Re: [Qgis-user] Readonly geometries

[Francesco Pelullo via QGIS-User]

Il lun 23 ott 2023, 20:58 Simon Gröchenig via QGIS-User <
qgis-user@lists.osgeo.org> ha scritto:

>
> is it possible to set geometries to readonly while attributes are editable?
>

QGIS has not this feature and, in my opinion, this is a marginal problem.

If you need to block geometry editing, and you want to allow only attribute
editing, then you are most likely thinking about working in a group with
other people. QGIS has so many problems with simultaneous editing of data
(both geometries and attribute tables), that your request to block only
this or only that doesn't matter, because it won't work anyway.

Conversely, if I have misunderstood and you want to work alone with a
"lock" on geometries, then the solution of your request maybe exists, maybe
not, but it doesn't matter anyway because it would be so cumbersome that
you would do well to avoid it. You'd sooner learn what buttons not to
press, or edit only from the attributes table, and the geometries will be
safe.

The solution you're looking for is a relational database with various
levels of privileges on the schema, but that's PostGIS, you don't have to
try shortcuts through QGIS.

My two cents.

Hi
Francesco
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Re: [Qgis-user] QGIS 3.22 - Geometry by expression howto

[Francesco Pelullo via QGIS-User]

Hi Nicolas,

Il giorno dom 1 gen 2023 alle ore 04:53 Nicolas Cadieux <
njacadieux.git...@gmail.com> ha scritto:

> 
>
> Try decimal with commas. Check your local system settings.  Could this be
> a wrong CRS problem?  Try zoom to layer extent to see if they pop up in the
> wrong place.  Share a few examples so we can check. Try  exporting the
> geometries to Wkt in a new field to see what happens….
>

Thank you for your suggestions, particularly the "geom_to_WKT", it let me
discover problem.
IMHO this is a bug in "geometry by expression" algorithm.

By my exoeriences, this algorithm works _only_ if source layer has at
almost one feature.
If so, you can add new feature by this expression:
make_point(to_real(@Long),to_real(lat))
where @Long and @Lat are two project variables. Everything works as
expected.

Otherwise, e.g. when the source layer has no feature (empty layer), the
geometry by expression fails and return  geometry, even if the
preview in expression generator is correct.

In my test, i was usual to truncate the source layer before generate new
geometry.
This caused the fail of geometry by expression algorithm.

Instead, if i don't truncate source layer (and it has at almost one
geometry before running the model), then the algorithm works.

This is a bit confusing, because in the  "geometry by expression"
documentation there is no reference to this condition.
Could this be a bug?
Is it possible to add new features to a empty layer with geometry by
expression?

Again, thank you to everyone and have a nice year!

Francesco
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Re: [Qgis-user] QGIS 3.22 - Geometry by expression howto

[Francesco Pelullo via QGIS-User]

Il sab 31 dic 2022, 16:35 Andrea Giudiceandrea via QGIS-User <
qgis-user@lists.osgeo.org> ha scritto:

is the preview result of the  make_point(to_real(@long), to_real(@lat))
> expression displayed in the expression editor correct?
>

Yes, It reports ""

Have you checked if the preview results of the @long, @lat, to_real(@long)
> and to_real(@lat) are correct?
>

Yes, they are correct and I am usual to store project variables in my
models, then read them as to_real(@something) because some time there are
problems with decimal points.

What is the char used as decimal separator in the @long and @lat variables
> value?
>

Separator for decimals is dot, i correctly formatted it.

Other suggestions?

Have an Happy New Year to everyone.

Francesco
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[Qgis-user] QGIS 3.22 - Geometry by expression howto

[Francesco Pelullo via QGIS-User]

Hi all,

Just trying to use algorithm "Geometry by expression" in a model, It don't
works for me.

I created a new model with three inputs parameters:

1. Longitude (real)
2. Latitude (real)
3. Map layer (points).

My goal is to empty [3],  memorie coordinate values in two project
variables (@long and @lat), then add a new feature at (@long , @lat)
position.

I suppose can use "Geometry by expression" but result Is 

My settings:

Input layer = using model input = [3]
Output geom type = Point
Z dimension and M values = No
Geometry expression= make_point(to_real(@long), to_real(@lat))
Modifief Geometry = temp layer

The result Is ever a null geometry.

@long and @lat are correctly created and updated every time i run model.

Map layer Is EPSG:4326

Ideas?

Best wishes to everyone

Francesco
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Re: [Qgis-user] Parameters order in Model Designer input form

[Francesco Pelullo via QGIS-User]

Il lun 26 dic 2022, 12:10 Alexandre Neto  ha scritto:

>
>> Is there a method or some trick for let I have parameters input in some
>> specific order I like?
>>
>
> There's a option to order the the inputs in the model menu.
>

Thank you, that's perfect.

Regards
Francesco

>
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[Qgis-user] Parameters order in Model Designer input form

[Francesco Pelullo via QGIS-User]

Hi all and have a nice holydays,

I'm trying to understand logic (if there Is one) of Model Designer
parameters input form.

I make a list of parameters needs to be input, but when the model runs, the
form has a random order in parameters list to be input.

Is there a method or some trick for let I have parameters input in some
specific order I like?

Also, is there any method for splitting parameters form in more than one
form, e.g. making it more simplex with few parameters fields input and then
a "NEXT" button for the others ?

Please can anyone address me to some help page about processing models
forms? It seems to me there aren't.

QGIS 3.22 LTR on Win10.

Thank you

Francesco
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Re: [Qgis-user] Qgis : Create Package (GPK) with custom style and Spatial area?

[Francesco Pelullo via QGIS-User]

by the way, i just finished fighting against the Package Layer toolbox, in
my case the layer style is saved in the geopackage only if you run the
packaging layer algorithm without any previous algorithm. If you need to
store the style in the geopackage, you must run the algorithm package layer
twice, a first time at the start of processing (overwrite geopackage, save
style in geopackage) and a second time at the end of processing (don't
overwrite geopackage, don't save style in geopackage). Otherwise, if you
run  other algorithms before, (like select by attribute, select by position
etc) the style is not saved. Does this happen to you too?

Il ven 16 dic 2022, 17:01 celati Laurent via QGIS-User <
qgis-user@lists.osgeo.org> ha scritto:

> Hello,
> With Qgis 3, With the tool available in "Processing" "Layer packaging",
> package layers within a GeoPackage database by saving the style. But unless
> I am wrong, it does not allow to customize the export to a custom spatial
> Area of Intrest (for example area of the canvas).
> Conversely, via the "layers panel", you can right-click -> export as save
> in a GPK, to a personalized spatial footprint. But at this level, I don't
> feel it's possible to keep the style.
>
> => Would there be a tool in Qgis combining these 2 possibilities? To
> package in a GPK a selection of layers, to save not only the layers but
> their styles defined in the same personalized extent (for exemple the
> extent of the canvas ? )
>
> Thanks a lot.
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Re: [Qgis-user] Qgis low CPU and Memory load

[Francesco Pelullo]

Il ven 16 apr 2021, 02:56 Stewart Holt  ha scritto:

>  Parallelizing script execution is complex and I doubt that it is
> currently done in QGIS.
>

That's true.

In Settings / Options / Rendering / there's a checkbox for render layers in
parallel using as many CPU cores you want, but It Is enabled by default so
I suppose that there are no others settings that could make QGIS more
aggressive in CPU usage.

>
Regards



>
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[Qgis-user] Setting a project variable from processing modeler

[Francesco Pelullo]

Hi list,

is there an algorithm for setting a project variable from a modeler
algorithm?

I found this:
https://gis.stackexchange.com/questions/359386/is-there-a-way-to-edit-project-variables-with-modeller-in-qgis

but if I add this script to the modeler, QGIS 3.10 shows error:
AttributeError: type object 'QgsProcessingAlgorithm' has no attribute
'FlagSkipGenericModelLogging'

Any help appreciated.
Thank you
Francesco
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Re: [Qgis-user] QGIS really slow with .gpkg layers

[Francesco Pelullo]

Il gio 10 dic 2020, 16:50 Nicolas Cadieux  ha
scritto:

> Hi,
> I also used txt files to load LiDAR points in QGIS because .shp was not
> good.  This was before .gpkg came along, before I learned Python or
> CloudCompare.   I am just starting to familiarize myself with the
> geopackage format so i am no .gpkg expert but this is what I would do or
> ask myself:
>
> How are the files stored? Server, USB stick, hard-drive, SSD?
>

They are usually stored in a SMB server, accessible via VPN because this
Company has multiple offices. However, due to the really slowly data
access, projects and data are moved in local SSD disk before access/editing.



> Are the files in the same CRS as the project?  If not, every thing may be
> read in cache and reprojected even before you start...
>

Yes, projects and data layers are created with same CRS.


> What happens when the files are simplified?  Try more files and less
> layer, try more points in the same files.
>

This could be easy to do, i will check on next job.

Try a fresh project an open the layers one by one.  Is one more problematic
> than others?
>

No, It seems to me that geopackages becames slow after some days. E.g., if
i create a new project and new geopackages, qgis has no problems to open
them in a decent time (one or two minutes). But after some hours, if i
close qgis and restart it with the same project/data, access becames really
slow (15 minutes and more).



 Enough memory?
>

Win10, i5, 16GB RAM, SSD 1TB, dual screen.


Disable all plugins.
>

Ok.


> Caching features: in your QGIS options, you can change the amount of
> featured that are cashed when you open a lector layer.  Try cashing more
> feature or much less features (like 1).  What happens?  If you have a max
> of 16000 features per layer, chances are you are caching everything so
> everything is being loaded to memory.
>

Ok i will try.



> File creation: how are the files created?  Look at the options in Gdal if
> the files are created in QGIS.  https://gdal.orgdrivers/vector/gpkg.html Try
> creating the files with Gdal translate (vector menu) instead of just
> “export as” or save as in QGIS, force extra option to force index creation.
>

They are imported in qgis as CSV (are point geometries with a single
attribute as REAL) and then exported in gpkg format.
In export options, spatial index creation is enabled by default.


> Do you have a spatial index build in? In theory .gpkg comes with a spatial
> index but perhaps you can rebuild one? Or make sure you build on from the
> start when you create the file. (See above).
>

Sometime i run Vacuum from QGIS db manager. Also sometime i force a new
spatial index creation from layer properties, but with no appreciable
differences.



> I remember that when I created a .gpkg in python, and used it in ArcGis,
> the file would take a long time to open because it was reading every point
> of the file in order just  to get the files extent. Maybe that is going
> on?  I think you can specify the files extent in the file metadata.  (I
> would need to check my code but I don’t see my solution here. I normally
> post them whenI find them...).
>  
> https://gis.stackexchange.com/questions/374408/using-geopandas-generated-gpkg-in-arcmap
> 
>
>
> Just a bunch of ideas...
>

Thank you for your suggestions.
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[Qgis-user] QGIS really slow with .gpkg layers

[Francesco Pelullo]

Hi all,

I'm running QGIS 3.10 LTR on Windows 10.

My project has 6 .gpkg files connected, everyone of these has 14 layers
with points geometries, every layer counts about 16.000 features.

So my QGIS project manage about 1.344.000 points, not used at same time.

When i open this project, QGIS needs about 15 minutes for go ready.

Instead, if i store these points in separate .TXT files, QGIS needs only
few seconds for load layers and go ready. Also .shp layer format seems more
performant than .gpkg

It seems to me that they are not really efficient for these points layers.

Is this a my problem? Or there are some tricks i could use?

.gpkg are vacuumed regularly.

Best regards

Francesco
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Re: [Qgis-user] Loss of data

[Francesco Pelullo]

Ciao Vladut,

I'm sorry, you have no chanches to recover deleted attributes.

You need to populate attributes again.

However, in my mind, this could be not a impossible job.

SUP (area) attribute is a geometry dependant value, you could calculate
areas again with a simple string in field calculator.

TIPO (Type) attribute is the real problem, but since I suppose you
extracted it from some public data source, maybe you could use field
calculator again for extract data in minutes.

Don't worry, these are common experiences that would drive you to a more
prudent jobs management.

Also hope you will adopt another file format (.gpkg is great) and leave
shapefiles.

Ciao
Francesco



Il dom 15 nov 2020, 10:12 Vladut Constandoiu  ha
scritto:

> Good morning,
>
> My name is Vladut Constandoiu, I'm a university student from Trento, Italy
> and I'm using QGis for my master thesis.
> Yesterday I had a very unpleasant experience with QGis. I have a shapefile
> that contains all of the different areas of the river's hydrological basin
> on which I'm doing my project; every element has two attributes: type
> (TIPO) and area (SUP). Somehow I managed to erase those attributes from the
> attribute table and could not do undo (ctrl+z or anything else) since the
> auto-save plug-in activated exatly 2 seconds after  my mistake and saved
> the changes. The shapefile contains about 6900 elements, and they were all
> sorted by use, while now they are just areas without any information.
> Is there any way to recover a previous version of that shapefile so that I
> don't have to spend uncountable hours putting all the attributes back in?
> Here are three pictures of my work, previously and after the loss of
> information.
>
> Before data loss:
> [image: image.png]
>
> After data loss + legend of types of area:
> [image: image.png]
>
> Attribute panel:
> [image: image.png]
>
> I would be enormously grateful to anyone who could help me find a solution
> for this mess.
>
> Thank you very much in advance and have a nice day.
> Sincerely,
> Vladut Constandoiu
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Re: [Qgis-user] Import non-spatial table from ODBC?

[Francesco Pelullo]

Ciao Luca,

Yes, you can.

Open the Data Source Manager, add a new vector layer, then in the source
type choose "Database".

In the drop-down list, choose ODBC.

Obsiouvly, you need to create a connection to the database.

Regards

Francesco



Il mer 20 mag 2020, 15:30 Luca Manganelli 
ha scritto:

> Hello,
>
> Is it possible to import a non-spatial table from ODBC?
> So, I can use it to join the data with a vector layer.
>
>
>
>
> --
>
> Comune di Trento
>
> via Belenzani, 19 - 38122 Trento | C.F e P. IVA: 00355870221
>
> tel. +39 0461.884111 | www.comune.trento.it
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Re: [Qgis-user] GeoPackage deadlocks (Andrea Peri)

[Francesco Pelullo]

Il gio 17 ott 2019, 12:54 Patrick Dunford  ha
scritto:

> It's not a network issue and neither is it a Windows issue. Two
> processes accessing geopackage on a local computer can run into the same
> issue. SQlite is designed for a single user. It is very reliable when
> used as designed.
>

Maybe in next releases, QGIS could add a new function that create a
temporary .gpkg.lock file in same directory of .gpkg file and thus allows
other QGIS instances to open same .gpkg in read only mode.

Ciao
--FP
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[Qgis-user] Cross section in QGIS 3.4 LTR

[Francesco Pelullo]

Hi all,

I'm trying to generate vertical sections in QGIS.

Profile tool plugin is nice, but It only make sections of DTM raster.

Instead, I'd like to make sections of other layers too, e.g. of extruded
polygonal layer representing buildings.

A good solution could be QGIS2threejs, but It seem to me there are two
problems:

1. Can I make a vertical section in QGIS2threejs? E.g., can I "mask" or
filter or hide object between camera position and a certain
line/polygon/plane that represent the cutting line?

2. Can I compose a print layout with a QGIS2threejs view? Is It necessary
to export objects?


Thank you

Francesco
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Re: [Qgis-user] Text label with border in layouts

[Francesco Pelullo]

Il giorno gio 29 nov 2018 alle ore 23:02 Nyall Dawson <
nyall.daw...@gmail.com> ha scritto:

> On Thu, 29 Nov 2018 at 03:43, Francesco Pelullo 
> wrote:
>
> Not currently. A workaround is the use the "render as html" option and
> use html/css rules to draw buffers on the text.
>
>
>
OK, thank you.

Francesco
/niubii/ in OSM
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[Qgis-user] Text label with border in layouts

[Francesco Pelullo]

Hi again,

Is there any option for make fonts with borders in map layout text labels?
I can do it with style for entities from layers, not with text labels.

Thank you again
Francesco
/niubii/ in OSM
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[Qgis-user] Atlas features in a single page

[Francesco Pelullo]

Hi all,

I'm trying to generate a single layout with multiple maps, everyone of
these maps need to be controlled by atlas as usual.
In other words, I would like atlas generate map objects, not pages.

At the present, I can do it manually as follow:
- create a layout, let's say an A0 paper page with no objects;
- create a smaller map layout (let's say, "Map1"), this will be 120x120mm
so it will not cover entirely the layout;
- generate Atlas as usual;
- change properties of Map1 to "controlled by atlas";
- change page in the atlas, until "page 1" will appears;
- at this point, "Map1" has been generated by atlas;
- change properties of Map1 again, now disable "controlled by atlas";
- copy/paste Map1 on the A0 layout, adiacent to Map1, it will became "Map2";
- setup properties of Map2 to "controlled by atlas";
- change page in the atlas, now Map1 will stay as generated by "page 1" and
Map2 will update to "page2";
- edit properties of Map2, disable "controlled by atlas";
- and so on

I want to generate a single map layout wich contain dozen of map objects,
is there any solution more simple or efficient?
Thank you

Francesco
/niubii/ in OSM
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Re: [Qgis-user] Can anyone confirm corrupted QGS-Files?

[Francesco Pelullo]

Hi,

some days ago me and another person in our office had the same
problem: lost entities from a shapefile while editing.

I was editing a puntual shapefile and lost dozen of points, I need to
digitize them again (and again and again and again...).  More or less
I lost 50 points over a total of 230 points and need to input them
again, I saved the project and the shapefile at every entity input but
it was unuseful.

My collague, instead, was working on a linear shapefile. He lost many
entities while editing (100 lines over a total of 300), but these
entities "returns" later  and therefore he had two or more duplicated
entities.

QGIS 3.2.3 on Win10, project in QGIS 3 format (.qgs). We was working
on different projects, different shapefiles. Files was archived on a
network shared directory.

We switchet to rel 3.2. some days ago and this is the first project
with new release. Never had these problems with QGIS 2.18.

Best regards
Francesco AKA /niubii/



2018-10-23 14:10 GMT+02:00, Kai Borgolte :
> Am 19.10.2018 um 09:31 schrieb Kai Borgolte:
>
>> today it's the second time my coworker worked on a corrupt QGS file.
>> Some content like layouts, symbology and labelling are not complete.
>> Last time he continued to work on the file, and the file size was a
>> quarter from qgs~. Today he quit QGIS without saving and the file seems
>> OK, so the corruption seems to introduce at load time.
>>
>> He is using QGIS 3.2.2 on Windows10.
>>
>> Does someone else see these problems?
>
> today we found the reason: he edited QGIS3-files in QGIS 2. In future je
> should save QGIS3-projects as .qgz.
>
> I had assumed, that QGIS 2 would warn about opening "future" files, but
> it seems it doesn't?
> --
> Kai Borgolte, Bonn
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-- 
Ciao
--FP
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[Qgis-user] QGIS 2.18.17 - Problem with DXF export

[Francesco Pelullo]

Hi all, this is my first message in this list.

I'm trying to export a QGIS project to DXF but with unexpected results.

In the DXF, some vertices of the polylines are moved, they appear to be
"hooked" to the vertices of other adjacent polylines.

The final result is that in the GIS I have two parallel lines, in the CAD I
have two lines that touch each other in more points.

The reference system is 25832 in the GIS, I have selected the same
reference system in the export phase.

Thank you
Francesco Pelullo
/niubii/
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