Re: [Qgis-user] Toggle Attribute

[Bernd Vogelgesang]

I had a similiar use case, see here:
https://gis.stackexchange.com/q/322544/8202

Unfortunately, I just noticed the answer on my post then right now, so I
did not dig any deeper.

Basic thing is, that you can establish a "connection" between two layers
by an "aggregate" function.

But how to use that to change the style on e.g. a hover, is still beyond
my capabilities, but I'm prettey sure there  is some clever way to
accomplish that. Sadly, I'm not that clever. Maybe something with rule
based style?

Cheers,

Bernd

On 21.11.20 11:51, L.W. wrote:

Hi,

is there a way to have a feature on map and when I press/click/hover on
it that some event is raised?

Primary I want to toggle an attribute field true/false.

I than will e.g. display a special symbol(layer) to an other feature.

Example: Feature A has a foreign key to Feaure B, when B is hovered then
A's symbol should be yellow instead of green.

Regards

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Re: [Qgis-user] Toggle Attribute

[Thayer Young]

 Look into actions:
https://docs.qgis.org/3.16/en/docs/user_manual/working_with_vector/vector_properties.html#actions-propertieshttps://gis.stackexchange.com/questions/tagged/actions


--Message: 1
Date: Sat, 21 Nov 2020 11:51:50 +0100
From: "L.W." 
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] Toggle Attribute
Message-ID: 
Content-Type: text/plain; charset=utf-8; format=flowed

Hi,

is there a way to have a feature on map and when I press/click/hover on
it that some event is raised?

Primary I want to toggle an attribute field true/false.

I than will e.g. display a special symbol(layer) to an other feature.

Example: Feature A has a foreign key to Feaure B, when B is hovered then
A's symbol should be yellow instead of green.

Regards





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Re: [Qgis-user] Download error of Sentinel 2 in SCP Plugin

[Mauricio Tecles]

  
No problemhere. I’ve tried with SCP 6 and the latest SCP 7.0.15, successfully 
(QGIS3.10.10, Sentinel 2). Try to update your SCP plugin.
Mauricio

Em quinta-feira, 19 de novembro de 2020 15:52:59 BRT, Vanildo Heleno 
Pereira  escreveu:  
 
 Hello everyone,Has anyone had this error in QGIS 3?"Error [50]: Internet 
error: HTTP error 401: Unauthorized"I can't download the Sentinel images 
through the plugin.But I can log in normally on the copernicus web page.I am 
using QGIS 3.10 and the Semi-Automatic Classification Plugin (Release 7.0.9.1).
Regards.
Vanildo Pereira
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Re: [Qgis-user] Vote for Lat Lon Tools Default Coordinate Order - YX or XY

[C Hamilton]

I appreciate everyone's ideas and opinions. I think that for now I will
leave Lat Lon Tools as it currently operates, but I will look over the
suggestions to see if I can make sure the options are as clear as possible.

Thanks once again for your input.

Calvin


On Sat, Nov 21, 2020 at 3:52 AM Richard Duivenvoorde 
wrote:

> On 11/20/20 6:10 PM, C Hamilton wrote:
> > It was suggested to me that the default coordinate order in the Lat Lon
> Tools plugin for coordinate capture and zoom-to tools should be "longitude,
> latitude" or "X, Y". Originally, Lat Lon Tools was designed to work with
> on-line maps which are generally "latitude, longitude" order.
> >
> > You can always go into the plugin settings and specify which order you
> want and that order will be preserved everytime you launch QGIS. The
> default order is only applicable the first time you install "Lat Lon Tools"
> or if you do a reset to defaults in the Lat Lon Tools settings menu,
> >
> > Who prefers Lat Lon Tools to default to "longitude, latitude" or "X, Y"
> when the plugin is first installed or reset to default values?
> >
> > Who prefers Lat Lon Tools to default to "latitude, longitude (Google map
> order)" or "Y, X" when the plugin is first installed or reset to default
> values?
>
> I'm a little late on the table :-) As descision already cast:
>
> https://github.com/NationalSecurityAgency/qgis-latlontools-plugin/issues/53#issuecomment-731070055
> and fine with it, just want to add:
>
> I'm not a geo-guy by original trade and working with scientists/911 peeps
> at the moment, who favour the math-way of exchanching coordinates (2
> dimensional values): X,Y.
>
> If I were 'boss geo', I'd never use lonlat or latlon terms, only use
> (decimal!) degrees or x,y :-)
> (people tend to mix lat lon up all the time, they never do with x,y).
>
> In my use-case, the Lat Lon Tools plugin is used in a very pluriform,
> international environment where coordinates from all kind of crs's are to
> be mixed/converted (often one pair at a time...). Why would you use YX in
> one crs and XY in other crs's? It's just not very efficient to have that
> choice. Just like meters/feet, point/comma delimeters in numbers etc etc.
> This screams for conversion issues ...
>
> Ah, and while on it, let's all speak Esparanto (and keep the number of
> QGIS translation builds low) ;-)
>
> Korajn salutojn,
>
> Richard Duivenvoorde
>
>
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Re: [Qgis-user] Vote for Lat Lon Tools Default Coordinate Order - YX or XY

[Mike Flannigan]

It's already a switchable option.  The question is,
what is the default if you don't select an option.


Mike


On 11/21/20 1:52 AM, qgis-user-requ...@lists.osgeo.org wrote:

How about just make it a switchable option?? I think GMT battled this
unresolvable subjectivity eons ago.
J.



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Re: [Qgis-user] Vote for Lat Lon Tools Default Coordinate Order - YX or XY

[Christoph Jung]

Hi,

My personal opinion is, that GIS should think more in a mathematic way. Because 
of that, I always prefer working with XY-values, no matter which CRS I am 
using. It is always a mess for your work, if data using YX-values, and you will 
analyse your data with mathematic formulas. The usage of lat Lon is only a 
speaking and survey thing...

Sincerely,
Christoph 

> Am 20.11.2020 um 18:11 schrieb C Hamilton :
> 
> 
> It was suggested to me that the default coordinate order in the Lat Lon Tools 
> plugin for coordinate capture and zoom-to tools should be "longitude, 
> latitude" or "X, Y". Originally, Lat Lon Tools was designed to work with 
> on-line maps which are generally "latitude, longitude" order.
> 
> You can always go into the plugin settings and specify which order you want 
> and that order will be preserved everytime you launch QGIS. The default order 
> is only applicable the first time you install "Lat Lon Tools" or if you do a 
> reset to defaults in the Lat Lon Tools settings menu,
> 
> Who prefers Lat Lon Tools to default to "longitude, latitude" or "X, Y" when 
> the plugin is first installed or reset to default values?
> 
> Who prefers Lat Lon Tools to default to "latitude, longitude (Google map 
> order)" or "Y, X" when the plugin is first installed or reset to default 
> values?
> 
> I'm just checking to see if I should make this change or not.
> 
> Thanks,
> 
> Calvin
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[Qgis-user] Toggle Attribute

[L.W.]

Hi,

is there a way to have a feature on map and when I press/click/hover on
it that some event is raised?

Primary I want to toggle an attribute field true/false.

I than will e.g. display a special symbol(layer) to an other feature.

Example: Feature A has a foreign key to Feaure B, when B is hovered then
A's symbol should be yellow instead of green.

Regards

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Re: [Qgis-user] Dynamic Line

[L.W.]

Hi,

I do not know why exactly, but now it is working.

thanks to everyone who helped!

regards


Am 14.11.2020 um 21:50 schrieb Nicolas Cadieux:


Start by joining both files using a common field (right click
property/joins).

This could give you a file that looks like this:

fid,x1,y1,x2,y2
1,0,0,1,1
2,10,10,100,100
...

Save this file as geopackage (line).  This way, you can modify it.

x1,y1 are from the first file and x2,y2 are from the second file.
These coordinates can be generated by creating a new field and
updating it with $x or $y functions in the field calculator.

Then, using the field calculator, select "modify and existing field"
and select .  Update this field using the following line.

geom_from_wkt('LINESTRING(' ||  "x1"  || ' ' ||  "y1"  || ',' || 
"x2"  || ' ' ||  "y2"  || ')')

This will create the lines.

Nicolas

On 2020-11-14 7:53 a.m., L.W. wrote:


I tried a lot ...

I have a point-layer, I put this code in symbol -> single symbol ->
geometrygenerator

What is wrong?


geom_to_wkt
(
    make_line
    (
        make_point
        (
            5826542.703128459,
            797907.3304607988
        ),
        make_point
        (
            5827473.536854242,
            796987.0074038045
        ),
        make_point
        (
            5827167.893279332,
            795128.2317764781
        ),
        make_point
        (
            5826835.7783904355,
            793227.8583700341
        )
    )
)

Am 13.11.2020 um 15:24 schrieb Andreas Neumann:


Hi Nicolas,

Yes - but that doesn't magically turn a "non geometry" table into a
"geometry table" - as far as I know. So you probably need to create
a "Virtual Layer" and create the geometry similar to what you propose.

Andreas

Am 13.11.20 um 15:22 schrieb Nicolas Cadieux:

Hi,
You can create a geometry from WKT if you have x and y fields using
and expression in the field calculator.
|geom_from_wkt('POINT('||"x"||' '||"y"||')')|

https://en.wikipedia.org/wiki/Well-known_text_representation_of_geometry


Nicolas Cadieux


Le 13 nov. 2020 à 09:07, Andreas Neumann  a
écrit :



Hi

Neither GeometryGenerators nor Vector Field Markers work on tables
without geometry, unfortunately. You didn't inform us, that you
don't have geometry in your table.

You can, however, create a "Virtual Layer" and write some SQL to
create a geometry from your attributes: menu "Layer" --> "Create
Layer" --> "New Virtual Layer" - where you can use your existing
tables and create a new geometry column with SQL. See
https://docs.qgis.org/testing/en/docs/user_manual/managing_data_source/create_layers.html#creating-virtual-layers

Or, if your table is a CSV file, then you can assign attribute
columns to a point geometry and then just hide the point rendering
if you don't need it.

This is an unfortunate limitation of QGIS, that there is no "easy"
way to add a geometry column to table that doesn't have geometry
(or if it is possible, then I don't know it).

Hope this helps you,

Andreas

Am 13.11.20 um 14:52 schrieb L.W.:


Does it works on Layers with no geometry?

My layers do not have a geometry.


Am 13.11.2020 um 11:56 schrieb Andreas Neumann:


Yes, you need point data to start from, but then vectors can
bei/are generated from the attributes you mentioned.

Andreas

Am 13.11.20 um 11:47 schrieb L.W.:


from the docs ...

It can only be used to render point data


12.2.2.2.6.The Vector Field Marker



The vector field marker is used to display vector field data
such as earth deformation, tidal flows, and the like. It
displays the vectors as lines (preferably arrows) that are
scaled and oriented according to selected attributes of data
points. It can only be used to render point data; line
and polygon layers are not drawn by this symbology.

The vector field is defined by attributes in the data, which
can represent the field either by:

 *

*cartesian*components (|x|and|y|components of the field)

 *

or*polar*coordinates: in this case, attributes
define|Length|and|Angle|. The angle may be measured either
clockwise from north, or Counterclockwise from east, and
may be either in degrees or radians.

 *

or as*height only*data, which displays a vertical arrow
scaled using an attribute of the data. This is appropriate
for displaying the vertical component of deformation, for
example.

The magnitude of field


Am 13.11.2020 um 11:34 schrieb Andreas Neumann:

Or even easier: use the "Vector Field Marker":

https://docs.qgis.org/3.10/en/docs/user_manual/style_library/symbol_selector.html?#the-vector-field-marker


Am 13.11.20 um 11:33 schrieb Andreas Neumann:

Hi,

Yes - you can use Geometry Generators for that. Use the
make_point() and make_line() expressions for that.

See

Re: [Qgis-user] Vote for Lat Lon Tools Default Coordinate Order - YX or XY

[Richard Duivenvoorde]

On 11/20/20 6:10 PM, C Hamilton wrote:
> It was suggested to me that the default coordinate order in the Lat Lon Tools 
> plugin for coordinate capture and zoom-to tools should be "longitude, 
> latitude" or "X, Y". Originally, Lat Lon Tools was designed to work with 
> on-line maps which are generally "latitude, longitude" order.
> 
> You can always go into the plugin settings and specify which order you want 
> and that order will be preserved everytime you launch QGIS. The default order 
> is only applicable the first time you install "Lat Lon Tools" or if you do a 
> reset to defaults in the Lat Lon Tools settings menu,
> 
> Who prefers Lat Lon Tools to default to "longitude, latitude" or "X, Y" when 
> the plugin is first installed or reset to default values?
> 
> Who prefers Lat Lon Tools to default to "latitude, longitude (Google map 
> order)" or "Y, X" when the plugin is first installed or reset to default 
> values?

I'm a little late on the table :-) As descision already cast: 
https://github.com/NationalSecurityAgency/qgis-latlontools-plugin/issues/53#issuecomment-731070055
and fine with it, just want to add:

I'm not a geo-guy by original trade and working with scientists/911 peeps at 
the moment, who favour the math-way of exchanching coordinates (2 dimensional 
values): X,Y. 

If I were 'boss geo', I'd never use lonlat or latlon terms, only use (decimal!) 
degrees or x,y :-) 
(people tend to mix lat lon up all the time, they never do with x,y).

In my use-case, the Lat Lon Tools plugin is used in a very pluriform, 
international environment where coordinates from all kind of crs's are to be 
mixed/converted (often one pair at a time...). Why would you use YX in one crs 
and XY in other crs's? It's just not very efficient to have that choice. Just 
like meters/feet, point/comma delimeters in numbers etc etc. This screams for 
conversion issues ...

Ah, and while on it, let's all speak Esparanto (and keep the number of QGIS 
translation builds low) ;-)

Korajn salutojn,

Richard Duivenvoorde

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Re: [Qgis-user] Vote for Lat Lon Tools Default Coordinate Order -, YX or XY

[Priv. Doz. Dr. Maria Shinoto]

Hi, 

the tool is great, thank you so much -- and I can live with the settings as 
they are. 

Maria

> Am 21.11.2020 um 08:44 schrieb Mike Flannigan :
> 
> 
> I too like lat,long, but I can live with anything that is done.
> I'll just set it to lat,long.
> 
> I understand the thinking to change it to X,Y.  Many people
> in the field would agree that is better.  I'm just not one of them.
> 
> I use this tool constantly.  Thank you.
> 
> 
> Mike
> 
> 
> On 11/20/20 2:00 PM, qgis-user-requ...@lists.osgeo.org wrote:
>> It was suggested to me that the default coordinate order in the Lat Lon
>> Tools plugin for coordinate capture and zoom-to tools should be "longitude,
>> latitude" or "X, Y". Originally, Lat Lon Tools was designed to work with
>> on-line maps which are generally "latitude, longitude" order.
>> 
>> You can always go into the plugin settings and specify which order you want
>> and that order will be preserved everytime you launch QGIS. The default
>> order is only applicable the first time you install "Lat Lon Tools" or if
>> you do a reset to defaults in the Lat Lon Tools settings menu,
>> 
>> Who prefers Lat Lon Tools to default to "longitude, latitude" or "X, Y"
>> when the plugin is first installed or reset to default values?
>> 
>> Who prefers Lat Lon Tools to default to "latitude, longitude (Google map
>> order)" or "Y, X" when the plugin is first installed or reset to default
>> values?
>> 
>> I'm just checking to see if I should make this change or not.
>> 
>> Thanks,
>> 
>> Calvin
> 
> 
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Re: [Qgis-user] 202021-ESRI gdb not opening on macOS Big Sur Version 11.0.1

[Ujaval Gandhi]

Ah got it. I am still on Catalina so drag-and-drop works, but get an error
when opening via Data Source Manager.
[image: Logo] 
Ujaval Gandhi
Spatial Thoughts
mobile: +91-8095684687
email: uja...@spatialthoughts.com
[image: LinkedIn icon]   [image:
Twitter icon] 



On Sat, Nov 21, 2020 at 1:33 PM Paul T A Drea  wrote:

> Hi Ujaval,
>
> Same error. I am hearing from a colleage that this macOS version is
> missing some of the lbraries that were in Catalina.
>
> I am updating all my backups and will bite the bullet and roll back to
> Catalina.
>
> Thanks for the quick response.
>
> BR
>
> Paul
> On 21/11/2020 11:52, Ujaval Gandhi wrote:
>
> I just ran into this and looks like a bug. Apparently dragging and
> dropping layers from the Browser panel works perfectly. Do try and see if
> that's the case.
> [image: Logo] 
> Ujaval Gandhi
> Spatial Thoughts
> mobile: +91-8095684687
> email: uja...@spatialthoughts.com
> [image: LinkedIn icon]   [image:
> Twitter icon] 
>
>
>
>
> On Sat, Nov 21, 2020 at 12:27 PM Paul T A Drea  wrote:
>
>> Dear list,
>>
>> I am running QGIS 3.16.0-Hannover QGIS code revision 4af1cbfb97 on a
>> macOS Big Sur platform.
>>
>> Below is the error message I get when I try to open an ESRI gdb file.
>>
>> 2020-11-21T10:36:46 CRITICALInvalid Data Source : /Volumes/PAUL
>> SSD
>> 3/_Verif-i_UAE_2019/04.Data/02.GIS/03.Shapefiles/5.BLOCK_7_NORTH/Facilities_OnshoreBlock7.gdb
>> is not a valid or recognized data source.
>>
>> This same file opens on my Ubuntu 20.04 machine and Win10 machine running
>> QGIS 3.14.1-Pi QGIS code version de08d6b71d with no problems.
>>
>> This has only become apparent after an update on macOS from Catalina
>> v10.15 to Big Sur 11.0.1
>>
>> Has anyone else experienced this problem?
>>
>> Any help in solving this would be much appreciated.
>>
>> Thank you and BR.
>>
>> Paul
>> --
>>
>> *Paul T. A. Drea*
>>
>> *Geodetic Consultant*
>>
>> *Cell Greece: +30-698 052 0611*
>>
>> *Cell Abu Dhabi: +971 50 595 6547*
>>
>> *Cell U.K.: +44 7507 975162*
>>
>> *SKYPE: paul.drea*
>>
>> *e**-mail 1: **pauld...@gmail.com* 
>>
>> *e**-mail 2: **ptad...@otenet.gr* 
>>
>>
>> ___
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>>
> --
>
> *Paul T. A. Drea*
>
> *Geodetic Consultant*
>
> *Cell Greece: +30-698 052 0611*
>
> *Cell Abu Dhabi: +971 50 595 6547*
>
> *Cell U.K.: +44 7507 975162*
>
> *SKYPE: paul.drea*
>
> *e**-mail 1: **pauld...@gmail.com* 
>
> *e**-mail 2: **ptad...@otenet.gr* 
>
>
>
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Re: [Qgis-user] 202021-ESRI gdb not opening on macOS Big Sur Version 11.0.1

[Paul T A Drea]

Hi Ujaval,

Same error. I am hearing from a colleage that this macOS version is 
missing some of the lbraries that were in Catalina.


I am updating all my backups and will bite the bullet and roll back to 
Catalina.


Thanks for the quick response.

BR

Paul

On 21/11/2020 11:52, Ujaval Gandhi wrote:
I just ran into this and looks like a bug. Apparently dragging and 
dropping layers from the Browser panel works perfectly. Do try and see 
if that's the case.

Logo    
Ujaval Gandhi
Spatial Thoughts
mobile: +91-8095684687
email: uja...@spatialthoughts.com 
LinkedIn icon  Twitter 
icon 






On Sat, Nov 21, 2020 at 12:27 PM Paul T A Drea > wrote:


Dear list,

I am running QGIS 3.16.0-Hannover QGIS code revision 4af1cbfb97 on
a macOS Big Sur platform.

Below is the error message I get when I try to open an ESRI gdb file.

2020-11-21T10:36:46 CRITICAL Invalid Data Source : /Volumes/PAUL
SSD

3/_Verif-i_UAE_2019/04.Data/02.GIS/03.Shapefiles/5.BLOCK_7_NORTH/Facilities_OnshoreBlock7.gdb
is not a valid or recognized data source.

This same file opens on my Ubuntu 20.04 machine and Win10 machine
running QGIS 3.14.1-Pi QGIS code version de08d6b71d with no problems.

This has only become apparent after an update on macOS from
Catalina v10.15 to Big Sur 11.0.1

Has anyone else experienced this problem?

Any help in solving this would be much appreciated.

Thank you and BR.

Paul

-- 


*/Paul T. A. Drea/*

*Geodetic Consultant*

*Cell Greece: +30-698 052 0611*

*Cell Abu Dhabi: +971 50 595 6547*

*Cell U.K.: +44 7507 975162*

*SKYPE: paul.drea*

*e**-mail 1: **pauld...@gmail.com* 

*e**-mail 2: **ptad...@otenet.gr* 

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--

*/Paul T. A. Drea/*

*Geodetic Consultant*

*Cell Greece: +30-698 052 0611*

*Cell Abu Dhabi: +971 50 595 6547*

*Cell U.K.: +44 7507 975162*

*SKYPE: paul.drea*

*e**-mail 1: **pauld...@gmail.com* 

*e**-mail 2: **ptad...@otenet.gr* 

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