dxf file in QGIS 
> 3.4.4.  I am getting the "CRS was undefined ..." error.
> Your assistance will be greatly appreciated.
> 
> Dickson
> 
> 
> 
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Re: [Qgis-user] Missing detached panels

[didier peeters]

Yes I see that too, with QGis 3.4.2 on Mac 10.13 .  

Didier

> Le 29 nov. 2018 à 11:30, Jesús Lopez  a écrit :
> 
> Does anyone else have this problem?
> 
> After hide qgis (cmd+H) when you return to application any open detached 
> panels disappear and have to reopen them manually.
> 
> Mac 10.11.6 and Qgis 3.4.2
> 
> Regards
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Re: [Qgis-user] QGIS 3.2.1 Mac Map Area Issue

[didier peeters]

Same problem for me on QGIS 3.2.1 and mac OS 10.13.6, had to downgrade to 3.2.0 
.


> Le 7 août 2018 à 17:15, Daniel Marcum  a écrit :
> 
> I just updated to QGIS 3.2.1 on macOS 10.13.6. The map area is small (doesn’t 
> fill the part of the window that it should). Any ideas why this is happening? 
> Wasn’t an issue in 3.2. Attached is a screenshot.
> 
> 
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Re: [Qgis-user] good afternoon [Mac kyngchaos downloads]

[didier peeters]

Wafa’a, I don’t understand your problem.  Just do the following:

download QGis from this link : 
http://qgis.org/downloads/macOS/QGIS-macOS-3.2.0-1.dmg 

and do the steps 1 2 3 in that order …  Beware that at first step you need to 
install Python 3.6.x (i.e. apparently currently 3.6.6) , not 3.7 .

HTH
Didier

> Le 18 juil. 2018 à 08:02, Wafa'a Madi  a écrit :
> 
> could you help install QGIS as i tried several times and it didn’t work as i 
> said in my pervious mail , when i install it it doesn’t appear like this 
> picture just the number 3 file appear 
> 
> 
>> On Jul 16, 2018, at 7:23 PM, William Kyngesburye > > wrote:
>> 
>> That's an old screenshot of my QGIS page.  All current Mac downloads are now 
>> available from the QGIS website (there's a link on my QGIS page now).
>> 
>>> On Jul 16, 2018, at 10:07 AM, Wafa'a Madi >> > wrote:
>>> 
>>> Hello,
>>> 
>>> I’m trying to download QGIS on my macOS high sierra10.13.5 but the page on 
>>> www.kyngchaos.com  website doesn’t appear like 
>>> it should be ( i don’t see long support or stable like others see) and i 
>>> download it by QGIS website directly but it does’t have all files only 2 
>>> and 3 and it doesn’t work either.
>>> Please could you help me with this problem
>>> this page that i want to access but i can’t find it 
>>> 
>>> 
>>> 
>>> Regards,
>>> Wafa'a
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>> -
>> William Kyngesburye 
>> http://www.kyngchaos.com/ 
>> 
>> Theory of the Universe
>> 
>> There is a theory which states that if ever anyone discovers exactly what 
>> the universe is for and why it is here, it will instantly disappear and be 
>> replaced by something even more bizarrely inexplicable.  There is another 
>> theory which states that this has already happened.
>> 
>> -Hitchhiker's Guide to the Galaxy 2nd season intro
>> 
>> 
> 
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Re: [Qgis-user] Sth similar to GEarthView in qgis3

[didier peeters]

What about the QuickMapServices plugin ?
For Google you need to get the contributed pack in the settings.  

Didier


> Le 10 avr. 2018 à 09:53, Piotr Kania  a écrit :
> 
> Hi!
> I look for "sth" similar to GEarthView plugin's functionality in qgis3 - 
> maybe there is some python code, that could do the "magic"?
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Re: [Qgis-user] Assistance for Mac User

[didier peeters]

Hi, 
This is not specific to Mac Os : see this page, and more specifically Luigi 
Pirelli’s answer : 
https://gis.stackexchange.com/questions/137855/importing-svg-symbols-into-qgis#137886
 


Didier

> Le 21 nov. 2017 à 09:26, Grant Boxer  a écrit :
> 
> I have an associate with a Mac and I am trying to found out how and where to 
> put custom svg files on a Mac so the QGIS recognises them. I am a PC user so 
> not familiar with Mac procedures.
>  
> Grant Boxer
> Perth, Western Australia
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Re: [Qgis-user] Value relations in QGIS

[didier peeters]

Hello Randy,

I haven’t been working with value relations very recently but what I used to do 
to easily share it with other users was to save everything in the project file, 
then duplicate this file and replace the login name (or anything else that 
would need to be adapted) with a text editor. 

HTH,

Didier



> Le 17 mars 2017 à 16:42, Randal Hale  a 
> écrit :
> 
> Question.
> 
> I'm working with a group and I'm attempting to "idiot proof" editing a bit - 
> well - at least the attribution. I've set up a database (postgresql/postgis) 
> and went so far as to set up foreign keys. I set up value relations and we 
> now have drop down lists for about everything.
> 
> I decided to save what I am doing. I saved the data layer as a qlr. I saved 
> the style as a qml. I re-added the data using the qlr and the style using the 
> qml. EXCEPT - it didn't restore the value relations. They are in the qml file:
> 
>
> 
>  UseCompleter="0" fieldEditable="1" Key="id" constraint="" 
> Layer="contractor_tbl20170317111848429" Value="contractor" labelOnTop="0" 
> constraintDescription="" AllowMulti="0" notNull="0"/>
> 
>   
> 
> the Layer -> contractor_tbl20170317111848429 isn't quite the right name but 
> I'm assuming that's some internal QGIS layer naming. I even changed it - it 
> wouldn't restore.
> 
> I did more digging and discovered the value relation is also in the qlr file 
> - but it's not restoring the widgets either. Maybe it doesn't matter that I 
> saved a qml.
> 
> Question is - should it restore? Or are value relations (widgets) just for 
> that QGIS session - so I need to set this up 5 times for 5 people? Which I 
> don't mind doing - I was under the impression this saved/restored with the 
> qlr/qml.
> 
> QGIS: 2.18.4
> OS: Ubuntu (mate) 16.04
> QGIS repo/Ubuntu GIS repo.
> 
> Thanks
> 
> Randy
> 
> 
> 
> -- 
> -
> Randal Hale
> North River Geographic Systems, Inc
> http://www.northrivergeographic.com
> 423.653.3611 rjh...@northrivergeographic.com
> twitter:rjhale
> 
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Re: [Qgis-user] Copy/paste non geometric data in QGis

[didier peeters]

Thank you Ramon for these observations.  In my case I copied something like 25 
rows, so it can’t be related to some lack of memory. 
I will write a bug report.


> Le 3 févr. 2017 à 00:56, Ramon Andinach <cust...@westnet.com.au> a écrit :
> 
> I can’t help, but I bumped into something like that recently 2.18.2 on Sierra 
> trying to copy something like 4,700,000 points from a csv into an identically 
> formatted spatialite layer.
> 
> I can offer some other observations.
> 1. I couldn’t copy the whole lot, but I could copy it in lots of 1,000,000 up 
> to the last packet and then it crashed.
> 2. I could copy the whole thing into a QGIS temporary layer.
> 3. I could copy the whole thing into a shape layer.
> 4. I could copy the whole lot from the temporal layer into the spatialite 
> layer.
> 
> There was an update that caused a restart, and it seemed to work after that. 
> 
> Except that it worked fine copying the whole lot into a different format than 
> spatialite (and particularly the temporary layer) I wondered if it was a 
> memory hang up of some sort.
> 
> 
>> On 3 Feb 2017, at 00:08, didier peeters <dpeet...@ulb.ac.be> wrote:
>> 
>> Hello everybody,
>> 
>> I’m trying to copy/paste rows between two tables (layers without geometries) 
>> loaded in QGis.  They have the same structure but one is a postgis layer and 
>> the other is a csv file.  When a click on the ‘Paste’ button in the 
>> attribute table window QGis crashes immediately.  I’m doing this on Mac OS 
>> Sierra with QGis 2.18.2 and QGis 2.14.10 (both from Kyngchaos).  My 
>> objective is to provide QGis beginners a simple way to load data from their 
>> MS Excel world to PostGis, where the data will afterward be processed and 
>> then displayed in QGis. 
>> 
>> Does anybody know anything about this problem ?
>> 
>> Thanks !
>> 
>> Didier
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[Qgis-user] Copy/paste non geometric data in QGis

[didier peeters]

Hello everybody,

I’m trying to copy/paste rows between two tables (layers without geometries) 
loaded in QGis.  They have the same structure but one is a postgis layer and 
the other is a csv file.  When a click on the ‘Paste’ button in the attribute 
table window QGis crashes immediately.  I’m doing this on Mac OS Sierra with 
QGis 2.18.2 and QGis 2.14.10 (both from Kyngchaos).  My objective is to provide 
QGis beginners a simple way to load data from their MS Excel world to PostGis, 
where the data will afterward be processed and then displayed in QGis. 

Does anybody know anything about this problem ?

Thanks !

Didier
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Re: [Qgis-user] QGIS 2.16 for OS X?

[didier peeters]

Hi Matthias,

I tried « brew install qgis-216 » but got the error « No available formula with 
the name "qgis-216" » 
I’m using the tap osgeo/osgeo4mac.  

What am I doing wrong ?

Thanks for your help.
Didier


> Le 9 août 2016 à 19:36, Matthias Kuhn  a écrit :
> 
> Or use homebrew to install it as long as there's no ready to use bundle
> around. There is an updated formula for QGIS 2.16 waiting to be
> installed on OSX :)
> 
> https://github.com/OSGeo/homebrew-osgeo4mac/pull/146
> 
> Matthias
> 
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Re: [Qgis-user] troubles with QGis Atlas

[didier peeters]

Thank you very much, Nyall, your solution works perfectly !
Didier

> Le 12 janv. 2016 à 11:35, Nyall Dawson <nyall.daw...@gmail.com> a écrit :
> 
> On 12 January 2016 at 12:01, Nyall Dawson <nyall.daw...@gmail.com> wrote:
>> 
>> On 12 Jan 2016 8:36 AM, "didier peeters" <dpeet...@ulb.ac.be> wrote:
>>> 
>>> Thank you Nyall.
>>> 
>>> Oh, this could be the reason.  To clarify a little bit, my field is not
>>> called « id » and my coverage layer is a Postgis table, the field I use has
>>> a PK and the geometry layer is a Postgis view with numerical values that I
>>> represent with proportional circles.
>>> Does it mean that what I want to do is not possible ?  Or should I use
>>> another data source ?
>> 
>> It should be possible. Can you share a few rows from both tables?
>> 
> 
> (sharing the solution with the list)
> 
> After looking at your data, the ID field in your database is a string.
> Feature IDs in QGIS are always numeric, so QGIS generates it's own
> feature ID and can't reuse the database's primary key.
> 
> The solution is to update your expression. Instead of "id_field" =
> @atlas_featureid'
> 
> Use
> 
> "id_field"  = attribute( @atlas_feature,'id_field' )
> 
> Nyall
> 
> 
> 
>> Nyall
>> 
>>> 
>>> Didier
>>> 
>>> 
>>>> Le 11 janv. 2016 à 21:26, Nyall Dawson <nyall.daw...@gmail.com> a écrit
>>>> :
>>>> 
>>>> On 12 January 2016 at 02:18, didier peeters <dpeet...@ulb.ac.be> wrote:
>>>>> Hello,
>>>>> 
>>>>> I’ve started to use the Atlas in QGis composer: I use a non-geometry
>>>>> table
>>>>> as coverage layer, providing the feature id’s and corresponding labels
>>>>> for
>>>>> my maps, and I display always the same extent but with different data
>>>>> of
>>>>> course, using a rule-based style like ‘ "field" = @atlas_featureid'.
>>>>> At
>>>>> first it worked fine but now, the atlas mistakes @atlas_featurenumber
>>>>> for
>>>>> @atlas_featureid, i.e. instead of displaying the data corresponding to
>>>>> the
>>>>> feature id it displays the data corresponding to the number of the
>>>>> feature
>>>>> (~ the row number, as some are filtered out), but selects properly the
>>>>> labels corresponding to the feature value.  So I obtain maps with a
>>>>> title
>>>>> which is not related to the content !
>>>>> In the expression editor @atlas_featureid and @atlas_featurenumber are
>>>>> previewed with the same Current value although they are different !
>>>>> 
>>>>> Does anyone have an idea about this ?
>>>> 
>>>> Keep in mind that feature id's might not be predictable, depending on
>>>> your data source. They aren't user visible, and as such aren't
>>>> suitable for a join like this.
>>>> 
>>>> Did you mean instead to use a field called "id" from your coverage
>>>> layer?
>>>> 
>>>> Nyall
>>>> 
>>>>> 
>>>>> I use QGis 2.12.1 on Mac.
>>>>> 
>>>>> Didier
>>>>> 
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[Qgis-user] troubles with QGis Atlas

[didier peeters]

Hello,

I’ve started to use the Atlas in QGis composer: I use a non-geometry table as 
coverage layer, providing the feature id’s and corresponding labels for my 
maps, and I display always the same extent but with different data of course, 
using a rule-based style like ‘ "field" = @atlas_featureid'.  At first it 
worked fine but now, the atlas mistakes @atlas_featurenumber for 
@atlas_featureid, i.e. instead of displaying the data corresponding to the 
feature id it displays the data corresponding to the number of the feature (~ 
the row number, as some are filtered out), but selects properly the labels 
corresponding to the feature value.  So I obtain maps with a title which is not 
related to the content !
In the expression editor @atlas_featureid and @atlas_featurenumber are 
previewed with the same Current value although they are different !

Does anyone have an idea about this ?

I use QGis 2.12.1 on Mac.

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Re: [Qgis-user] SVG borders with data defined override in Postgis layer

[didier peeters]

I can refine my description : 

the problem occurs on the border width only, the border color works fine.  

Still, no one has ever met this problem ?

Didier


> Le 17 sept. 2015 à 22:37, didier peeters <dpeet...@ulb.ac.be> a écrit :
> 
> Hello,
> 
> I have a problem with the border parameter of SVG markers in QGis 2.10 (on 
> Mac OS 10.10.5); I’m using PostGIS layers and the SVG markers properties are 
> determined by the DB, i.e. the svg itself, the color, the rotation, with data 
> define override.  I also want to define the border color and width the same 
> way but it doesn’t work, nothing happens.  If I deactivate the overriding 
> everything is correct.  
> For the color I use a varchar type (same as for the color of the svg itself) 
> and for the width a numeric (also tried real, double precision, …) .
> 
> I haven’t found any bug report about this.  Any idea ?
> 
> Didier
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Re: [Qgis-user] SVG borders with data defined override in Postgis layer

[didier peeters]

Hi Andreas, 

yes, I can define a border width ‘manually’ in the styling of the layer, but I 
cannot override this with a value from Postgis.
I will send you a svg.

Didier



See also 
http://blog.sourcepole.ch/2011/06/30/svg-symbols-in-qgis-with-modifiable-colors/
 
<http://blog.sourcepole.ch/2011/06/30/svg-symbols-in-qgis-with-modifiable-colors/>

> Le 18 sept. 2015 à 14:42, Andreas Neumann <a.neum...@carto.net 
> <mailto:a.neum...@carto.net>> a écrit :
> 
> Hi Didier,
> 
> Did you prepare your SVG file accordingly?
> 
> You need something like the following in your SVG file wherever you want to 
> dynamically replace properties:
> 
>  stroke-width="param(stroke-width) 10" width="100" height="100">
> 
> Can you share your SVG file so I can have a look if it is properly prepared?
> 
> Andreas
> 
> On 18.09.2015 14:36, didier peeters wrote:
> Qgis-user@lists.osgeo.org <mailto:Qgis-user@lists.osgeo.org>
> 
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>> I can refine my description : 
>> the problem occurs on the border width only, the border color works fine.  
>> 
>>> 
>>> 
>>> Still, no one has ever met this problem ?
>>> 
>>> Didier
>>> 
>>> Le 17 sept. 2015 à 22:37, didier peeters <dpeet...@ulb.ac.be> 
>>> <mailto:dpeet...@ulb.ac.be> a écrit :
>>> I have a problem with the border parameter of SVG markers in QGis 2.10 (on 
>>> Mac OS 10.10.5); I’m using PostGIS layers and the SVG markers properties 
>>> are determined by the DB, i.e. the svg itself, the color, the rotation, 
>>> with data define override. I also want to define the border color and width 
>>> the same way but it doesn’t work, nothing happens.  If I deactivate the 
>>> overriding everything is correct.  
>> Qgis-user@lists.osgeo.org <mailto:Qgis-user@lists.osgeo.org>
>>> 
>>> 
>>> 
>>> 
>>> ___
>> http://lists.osgeo.org/mailman/listinfo/qgis-user 
>> <http://lists.osgeo.org/mailman/listinfo/qgis-user>
>>> Hello,
>>> I haven’t found any bug report about this. Any idea ?
>>> Qgis-user mailing list
>>>> For the color I use a varchar type (same as for the color of the svg 
>>>> itself) and for the width a numeric (also tried real, double precision, …) 
>>>> .
>>>> Didier
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Re: [Qgis-user] Adding a Mac to a group of PCs

[didier peeters]

Arni,

Postgis is certainly an excellent option.  
Regarding the data sources, currently QGis cannot use relative paths to files 
or photos (at least) but to svg's in styling (and maybe other, I don’t have an 
exhaustive list). One option to bypass the files issue would be to use a web 
server and store URL instead of internal paths.  For instance you could have a 
web server, and whenever a file (or photo) is added generate with a Postgresql 
trigger the corresponding url in another attribute, making the file available 
to all the users, either through a form or through an action.  

Didier


> Le 1 sept. 2015 à 17:45, Árni Geirsson  a écrit :
> 
> Thanks Jim
> Your answer encourages me to try the PostGIS option - it obviously has some 
> other useful advantages. But your reply also made me realize that the problem 
> is really that much of the data I have is on another network share - hence 
> the problem with the paths. I should simply move the data so that everything 
> is on the same share and and then, relative paths will solve the problem.
> Again, thank you for a very helpful answer.
> 
> Arni
> 
> 
> Árni Geirsson
> Alta ehf // +354 582 5000 // +354 897 9549
> www.alta.is   // Alta á Twitter 
>  // Alta á Facebook 
> 
> 
> On Tue, Sep 1, 2015 at 3:26 PM, James Keener  > wrote:
> Re: postgresql in my experience it's neither cumbersome nor slow. Feel free 
> to email me for help if you would like to explore that route.
> 
> Are the paths in you qgs file relative or absolute? If their relative, is the 
> issue that the path separator is different? If that is the issue, I would 
> file a bug report. (If they are absolute, try saving them with relative 
> paths.)
> 
> Jim
> 
> On September 1, 2015 11:12:10 AM EDT, "Árni Geirsson"  > wrote:
> Hi
> I am adding a Mac to a local network of PCs. The Mac user uses QGIS (as well 
> as the PCs) and accesses data on a shared drive. Now the problem comes up 
> that data sources have different paths to the shared drive in each operating 
> system, making cooperation difficult. On the other hand, since the .qgs file 
> is easy to edit, some simple solution might map the paths automatically on 
> open and back on save, to compensate for these differences. And maybe there 
> is some other solution out there. 
> I realize that having all shared data in PostGIS might be one way to solve 
> this but I suspect that it might be both slower and a little more cumbersome.
> All thoughts and suggestions are highly appreciated.
> 
> Árni Geirsson
> 
> 
> 
> Qgis-user mailing list
> Qgis-user@lists.osgeo.org 
> http://lists.osgeo.org/mailman/listinfo/qgis-user 
> 
> -- 
> Sent from my Android device with K-9 Mail. Please excuse my brevity.
> 
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Re: [Qgis-user] relative path in QGis forms

[didier peeters]

Hi Michaël,

thanks for answering !  I just opened a ticket.

cheers,

Didier

 Le 30 août 2015 à 14:45, kimaidou kimai...@gmail.com 
 mailto:kimai...@gmail.com a écrit :
 
 Hi
 
 Indeed this would be great, and consistent with the other features using path 
 to resources like SVG. At present the path to files or photos is only 
 stored as absolute path, not taking into account the setting in the QGIS 
 General Options tab.
 
 Can you please open an issue in the hub so that we do not forget about it : 
 http://hub.qgis.org http://hub.qgis.org/ ?
 
 Regards
 Michaël
 
 2015-08-25 14:12 GMT+02:00 didier peeters dpeet...@ulb.ac.be 
 mailto:dpeet...@ulb.ac.be:
 Hello,
 
 I was wondering about the possibility to store and use relative paths with 
 the Photo widget in QGis forms; I have a project accessing Postgis layers 
 (for edition), with relative set for saving paths in its general settings, 
 I successfully use relative paths for svg symbols, but relative paths don’t 
 work when I want to display a photo in a form or when I want to set the path 
 to a photo by navigating to it.  Is this a bug ? A missing feature ? Am I 
 missing something ?
 
 I use QGis 2.10 (Pisa) on Mac OS X 10.10.5 .
 
 Any help is welcome.
 
 Didier
 
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[Qgis-user] relative path in QGis forms

[didier peeters]

Hello,

I was wondering about the possibility to store and use relative paths with the 
Photo widget in QGis forms; I have a project accessing Postgis layers (for 
edition), with relative set for saving paths in its general settings, I 
successfully use relative paths for svg symbols, but relative paths don’t work 
when I want to display a photo in a form or when I want to set the path to a 
photo by navigating to it.  Is this a bug ? A missing feature ? Am I missing 
something ?

I use QGis 2.10 (Pisa) on Mac OS X 10.10.5 .

Any help is welcome.

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[Qgis-user] Saving a polygon in QGis before to edit it

[didier peeters]

Hello,

I would like to find the best solution to the following case:

in QGis, when editing a polygon (splitting it in 2 parts) I need to save the 
original shape, in order to keep the different steps of its evolution; this 
operation is likely to be repeated several times.  The solution I found is to 
start by copying the polygon, 
then edit it (split) 
then pasting back the original one, 
then adjust and update the attributes of the 2 new polygons.  

Is there a less tricky way to achieve this ?  

If not it would be nice to have an option in the save dialog (with a default 
behaviour set in the Settings), and I would file a feature request.  

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Re: [Qgis-user] Saving a polygon in QGis before to edit it

[didier peeters]

Hello Andreas,

yes it’s for some ‘historisation', more precisely to make a filiation, and yes 
I certainly will use triggers in PostGIS.  But I wanted to avoid confusion 
between different kind of edition operations that I’m not currently foreseeing; 
I’m not sure it will always be easy to distinct this specific action from 
others.  And I thought that it might also be interesting outside of the 
database world, to have that edit and preserve operation. 

Didier


 Le 20 juil. 2015 à 09:10, Neumann, Andreas a.neum...@carto.net a écrit :
 
 Hi Didier,
 
 Is this for historisation purposes? If yes, I would look into database 
 solutions to do historization.
 
 The SQL-MM standard has this as a built-in tool set for databases, however, 
 PostgreSQL does not implement this part of the SQL specification (I believe 
 the latest versions of SQL server and Oracle 12 does). However, you can 
 simulate the same in Postgis, using triggers and rules.
 
 Andreas
 
 On 2015-07-20 08:00, didier peeters wrote:
 
 Hello,
  
 I would like to find the best solution to the following case:
  
 in QGis, when editing a polygon (splitting it in 2 parts) I need to save the 
 original shape, in order to keep the different steps of its evolution; this 
 operation is likely to be repeated several times.  The solution I found is 
 to 
 start by copying the polygon, 
 then edit it (split) 
 then pasting back the original one, 
 then adjust and update the attributes of the 2 new polygons.  
  
 Is there a less tricky way to achieve this ?  
  
 If not it would be nice to have an option in the save dialog (with a default 
 behaviour set in the Settings), and I would file a feature request.  
  
 Didier
 
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Re: [Qgis-user] Saving a polygon in QGis before to edit it

[didier peeters]

I’m facing a strange behavior now: I tested the layerVersion plugin, at first 
it seemed to work fine and effectively bring back the previous polygon’s shape. 
 
But then a confusion appeared  between the polygons : when moved one, it would 
‘disappear’ and another would move as well and after saving this only the 
second polygon had moved while the first one would ‘re-appear’ at its original 
place.  When selecting a polygon, 2 more ones are selected as well, and when 
deleting ‘them’ (with the red garbage can, I use QGis 2.8.2) the first one 
disappears only.  This behavior continues after having uninstalled LayerVersion 
and restarted QGis.

Is this a bug generated by LayerVersion ?  Has anybody seen this before ?
My layer is provided by PostGis.


Didier


 Le 20 juil. 2015 à 13:24, Enrico Ferreguti enrico...@gmail.com a écrit :
 
 mmm... sorry, debug infos left in the code
 simply remove line 142 (the last) of file 
 /Users/didier/.qgis2/python/plugins/layerVersion/layerversion.py
 with a text editor and reload the plugin.
 
 Regards.
 Enrico
 
 2015-07-20 13:05 GMT+02:00 Matthias Kuhn matth...@opengis.ch 
 mailto:matth...@opengis.ch:
 Hi,
 
 I remember geogig (formerly geogit) offers promising concepts for filebased 
 spatial data management with historization and branching.
 Unfortunately I don't know the current status of the project and the progress 
 of integration in QGIS.
 
 Matthias
 
 
 On 07/20/2015 11:25 AM, Neumann, Andreas wrote:
 Hi Didier,
 
 I don't think that anyone is working on a client-side historisation option 
 in QGIS. And there wasn't much demand for that in the past, since most 
 serious GIS data resides in databases.
 
 Andreas
 
 On 2015-07-20 09:45, didier peeters wrote:
 
 Hello Andreas,
  
 yes it's for some 'historisation', more precisely to make a filiation, and 
 yes I certainly will use triggers in PostGIS.  But I wanted to avoid 
 confusion between different kind of edition operations that I'm not 
 currently foreseeing; I'm not sure it will always be easy to distinct this 
 specific action from others.  And I thought that it might also be 
 interesting outside of the database world, to have that edit and preserve 
 operation. 
 
 Didier
 
 Le 20 juil. 2015 à 09:10, Neumann, Andreas a.neum...@carto.net 
 mailto:a.neum...@carto.net a écrit :
 Hi Didier,
 
 Is this for historisation purposes? If yes, I would look into database 
 solutions to do historization.
 
 The SQL-MM standard has this as a built-in tool set for databases, however, 
 PostgreSQL does not implement this part of the SQL specification (I believe 
 the latest versions of SQL server and Oracle 12 does). However, you can 
 simulate the same in Postgis, using triggers and rules.
 
 Andreas
 
 On 2015-07-20 08:00, didier peeters wrote:
 
 Hello,
  
 I would like to find the best solution to the following case:
  
 in QGis, when editing a polygon (splitting it in 2 parts) I need to save 
 the original shape, in order to keep the different steps of its evolution; 
 this operation is likely to be repeated several times.  The solution I 
 found is to 
 start by copying the polygon, 
 then edit it (split) 
 then pasting back the original one, 
 then adjust and update the attributes of the 2 new polygons.  
  
 Is there a less tricky way to achieve this ?  
  
 If not it would be nice to have an option in the save dialog (with a 
 default behaviour set in the Settings), and I would file a feature request. 
  
  
 Didier
 
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Re: [Qgis-user] Saving a polygon in QGis before to edit it

[didier peeters]

Enrico,

I will try to see what’s going on and if I find some evidences I will put it in 
the issue tracker.

Didier


 Le 20 juil. 2015 à 16:26, Enrico Ferreguti enrico...@gmail.com a écrit :
 
 It's difficult to realize what happens from your description. The plugin is 
 very simple, it saves all buffer and restores them checking data consistency, 
 so the issues you report makes me think it could happen a featureId mismatch. 
  Perhaps you are trying to restore a version on a already modified layer. Did 
 you get some messages loading version file? Is it the same with non PostGis 
 Layers? 
 The plugin has been marked as experimental because it's not wide tested and I 
 fear it could bring to data losses, so I ask you to contribute reporting the 
 bug to the issue tracker (https://github.com/enricofer/layerVersion/issues 
 https://github.com/enricofer/layerVersion/issues), providing all the 
 informations (operational steps, sample datasets) needed to replicate the 
 issue.
 Thanks.
 
 
 
 2015-07-20 14:39 GMT+02:00 didier peeters dpeet...@ulb.ac.be 
 mailto:dpeet...@ulb.ac.be:
 I’m facing a strange behavior now: I tested the layerVersion plugin, at first 
 it seemed to work fine and effectively bring back the previous polygon’s 
 shape.  
 But then a confusion appeared  between the polygons : when moved one, it 
 would ‘disappear’ and another would move as well and after saving this only 
 the second polygon had moved while the first one would ‘re-appear’ at its 
 original place.  When selecting a polygon, 2 more ones are selected as well, 
 and when deleting ‘them’ (with the red garbage can, I use QGis 2.8.2) the 
 first one disappears only.  This behavior continues after having uninstalled 
 LayerVersion and restarted QGis.
 
 Is this a bug generated by LayerVersion ?  Has anybody seen this before ?
 My layer is provided by PostGis.
 
 
 Didier
 
 
 Le 20 juil. 2015 à 13:24, Enrico Ferreguti enrico...@gmail.com 
 mailto:enrico...@gmail.com a écrit :
 
 mmm... sorry, debug infos left in the code
 simply remove line 142 (the last) of file 
 /Users/didier/.qgis2/python/plugins/layerVersion/layerversion.py
 with a text editor and reload the plugin.
 
 Regards.
 Enrico
 
 2015-07-20 13:05 GMT+02:00 Matthias Kuhn matth...@opengis.ch 
 mailto:matth...@opengis.ch:
 Hi,
 
 I remember geogig (formerly geogit) offers promising concepts for filebased 
 spatial data management with historization and branching.
 Unfortunately I don't know the current status of the project and the 
 progress of integration in QGIS.
 
 Matthias
 
 
 On 07/20/2015 11:25 AM, Neumann, Andreas wrote:
 Hi Didier,
 
 I don't think that anyone is working on a client-side historisation option 
 in QGIS. And there wasn't much demand for that in the past, since most 
 serious GIS data resides in databases.
 
 Andreas
 
 On 2015-07-20 09:45, didier peeters wrote:
 
 Hello Andreas,
  
 yes it's for some 'historisation', more precisely to make a filiation, and 
 yes I certainly will use triggers in PostGIS.  But I wanted to avoid 
 confusion between different kind of edition operations that I'm not 
 currently foreseeing; I'm not sure it will always be easy to distinct this 
 specific action from others.  And I thought that it might also be 
 interesting outside of the database world, to have that edit and 
 preserve operation. 
 
 Didier
 
 Le 20 juil. 2015 à 09:10, Neumann, Andreas a.neum...@carto.net 
 mailto:a.neum...@carto.net a écrit :
 Hi Didier,
 
 Is this for historisation purposes? If yes, I would look into database 
 solutions to do historization.
 
 The SQL-MM standard has this as a built-in tool set for databases, 
 however, PostgreSQL does not implement this part of the SQL specification 
 (I believe the latest versions of SQL server and Oracle 12 does). However, 
 you can simulate the same in Postgis, using triggers and rules.
 
 Andreas
 
 On 2015-07-20 08:00, didier peeters wrote:
 
 Hello,
  
 I would like to find the best solution to the following case:
  
 in QGis, when editing a polygon (splitting it in 2 parts) I need to save 
 the original shape, in order to keep the different steps of its evolution; 
 this operation is likely to be repeated several times.  The solution I 
 found is to 
 start by copying the polygon, 
 then edit it (split) 
 then pasting back the original one, 
 then adjust and update the attributes of the 2 new polygons.  
  
 Is there a less tricky way to achieve this ?  
  
 If not it would be nice to have an option in the save dialog (with a 
 default behaviour set in the Settings), and I would file a feature 
 request.  
  
 Didier
 
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Re: [Qgis-user] Default values in form

[didier peeters]

Hi Andreas,

it would be nice to have these options:

by default the default values precede the last inserted values (otherwise 
defining default values would be somehow useless), except where specified 
otherwise in the field definitions.  So there would be an option in each field 
definition (a checkbox, next to the default value definition field) stating 
that the last non null inserted values do precede the default one.  

Cheers,
Didier


 Le 26 juin 2015 à 14:15, Andreas Neumann a.neum...@carto.net a écrit :
 
 Hi,
 
 When doing anything with default values we also have to think about the 
 option we have which automatically fills in the values of the last inserted 
 record.
 
 Which one has precedence? The default value or the value of the last record?
 
 Also - I think we probably need a mixture of default values and values from 
 the last record - but I think the values of the last record are not 
 fine-grained enough - so we could tell QGIS to use the values from the last 
 record for some columns but for other columns use the default value.
 
 We have to think about both approaches and need a collaboration of both, in 
 my opinion.
 
 Andreas
 
 On 26.06.2015 12:14, didier peeters wrote:
 Thanks,
 
 I’ll surely take a look at your plugin, and open a ticket if necessary.
 
 @Stefan : I had seen that post by Nathan Woodrow, but was hoping for 
 something ‘lighter’ …
 
 Didier
 
 
 Le 26 juin 2015 à 11:32, Bernhard Ströbl bernhard.stro...@jena.de a écrit 
 :
 
 Hi,
 
 if you define the values as default in PostgreSQL and use my :) plugin 
 DataDrivenInputMask [1] these values are inserted in the mask that is 
 created by the plugin in QGIS. Thus for fields with defaults you cannot 
 insert NULL vallues (but that's why you define a default).
 
 Bernhard
 
 http://plugins.qgis.org/plugins/DataDrivenInputMask/
 
 Am 26.06.2015 um 10:08 schrieb didier peeters:
 Hello,
 
 Simple question : is there a way to set a default value for an attribute 
 in QGis ?
 
 I have Postgis layers in QGis in which I’m inserting or updating data, and 
 I would like that some fields would be filled automatically unless I fill 
 them myself.  Well that’s the definition of a default value, and I don’t 
 think that using layers stored in Postgis would make any difference.
 
 Thanks
 Didier
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Re: [Qgis-user] Default values in form

[didier peeters]

Hi Matthias,

In a previous e-mail you said that you would prefer to have a global redesign 
of the field definition and form tab(s) ; should I create this specific feature 
request anyway or wouldn’t fit into your QEP instead ? And by the way, I’m not 
sure about how to add comments to your QEP, I’m not familiar with this tool.  

Cheers,
Didier

 Le 26 juin 2015 à 16:26, Matthias Kuhn matthias.k...@gmx.ch a écrit :
 
 Hi Didier
 
 On 06/26/2015 12:36 PM, didier peeters wrote:
 Hello Mathias,
 
 this would be great ! 
 Additionally, this makes me think of another possible enhancement: when 
 displaying a picture in a form tab, it could be nice to hide the label and 
 path/url to the file, which is most of the time useless.  Do I need to do 
 anything more to make these suggestions ?
 That can easily be added as a feature request.
 
 Cheers
 Matthias

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[Qgis-user] Default values in form

[didier peeters]

Hello,

Simple question : is there a way to set a default value for an attribute in 
QGis ?  

I have Postgis layers in QGis in which I’m inserting or updating data, and I 
would like that some fields would be filled automatically unless I fill them 
myself.  Well that’s the definition of a default value, and I don’t think that 
using layers stored in Postgis would make any difference.

Thanks
Didier
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Re: [Qgis-user] Default values in form

[didier peeters]

Thanks,

I’ll surely take a look at your plugin, and open a ticket if necessary.  

@Stefan : I had seen that post by Nathan Woodrow, but was hoping for something 
‘lighter’ …

Didier


 Le 26 juin 2015 à 11:32, Bernhard Ströbl bernhard.stro...@jena.de a écrit :
 
 Hi,
 
 if you define the values as default in PostgreSQL and use my :) plugin 
 DataDrivenInputMask [1] these values are inserted in the mask that is created 
 by the plugin in QGIS. Thus for fields with defaults you cannot insert NULL 
 vallues (but that's why you define a default).
 
 Bernhard
 
 http://plugins.qgis.org/plugins/DataDrivenInputMask/
 
 Am 26.06.2015 um 10:08 schrieb didier peeters:
 Hello,
 
 Simple question : is there a way to set a default value for an attribute in 
 QGis ?
 
 I have Postgis layers in QGis in which I’m inserting or updating data, and I 
 would like that some fields would be filled automatically unless I fill them 
 myself.  Well that’s the definition of a default value, and I don’t think 
 that using layers stored in Postgis would make any difference.
 
 Thanks
 Didier
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Didier Peeters
Institut de Gestion de l'Environnement et d'Aménagement du Territoire (IGEAT) 
Université Libre de Bruxelles (ULB)
CP130/03 
av. F. D. Roosevelt 50
B-1050 Bruxelles   

Tél : +32-2-650 68 17



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Re: [Qgis-user] Default values in form

[didier peeters]

Hello Mathias,

this would be great ! 
Additionally, this makes me think of another possible enhancement: when 
displaying a picture in a form tab, it could be nice to hide the label and 
path/url to the file, which is most of the time useless.  Do I need to do 
anything more to make these suggestions ?

Didier




 Le 26 juin 2015 à 12:07, Matthias Kuhn matthias.k...@gmx.ch a écrit :
 
 I think this would fit into the area of this QEP:
 
 https://github.com/m-kuhn/QGIS-Enhancement-Proposals/blob/fields-and-forms-redesign/QEP-Fields-and-forms-redesign.rst#31-fields
  
 https://github.com/m-kuhn/QGIS-Enhancement-Proposals/blob/fields-and-forms-redesign/QEP-Fields-and-forms-redesign.rst#31-fields
 
 It could be added to the list Information about fields next to 
 constraints.
 
 Any feedback on it is welcome.
 
 Matthias
 
 On 06/26/2015 11:35 AM, Paolo Cavallini wrote:
 Agreed, an important improvement. Please open a ticket if not already there.
 All the best.
 
 Il 26 giugno 2015 08:16:32 GMT+00:00, Blumentrath, Stefan 
 stefan.blumentr...@nina.no mailto:stefan.blumentr...@nina.no ha scritto:
 Hei Didier,
 
 I guess you could use a python init function for the form in order to define 
 default values (see: 
 http://nathanw.net/2011/09/05/qgis-tips-custom-feature-forms-with-python-logic
  
 http://nathanw.net/2011/09/05/qgis-tips-custom-feature-forms-with-python-logic/).
 However, sounds like a useful enhancement of the Custom form functionality 
 (at least I would be interested too)...
 
 Cheers
 Stefan
 
 -Original Message-
 From: qgis-user-boun...@lists.osgeo.org 
 mailto:qgis-user-boun...@lists.osgeo.org 
 [mailto:qgis-user-boun...@lists.osgeo.org 
 mailto:qgis-user-boun...@lists.osgeo.org] On Behalf Of didier peeters
 Sent: 26. juni 2015 10:08
 To: qgis-user
 Subject: [Qgis-user] Default values in form
 
 Hello,
 
 Simple question : is there a way to set a default value for an attribute in 
 QGis ?  
 
 I have Postgis layers in QGis in which I’m inserting or updating data, and I 
 would like that some fields would be filled automatically unless I fill
 them myself.  Well that’s the definition of a default value, and I don’t 
 think that using layers stored in Postgis would make any difference.
 
 Thanks
 Didier
 
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