Re: [Qgis-user] Reduce the file size of the shape file

[Nicolas Cadieux]

Hi,

If you have made a shortest path analysis like a one to all or an all to all, 
then multiple paths will be created.  Select and object then look at the 
attribute table. Sort them to the top. There is a sorting icon for this.  You 
will see that you probably have multiple overlapping path selected. Send a 
screen shot or the file and I can take a look at it tomorrow morning. I am in 
Montreal time.

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 29 juin 2021 à 20:26, krishna Ayyala  a écrit :
> 
> 
> Nicolas,
> Thanks for your reply. Changing the field format and saving to a different 
> file format did not work for me. Just now, I noticed that, Whenever I select 
> one line feature for the "ShortestPath" shapefile, I see the following 
> message at the bottom left corner of the window. For example: "2148 
> feature(s) selected on layer shortest path. i.e. More than one features 
> appear at the bottom left corner for each line that I select. I am trying to 
> figure out how this will appear as 1 feature instead of 2148 features.The 
> tools such as simplify and dissolve did not work for me.
> 
> Regards.
> 
>> On Tue, Jun 29, 2021 at 4:43 PM Nicolas Cadieux 
>>  wrote:
>> Hi,
>> 
>> To my knowledge no.  You could simplify the geometries but that would 
>> probably come with a resolution penalty (missing nodes).  You could perhaps 
>> change the field data type.  For example, an int data type will probably use 
>> less space than a float with a 16 decimal value.  A text field can be 
>> reduced to the minimum size needed.  You can also try to save the file under 
>> an other name.  Depending on where the file was created and used, saving the 
>> file could “permanently delete” some previous deleted components.  Can you 
>> use another file format?
>> 
>> Nicolas Cadieux
>> https://gitlab.com/njacadieux
>> 
 Le 29 juin 2021 à 15:53, krishna Ayyala  a écrit :
 
>>> 
>>> Hello,
>>> I have a "Streets" shape file of a state with about 12000 lines. For the 
>>> same geographic area I have "Blocks_Centroids" shape file of about 6000 
>>> points. I ran the tool as shown below. It resulted in a shapefile 
>>> "ShortestPath" with 6000 lines. The size of the "Streets" shape file with 
>>> 12000 lines is 5000 KB. Whereas the size of the output shape file  
>>> "ShortestPath" with only 6000 lines is 270,000 KB. Is there a way to reduce 
>>> the file size? The reason is I need to upload this in a different platform 
>>> which cannot accept shapefiles larger than 10,000 KB.
>>> 
>>> 
>>> 
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Re: [Qgis-user] replace '\' problem

[David Strip]

  
  
On 6/29/2021 5:28 PM, Marcos wrote:

  
  I was trying to replace the '\' using the replace () function, but it didn´t work
anyway.
It's
  probably a standard/default problem or a 'reserved (not a)
  word'.


  

Just a guess, but \ is commonly used to indicate special characters.
eg, \n = newline.
Try using \\
  

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Re: [Qgis-user] How to convert multiple features to single Feature - Shape file

[chris hermansen]

Krishna and list,

On Tue, Jun 29, 2021, 19:07 krishna Ayyala  wrote:

> I have a line shapefile named "ShortestPath.shp". Whenever I select one
> line feature for the "ShortestPath" shapefile, I see the following message
> at the bottom left corner of the window. For example: "9 feature(s)
> selected on layer shortest path. i.e. More than one features appear at the
> bottom left corner for each line that I select.
>

Sounds like you have a number of semi overlapping linestrings, like this:

--
  --
 


I haven't used the particular tool you mention, but I could guess that it
might generate output like that, especially if you generated all the
shortest paths from all the origins to all the destinations in the same
shapefile.

It may be worth trying one origin and one destination to see what the
result of that is (separate shapefile). Then identify a similar linestrings
group in the problematic file to see if you can find the same single route
mixed in there.

>
>  Is there a way, whenever I select one line feature, It should appear as
> one line feature at the bottom left corner. The tools such as simplify and
> dissolve did not work for me.
>

I think you need to do something like creating the intersections of all the
overlapping linestrings. I would think that each intersection would contain
all the to-from ids.

I hope this helps!
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[Qgis-user] How to convert multiple features to single Feature - Shape file

[krishna Ayyala]

I have a line shapefile named "ShortestPath.shp". Whenever I select one
line feature for the "ShortestPath" shapefile, I see the following message
at the bottom left corner of the window. For example: "9 feature(s)
selected on layer shortest path. i.e. More than one features appear at the
bottom left corner for each line that I select.

 Is there a way, whenever I select one line feature, It should appear as
one line feature at the bottom left corner. The tools such as simplify and
dissolve did not work for me.
Regards.
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Re: [Qgis-user] Reduce the file size of the shape file

[krishna Ayyala]

Nicolas,
Thanks for your reply. Changing the field format and saving to a different
file format did not work for me. Just now, I noticed that, Whenever I
select one line feature for the "ShortestPath" shapefile, I see the
following message at the bottom left corner of the window. For example:
"2148 feature(s) selected on layer shortest path. i.e. More than one
features appear at the bottom left corner for each line that I select. I am
trying to figure out how this will appear as 1 feature instead of 2148
features.The tools such as simplify and dissolve did not work for me.

Regards.

On Tue, Jun 29, 2021 at 4:43 PM Nicolas Cadieux 
wrote:

> Hi,
>
> To my knowledge no.  You could simplify the geometries but that would
> probably come with a resolution penalty (missing nodes).  You could perhaps
> change the field data type.  For example, an int data type will probably
> use less space than a float with a 16 decimal value.  A text field can be
> reduced to the minimum size needed.  You can also try to save the file
> under an other name.  Depending on where the file was created and used,
> saving the file could “permanently delete” some previous deleted
> components.  Can you use another file format?
>
> Nicolas Cadieux
> https://gitlab.com/njacadieux
>
> Le 29 juin 2021 à 15:53, krishna Ayyala  a
> écrit :
>
> 
> Hello,
> I have a "Streets" shape file of a state with about 12000 lines. For the
> same geographic area I have "Blocks_Centroids" shape file of about 6000
> points. I ran the tool as shown below. It resulted in a shapefile
> "ShortestPath" with 6000 lines. The size of the "Streets" shape file with
> 12000 lines is 5000 KB. Whereas the size of the output shape file
> "ShortestPath" with only 6000 lines is 270,000 KB. Is there a way to reduce
> the file size? The reason is I need to upload this in a different platform
> which cannot accept shapefiles larger than 10,000 KB.
>
> 
>
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>
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[Qgis-user] replace '\' problem

[Marcos]

Hello everyone,

I was trying to replace the '\' using the *replace () *function, but it
didn´t work anyway.
It's probably a standard/default problem or a 'reserved (not a) word'.

Can someone please help me to understand why this happened?

Thanks in advance,

-- 
Marcos Eichemberger Ummus
Tel.: +55 (11) 9-4860-8441
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Re: [Qgis-user] plugin integration/interaction with layout window?

[Patrick Dunford]

Thankyou for your reply

I suppose there are potentially many solutions I could look at for my 
particular situation, one of those might be writing my own private 
plugin which will give me the capability to get a toolbar button from 
which it can then call my script if the script code is copied into the 
plugin.


Questions are mostly along the lines

- are there any differences in the way a script interacts with a running 
application when the script is incorporated into a plugin


- can a custom toolbar or button be added in the Layout window (using 
the code example shown for ch16 of the pyqgis cookbook)


- can a script or plugin place a message in the message bar of a Layout 
window instead of the main application window


On 29/06/21 7:26 pm, Luigi Pirelli wrote:

Hi Patrick

seems more a question for the developer list where many UX involved 
people can give you opinions.


Luigi Pirelli

**
* LinkedIn: https://www.linkedin.com/in/luigipirelli 

* Stackexchange: 
http://gis.stackexchange.com/users/19667/luigi-pirelli 


* GitHub: https://github.com/luipir 
* Book: Mastering QGIS3 - 3rd Edition 


* Hire a team: http://www.qcooperative.net 
**


On Tue, 29 Jun 2021 at 05:48, Patrick Dunford > wrote:


Just have a question here about the use of separate application
windows
for the Qgis application main window and the Layout window. Obviously
the separate layout windows can be multiple in number whereas most of
the time we only need one application main window open.

However for me there is the question of having different toolbars and
panels available in the two different types of window. Whilst they do
fulfill different functions of the application, the crossover between
those functions that is easy to achieve when running a script
somewhat
blurs the merits of separate windows and raises the question of why
panels and toolbars can only be used in one or the other windows
but not
both.

In other words should you have the two distinct types of window or
one
window that can have a combination of panels and toolbars from
anywhere.
Granted that that would be a challenge if implemented to its fullest
extent since most of the panels and toolbars are specific to each
window
type and the canvas would have to become some sort of panel as well.

My view on this is mostly driven by the apparently reasonable
conclusion
that the Python scripting console panel should not be limited to only
being able to be docked to the application main window instead of the
layout window as is currently the case. I have a script that
performs a
layout export to image and I have to keep switching backwards and
forwards between the main window and the layout window to run the
script, which can be for hundreds of export operations in a day. The
script itself reduces the number of mouse clicks needed to run
each of
the individual exports by automatically selecting the layers to
make up
an export in the main window.

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Re: [Qgis-user] Reduce the file size of the shape file

[Nicolas Cadieux]

Hi,

To my knowledge no.  You could simplify the geometries but that would probably 
come with a resolution penalty (missing nodes).  You could perhaps change the 
field data type.  For example, an int data type will probably use less space 
than a float with a 16 decimal value.  A text field can be reduced to the 
minimum size needed.  You can also try to save the file under an other name.  
Depending on where the file was created and used, saving the file could 
“permanently delete” some previous deleted components.  Can you use another 
file format?

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 29 juin 2021 à 15:53, krishna Ayyala  a écrit :
> 
> 
> Hello,
> I have a "Streets" shape file of a state with about 12000 lines. For the same 
> geographic area I have "Blocks_Centroids" shape file of about 6000 points. I 
> ran the tool as shown below. It resulted in a shapefile "ShortestPath" with 
> 6000 lines. The size of the "Streets" shape file with 12000 lines is 5000 KB. 
> Whereas the size of the output shape file  "ShortestPath" with only 6000 
> lines is 270,000 KB. Is there a way to reduce the file size? The reason is I 
> need to upload this in a different platform which cannot accept shapefiles 
> larger than 10,000 KB.
> 
> 
> 
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[Qgis-user] Reduce the file size of the shape file

[krishna Ayyala]

Hello,
I have a "Streets" shape file of a state with about 12000 lines. For the
same geographic area I have "Blocks_Centroids" shape file of about 6000
points. I ran the tool as shown below. It resulted in a shapefile
"ShortestPath" with 6000 lines. The size of the "Streets" shape file with
12000 lines is 5000 KB. Whereas the size of the output shape file
"ShortestPath" with only 6000 lines is 270,000 KB. Is there a way to reduce
the file size? The reason is I need to upload this in a different platform
which cannot accept shapefiles larger than 10,000 KB.

[image: image.png]
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Re: [Qgis-user] Apache Solr in QGIS

[Nicolas Cadieux]

You could create a plugin I guess…

https://docs.qgis.org/3.16/en/docs/pyqgis_developer_cookbook/plugins/index.html

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 29 juin 2021 à 03:19, Christoph Jung  a écrit :
> 
> Hello everyone,
> 
> Does anybody know, if it is possible, to integrate a search platform like 
> Apache Solr into QGIS, maybe in the search bar at the bottom of the window?
> 
> Greetings,
> Christoph
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Re: [Qgis-user] Can you help me?

[Nicolas Cadieux]

Hi,
You have multiple tools that can help.  You can use the QGIS network plugins.  
It’s already installed but you need to activate the « processing » plugin.  You 
will find multiple shortest path analysis.  

You can also install the Chinese postman plugin made to calculate the most 
efficient route.  You will find a lot of other plugins if you search the plugin 
directory with the tag « network analysis ». 

The plugin QNEAT3 is well done and well documented. It was interesting OD 
matrixes (origine-destination).  

You will most likely need to look at home grown plugins for this type of work.

https://plugins.qgis.org/plugins/tags/network-analysis/

https://plugins.qgis.org/plugins/chinesepostman/

https://root676.github.io/


Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 29 juin 2021 à 05:45, Antonio Mattei  a écrit :
> 
> 
> Dears Members,
> I have read all the Qgis manual.
> I found it a fundamental aid for navigation and I also found this very 
> interesting.
> However, I couldn't understand out if Qgis can solve my problem or not…
> .
> At first glance I don't think so but I want to be sure of this.
> So I try to explain better what I have to do, what I am looking for.
> For the moment I have to chart a course without considering the prevailing
> weather, winds and currents.
> This is because I will have to leave on April 12, 2022 from Monaco in the
> Mediterranean and return there after having touched 150 ports in an
> expedition that will last about a year around the globe.
> I accepted the assignment on behalf of the World Health Organization for a
> Post Covid19 project. I have always been involved in Fundraising and NGOs
> (Non-Governmental Organizations) and have been commander of commercial
> boats since 1983.
> The expedition will depart from Monaco (Monte Carlo, between Italy and
> France) and will have to touch the 150 ports of the UN countries that have
> access to the sea, before returning to Monte Carlo after about a year.
> This is to raise awareness in all countries of the world and to bring
> unused vaccines in richer countries to poorer ones.
> It is an expedition in which all participants will be volunteers funded by
> the European Union, the UN and the WHO.
> We will start with an icebreaker and 8 different commanders will alternate
> in command of which I will be the first and last and it is also up to me to
> calculate the route.
> Starting from Montecarlo then we will have to touch all the countries of
> the world.
> I am looking for help to do this.
> My idea is to start from Monte Carlo and first touch all the countries of
> the Mediterranean and the Black Sea, then go through Suez and
> Circumnavigate Africa clockwise after also touching Pakistan and India, go
> up to the Baltic Sea and Iceland and get to New York.
> From there go down to Cuba and then up to Suriname and then go back, go all
> the Caribbean and pass in the Pacific from Panama to do the whole Pacific
> coast, Cape Horn up to Rio Grande in Brazil and then up to Japan and
> Australia.
> Do all the Far East and then return to the Mediterranean from the Indian
> Ocean and Suez.
> But I'm not sure this is the shortest route.
> This is why I am looking for a software or an app capable of automatically
> calculating the best route starting from Monte Carlo and returning to Monte
> Carlo after having touched 150 different ports.
> Not a precise navigation route, which then should take into account the
> weather, currents and winds and that we can do just before leaving, but a
> rough route. A route that tells me in which sequence it would be better to
> touch all the ports to cover the minimum distance and save as much fuel as
> possible.
> If you can help me or if you think Qgis is capable of doing this let
> me know.
> Greetings
> Antonio
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Re: [QGIS-it-user] Operazioni con codici colore

[Andrea Giudiceandrea]

Ciao Massimo,
non ho ben capito cosa esattamente intendi con "sommare codici colore", 
comunque ti segnalo che il calcolatore di campi supporta varie funzioni 
per gestire i colori:

https://docs.qgis.org/3.16/en/docs/user_manual/working_with_vector/functions_list.html#color-functions

A presto.

Andrea
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[Qgis-user] Can you help me?

[Antonio Mattei]

Dears Members,
I have read all the Qgis manual.
I found it a fundamental aid for navigation and I also found this very
interesting.
However, I couldn't understand out if Qgis can solve my problem or not…
.
At first glance I don't think so but I want to be sure of this.
So I try to explain better what I have to do, what I am looking for.
For the moment I have to chart a course without considering the prevailing
weather, winds and currents.
This is because I will have to leave on April 12, 2022 from Monaco in the
Mediterranean and return there after having touched 150 ports in an
expedition that will last about a year around the globe.
I accepted the assignment on behalf of the World Health Organization for a
Post Covid19 project. I have always been involved in Fundraising and NGOs
(Non-Governmental Organizations) and have been commander of commercial
boats since 1983.
The expedition will depart from Monaco (Monte Carlo, between Italy and
France) and will have to touch the 150 ports of the UN countries that have
access to the sea, before returning to Monte Carlo after about a year.
This is to raise awareness in all countries of the world and to bring
unused vaccines in richer countries to poorer ones.
It is an expedition in which all participants will be volunteers funded by
the European Union, the UN and the WHO.
We will start with an icebreaker and 8 different commanders will alternate
in command of which I will be the first and last and it is also up to me to
calculate the route.
Starting from Montecarlo then we will have to touch all the countries of
the world.
I am looking for help to do this.
My idea is to start from Monte Carlo and first touch all the countries of
the Mediterranean and the Black Sea, then go through Suez and
Circumnavigate Africa clockwise after also touching Pakistan and India, go
up to the Baltic Sea and Iceland and get to New York.
>From there go down to Cuba and then up to Suriname and then go back, go all
the Caribbean and pass in the Pacific from Panama to do the whole Pacific
coast, Cape Horn up to Rio Grande in Brazil and then up to Japan and
Australia.
Do all the Far East and then return to the Mediterranean from the Indian
Ocean and Suez.
But I'm not sure this is the shortest route.
This is why I am looking for a software or an app capable of automatically
calculating the best route starting from Monte Carlo and returning to Monte
Carlo after having touched 150 different ports.
Not a precise navigation route, which then should take into account the
weather, currents and winds and that we can do just before leaving, but a
rough route. A route that tells me in which sequence it would be better to
touch all the ports to cover the minimum distance and save as much fuel as
possible.
If you can help me or if you think Qgis is capable of doing this let
me know.
Greetings
Antonio
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Re: [Qgis-user] Angle of view

[Matt Boyd]

It sounds like you want to calculate the bearing or azimuth from the
camera position to each point on the raster. This would give you the
direction from the camera to the position, then rotate the result so
it aligns with the direction of the camera. You could probably just
create the basic plot once and then just rotate it to match the camera
direction each time.
I'd do it using a regular grid of points and the calculator, then
interpolate that onto a raster if thats what you want.
essentially arctan(dy/dx) with some rotation and conversion from
radians to degrees.

I've done something similar in python, but for flow direction between
nodes in a drainage network, might be overkill.

Good luck

On Fri, Jun 25, 2021 at 4:09 AM Surya Jarausch  wrote:
>
> Dear Qgis-Users,
>
> I am relatively new to Qgis and working on a project to georeference 
> webcam-images and then determine the areas covered with snow.
>
> To get an estimation of the quality of the projection, I would like to create 
> a raster with the values of the angle of view from a certain point – the 
> camera position. If the angle is near 90° the projection is likely to be 
> accurate, the more it becomes an pointed angle, the bigger possible errors 
> will get.
>
> I already created a viewshed to determine the visible areas of the DEM.
>
>
>
> I would be grateful if you could help me out,
>
> Surya.
>
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Re: [Qgis-user] Multiple lines issue in labelling

[DelazJ]

Hi,

Le mar. 29 juin 2021 à 06:09, Patrick Dunford  a
écrit :

> It comes down to a perspective of how intuitive a UI feature should be.
>
> The placement tab is a new feature in recent versions of Qgis and that's
> down to a subjective classification of things into "placement" options or
> whether there is a better way of classifying the settings that keeps them
> together in the same tab of the dialog.
>
You meant multiline is new feature (>= QGIS 3.4 I think) because placement
tab is an old tab (QGIS 2.0
).
If you have suggestions, do not hesitate.

> You could put a message above the multiline section saying " this section
> is disabled because curved has been selected in other tab" or words to that
> effect.
>
Could help indeed. Mind opening an issue report or provide a pull request?
Thanks

Regards,
Harrissou

> On 27/06/21 6:51 pm, DelazJ wrote:
>
> Hi,
> These are quite different features I can't see how they would stay in the
> same tab, despite I understand your point.
> Anyway, note that the multilinear options are disabled because these
> functionalities are not YET implemented for curved labels. See
> https://github.com/qgis/QGIS-Enhancement-Proposals/issues/62
>
> Regards,
> Harrissou
>
> Le 25 juin 2021 04:43:11 GMT+02:00, Patrick Dunford
>   a écrit :
>>
>> Yes it was set with that.
>>
>> This does raise a question of the software design. I got an introductory
>> course in interface design many years ago, and we were taught a control
>> that enables or disables a part of a user interface should not be placed in
>> a different page of a multi tabbed dialog.
>> On 25/06/21 1:08 am, DelazJ wrote:
>>
>> Hi Patrick,
>> Do you set a curved placement for the labels?
>>
>> Harrissou
>>
>> Le jeu. 24 juin 2021 à 13:22, Patrick Dunford 
>> a écrit :
>>
>>> Good day
>>>
>>> I have used the multiple lines feature in labelling some of my layers.
>>> However for some inexplicable reason this section in some layers is
>>> grayed out (disabled) and cannot be accessed.
>>>
>>> All layers are Spatialite but this should have no relevance as the
>>> labelling settings are stored in the project file rather than with the
>>> layers data files.
>>>
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> brièveté.
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Re: [Qgis-user] Separate or combined windows for Qgis canvas and Layout (or being able to dock the Python scripting console panel to a Layout window)

[Luigi Pirelli]

Hi Patrick

seems more a question for the developer list where many UX involved people
can give you opinions.

Luigi Pirelli

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On Tue, 29 Jun 2021 at 05:48, Patrick Dunford 
wrote:

> Just have a question here about the use of separate application windows
> for the Qgis application main window and the Layout window. Obviously
> the separate layout windows can be multiple in number whereas most of
> the time we only need one application main window open.
>
> However for me there is the question of having different toolbars and
> panels available in the two different types of window. Whilst they do
> fulfill different functions of the application, the crossover between
> those functions that is easy to achieve when running a script somewhat
> blurs the merits of separate windows and raises the question of why
> panels and toolbars can only be used in one or the other windows but not
> both.
>
> In other words should you have the two distinct types of window or one
> window that can have a combination of panels and toolbars from anywhere.
> Granted that that would be a challenge if implemented to its fullest
> extent since most of the panels and toolbars are specific to each window
> type and the canvas would have to become some sort of panel as well.
>
> My view on this is mostly driven by the apparently reasonable conclusion
> that the Python scripting console panel should not be limited to only
> being able to be docked to the application main window instead of the
> layout window as is currently the case. I have a script that performs a
> layout export to image and I have to keep switching backwards and
> forwards between the main window and the layout window to run the
> script, which can be for hundreds of export operations in a day. The
> script itself reduces the number of mouse clicks needed to run each of
> the individual exports by automatically selecting the layers to make up
> an export in the main window.
>
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[Qgis-user] Apache Solr in QGIS

[Christoph Jung]

Hello everyone,

Does anybody know, if it is possible, to integrate a search platform like 
Apache Solr into QGIS, maybe in the search bar at the bottom of the window?

Greetings,
Christoph
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