Re: [Qgis-user] Square Buffer

[Hugh Kelley via QGIS-User]

Oops, including the list.

Also, having now written the response and re-read your question, I would
guess that the coordinate system you are using is causing the distortion
you see in the result.

I'd be curious to see what others on the list might suggest as the best
option for crs as I think even state plane would be distorted at least a
little.

---‐--

Hi, not in front of my computer so I can't test but I would recommend
first, creating a round buffer with a diameter equal to the square side you
are looking for, and then second, using the "extent" tool that's in one of
the vector tools subcategories to extract the layer extent, creating the
square you need.

That should create a "square" although, importantly, the idea of a square
in the gis world is a little fraught as the coordinate system you are using
can sometimes produce odd results.

I would, at a minimum, use the measure tool to double check that what looks
like a square truly has a height equal to its width.

On Sat, Sep 30, 2023, 2:39 PM Michael Jabot via QGIS-User <
qgis-user@lists.osgeo.org> wrote:

> I apologize for posting what I think should be a simple task but I am
> stumped.
>
> I would like to create a 15 km square Buffer around a point for
> establishing a study site.
>
> I have used the buffer tool and set it to square and used 7.5 km as the
> distance. The buffer that is created is not square but instead is a longer
> on one set of sides.
>
> Again I apologize for bothering people with this ... thank you in advance
> for your help
>
> Mike
>
>
> *
>
> Michael Jabot, Ph.D.
> SUNY Distinguished Professor, Science Education
>
> US Partner - NASA GLOBE Program
>
> NASA Earth Ambassador
> Director, Institute for Research in Science Teaching
>
> Chancellor's Award Recipient for Excellence in Research
> The State University of New York at Fredonia
>
>
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>
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>
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Re: [Qgis-user] Pro tips for beginners

[Hugh Kelley via QGIS-User]

Maybe a more intermediate tip since it requires editing an svg file but I
really like the option to symbolize with a parameterized svg as described
in: https://gis.stackexchange.com/a/305207

On Thu, Sep 21, 2023, 8:44 PM Emma Hain via QGIS-User <
qgis-user@lists.osgeo.org> wrote:

> Thanks Michael and David!
> Keep them coming!!! (although I only have 5 mins lol)
>
> On Fri, 22 Sept 2023 at 00:55, David Strip 
> wrote:
>
>> Another "pro" tip (from a non-pro) -
>> Create keyboard shortcuts for frequently used commands, such as this one
>> suggested by Michael Duffy -
>>
>> -Copy and paste styles between layers.
>>
>>
>>
>>
>
> --
> Emma Hain — Product Manager/Senior GIS Analyst
> e...@north-road.com / 0414 512 782
> [image: https://north-road.com]
> *North Road*
> Cartography • Development • Spatial Analysis
> --
> *north-road.com* 
> 
> 
> 
>
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Re: [Qgis-user] Question Concerning Incorrect Color Shading in QGIS

[Hugh Kelley via QGIS-User]

Hi Aqshems,

To help move this along, I'd recommend opening a fresh qgis instance,
making a new user profile, and then dragging in your data source and
rebuilding the symbology.

If you get what you expect without any problems, I would then copy the
layer and paste it into the original qgis file. Then see if it remains as
expected.

If you run into issues working through those steps this will be closer to a
reproducible example of the problem. You can come back to the list to share
the data source, qgis file and version info from help >> about.
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Re: [Qgis-user] Building footprint extraction from satellite image

[Hugh Kelley via QGIS-User]

Hi,

Not exactly what your asking for but have you seen the Microsoft building
footprints work?

https://github.com/microsoft/USBuildingFootprints


That data, in combination with rapid or the mapwithai josm plugin has been
helpful to me on  building footprints work.

https://wiki.openstreetmap.org/wiki/Rapid

I've definitely seen problems with the footprints that need to be fixed
before they're added to osm but I would guess any image recognition based
footprints would need some cleanup.



On Sat, Aug 26, 2023, 2:52 AM Michael Hunt via QGIS-User <
qgis-user@lists.osgeo.org> wrote:

> Hi, I'm looking for a way to extract building footprints from satellite
> images.
>
> I already make scenery from the satellite images for my flight simulator
> using free software called AeroScenery.
>
> I can also make buildings, trees, night lights from OSM data using free
> software called ScenProc. However there are many areas that do not have
> sufficient OSM data in some cases missing hundreds of buildings. In the
> past I have spent many weeks hand editing using JOSM to replace missing
> buildings.
>
> Is there a way using QGIS with plugins to automate this process please?
>
> Kindest regards, Michael.
>
>
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Re: [Qgis-user] Error - Qgis files getting corrupted after saving

[Hugh Kelley via QGIS-User]

Glad it worked out!

As long as you rename every file in the shapefile renaming shoukd be fine.
Renaming just the .shp file will cause problems.

You might consider:
 http://switchfromshapefile.org/

Thanks to whoever on this list shared that originally.




On Wed, Aug 23, 2023, 2:20 AM Gómez Sánchez, Sandra <
sgome...@eservicios.indra.es> wrote:

> Hello Hugh,
>
> Thank you very much for your answer, the problem has been solved I will
> post here what was causing the issue, for you to know,
>
> When we were modifying the data inside qgis we were not exporting it but
> mashing the previous one by saving, and then changing the name of the file
> outside qgis, instead we exported the shp file from qgis and gave the file
> a new name from there, and the corruption of the file disappeared.
>
> Have a nice day! 
>
> [image: Opsait] 
>
>
> Sandra Gómez Sánchez
> --
> *De:* Hugh Kelley 
> *Enviado:* lunes, 21 de agosto de 2023 14:55
> *Para:* Gómez Sánchez, Sandra 
> *Cc:* qgis-user 
> *Asunto:* Re: [Qgis-user] Error - Qgis files getting corrupted after
> saving
>
> Hi Sandra,
>
> When you say "data" are you referring to spatial data saved in something
> like a shapefile geopackage etc, or the actual qgis file ending in .qgz or
> .qgs?
>
> If it is the actual qgis file itself that you are seeing corrupted, I
> would not expect a qgis file created by a newer version to be backwards
> compatible with and older version of qgis. I often see people using older
> versions run into weird problems when opening a file created by a newer
> version. Perhaps others will say otherwise but I don't expect this to a
> problem that can be solved. All users should be on a common version for the
> best experience.
>
> If its spatial data you're seeing corrupted that is something that should
> be solvable anf sharing what file type is being used might get you helpful
> suggestions.
>
> As a note, because opening and saving a qgis file with a different version
> can cause problems across versions, like loosing symbology settings, I
> backup my qgis work at least once a day so that I have something recent to
> fall back to if an issue like this occurs.
>
> Best,
>
> Hugh
>
> On Mon, Aug 21, 2023, 8:43 AM Gómez Sánchez, Sandra via QGIS-User <
> qgis-user@lists.osgeo.org> wrote:
>
> Hello there,
>
> I am facing an issue with the saving files from Qgis and importing them to
> another software.
>
> On this case, we are changing data inside Qgis and then import that data
> into Keycom.
>
> The thing is, we have 2 colleagues which are using Qgis 3.28.8 and 3.32.0
> versions and after they change the data inside qgis, and they save that
> data, the files get corrupted;
>
> I have been trying with my own qgis, which is 3.28.2 and in mine works
> perfect; I have changed their raw data and when I import that data on
> keycom it works, I have also sended them my own data (ready for import) to
> them, and they are able to import it, but once they put that data on their
> Qgis it gets corrupted and we can't work with it, we have checked the steps
> they are taking but they are doing the same as me,
>
> We did a silly test in which I sended them my data, they imported it into
> keycom, it worked, then they changed one single value inside Qgis and it
> got corrupted; so we know that the issue is located into the "saving" form
> from Qgis;
>
> We can open the files from Qgis again and they don't show signs of
> corruption inside, is just when we try to import them into keycom when the
> error is shown, so we are kinda lost here,
>
> is there any issue / feature we have to check for?
>
> Thank you very much,
>
> Sandra
>
> [image: Opsait] 
>
>
> Sandra Gómez Sánchez
>
> --
>
> Este correo electrónico y, en su caso, cualquier fichero anexo al mismo,
> contiene información de carácter confidencial exclusivamente dirigida a su
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> autorización está prohibida en virtud de la legislación vigente. En el caso
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> Evite imprimir este mensaje si no es estrictamente necesario.
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Re: [Qgis-user] Error - Qgis files getting corrupted after saving

[Hugh Kelley via QGIS-User]

Hi Sandra,

When you say "data" are you referring to spatial data saved in something
like a shapefile geopackage etc, or the actual qgis file ending in .qgz or
.qgs?

If it is the actual qgis file itself that you are seeing corrupted, I would
not expect a qgis file created by a newer version to be backwards
compatible with and older version of qgis. I often see people using older
versions run into weird problems when opening a file created by a newer
version. Perhaps others will say otherwise but I don't expect this to a
problem that can be solved. All users should be on a common version for the
best experience.

If its spatial data you're seeing corrupted that is something that should
be solvable anf sharing what file type is being used might get you helpful
suggestions.

As a note, because opening and saving a qgis file with a different version
can cause problems across versions, like loosing symbology settings, I
backup my qgis work at least once a day so that I have something recent to
fall back to if an issue like this occurs.

Best,

Hugh

On Mon, Aug 21, 2023, 8:43 AM Gómez Sánchez, Sandra via QGIS-User <
qgis-user@lists.osgeo.org> wrote:

> Hello there,
>
> I am facing an issue with the saving files from Qgis and importing them to
> another software.
>
> On this case, we are changing data inside Qgis and then import that data
> into Keycom.
>
> The thing is, we have 2 colleagues which are using Qgis 3.28.8 and 3.32.0
> versions and after they change the data inside qgis, and they save that
> data, the files get corrupted;
>
> I have been trying with my own qgis, which is 3.28.2 and in mine works
> perfect; I have changed their raw data and when I import that data on
> keycom it works, I have also sended them my own data (ready for import) to
> them, and they are able to import it, but once they put that data on their
> Qgis it gets corrupted and we can't work with it, we have checked the steps
> they are taking but they are doing the same as me,
>
> We did a silly test in which I sended them my data, they imported it into
> keycom, it worked, then they changed one single value inside Qgis and it
> got corrupted; so we know that the issue is located into the "saving" form
> from Qgis;
>
> We can open the files from Qgis again and they don't show signs of
> corruption inside, is just when we try to import them into keycom when the
> error is shown, so we are kinda lost here,
>
> is there any issue / feature we have to check for?
>
> Thank you very much,
>
> Sandra
>
> [image: Opsait] 
>
>
> Sandra Gómez Sánchez
>
> --
>
> Este correo electrónico y, en su caso, cualquier fichero anexo al mismo,
> contiene información de carácter confidencial exclusivamente dirigida a su
> destinatario o destinatarios. Si no es vd. el destinatario indicado, queda
> notificado que la lectura, utilización, divulgación y/o copia sin
> autorización está prohibida en virtud de la legislación vigente. En el caso
> de haber recibido este correo electrónico por error, se ruega notificar
> inmediatamente esta circunstancia mediante reenvío a la dirección
> electrónica del remitente.
> Evite imprimir este mensaje si no es estrictamente necesario.
>
> This email and any file attached to it (when applicable) contain(s)
> confidential information that is exclusively addressed to its recipient(s).
> If you are not the indicated recipient, you are informed that reading,
> using, disseminating and/or copying it without authorisation is forbidden
> in accordance with the legislation in effect. If you have received this
> email by mistake, please immediately notify the sender of the situation by
> resending it to their email address.
> Avoid printing this message if it is not absolutely necessary.
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Re: [Qgis-user] problem with GRASS custom variables

[Hugh Kelley via QGIS-User]

Hi Martin, I don't use grass with qgis much but I do have a guess.   When
you look at your installed programs, is it possible there are options for
"qgis" and then also a listing specifically for "qgis with grass".
Different operating environments might explain why you can't import from
grass as expected when opening gui qgis.

Hopefully someone has a more informed suggestion but this seemed worth
mentioning.

On Sat, Aug 5, 2023, 12:50 PM Martin Landa via QGIS-User <
qgis-user@lists.osgeo.org> wrote:

> Dear QGIS users,
>
> I have problem setting up custom GRASS-related variables in QGIS settings
> (use custom variables):
>
> [image: image.png]
> Unfortunately after restarting QGIS the statement below in Python Console
>
> from grass.pygrass.gis import Mapset
>
> fails with
>
> ImportError: Could not load grass_raster.8.4.
>
> When I set the same environmental variables before starting QGIS from
> shell than the pyGRASS statement *works*:
>
> GISBASE=/home/martin/src/grass/dist.x86_64-pc-linux-gnu
> PYTHONPATH=/home/martin/src/grass/dist.x86_64-pc-linux-gnu/etc/python
> LD_LIBRARY_PATH=/home/martin/src/grass/dist.x86_64-pc-linux-gnu/lib qgis
>
> Any idea why custom variables defined by QGIS settings fail in this case?
> Why are they behaving differently from environmental variables defined in
> the shell?
>
> Thanks in advance, Martin
>
> --
> Martin Landa
> http://geo.fsv.cvut.cz/gwiki/Landa
> http://gismentors.cz/mentors/landa
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Re: [Qgis-user] Error message

[Hugh Kelley via QGIS-User]

Hi, the two things I would try are 1, Saving the file as a .qgs file
instead of .qgz and 2, saving to a simple filepath like desktop or
downloads if you are not doing so already.

It might also be worth trying to save the file to a geopackage instead of
as a stand alone file.

On Fri, Jul 28, 2023, 4:54 AM Exchange via QGIS-User <
qgis-user@lists.osgeo.org> wrote:

> Dear list,
>
> I run QGIS 3.32.1 Lima on Windows 10 Version 2009
>
> Saving a project I get the following message:
>
> could not execute zip-file
>
> (Konte ZIP nicht durchführen)
>
> the only option left is to click the OK - Button.
>
> Saving the same project on the LTR-Version works.
>
> Is this a bug?
>
>
> --
> Mit freundlichen Grüßen
>
>
> Thomas Struller
> Diplom Geologe (Univ.), BDG, V18
>
> Sachverständiger nach BBodSchG §18,
> SG1 Historische Recherche
> SG2 Pfad Boden – Gewässer
> Akademischer Geoinformatiker
> Privater Sachverständiger der Wasserwirtschaft
>
> Tel: +49 911 12076 111
> Mobil:+49 170 33 20 494
> Mail: thomas.strul...@lga-geo.de
>
>
> LGA Institut für Umweltgeologie und Altlasten GmbH
> Christian-Hessel-Straße 1
> 90427 Nürnberg
> i...@lga-geo.de
> www.LGA-geo.de
>
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Re: [Qgis-user] Dot Density Symbology

[Hugh Kelley via QGIS-User]

Thanks all for the conversation and helpful thoughts.

I finally had time this morning to read through and try things in qgis.

For a polygon or multipolygon in the symbology settings, the random Marker
fill seems to meet the need well. That should save me a lot of time!

Have a good weekend all.

On Thu, Jul 27, 2023 at 7:44 PM Shinoto, PD Dr. Maria via QGIS-User <
qgis-user@lists.osgeo.org> wrote:

> Oops, this was in my Spam folder. It seems that this is the solution to
> the problem. Thanks a lot!
> Maria
>
>
> Am 2023/07/28 um 08:04 schrieb Alexandre Neto <
> alexandre.n...@qcooperative.net>:
>
> Hello Hugh,
>
>
> https://docs.qgis.org/3.28/en/docs/user_manual/style_library/symbol_selector.html#random-marker-fill
>
> Check the random marker fill. I believe it's what you are looking for. As
> you can see in the docs, you can decide how many points you want to insert
> inside the polygon. This option can be derived of each feature attributes
>
> Best regards,
>
> Alexandre Neto
> User Support
> www.qcooperative.net
>
> A quinta, 27/07/2023, 18:27, C Hamilton via QGIS-User <
> qgis-user@lists.osgeo.org> escreveu:
>
>> This may not be an answer to your question, but the Density Analysis
>> plugin (https://plugins.qgis.org/plugins/densityanalysis/) will create a
>> uniform set of polygons over an area of interest with a NUMPOINTS attribute
>> of the number of points are contained within the polygon. The NUMPOINTS
>> value can be weighted using some other attribute. It will automatically
>> style the density map as well from a given color ramp.
>>
>> Calvin
>>
>> On Wed, Jul 26, 2023 at 8:06 PM Shinoto, PD Dr. Maria via QGIS-User <
>> qgis-user@lists.osgeo.org> wrote:
>>
>>> Hi,
>>>
>>> I have a similar research problem, and the dots seem to be a wonderful
>>> solution.
>>>
>>> So, this email does not give any assistance re the original question,
>>> just an answer to the question below:
>>>
>>> Am 2023/07/27 um 03:45 schrieb chris hermansen via QGIS-User <
>>> qgis-user@lists.osgeo.org>:
>>>
>>> Here's (apologies for the closed source link) an example of the type of
 map/symbology I'm trying to describe.
 https://www.arcgis.com/apps/mapviewer/index.html?webmap=30d2e10d4d694b3eb4dc4d2e58dbb5a5

 Thanks for any suggestions!

>>>
>>> What about just shading the polygons using a gray scale?
>>>
>>> Given that your polygons should generate a uniform density of dots
>>> within the area they bound, I don't see value in generating the dots for
>>> symbology.
>>>
>>>
>>> The polygon area may vary, as it does in my research (distribution of
>>> burials in administrative areas). Therefore, a small area always looks
>>> underrepresented as compared to a larger area, and vice versa. I have large
>>> administrative areas with low densitiy, but they look well populated even
>>> with a very light shade of grey.
>>>
>>> So I would like to try to find a solution to Chris' problem since the
>>> representation with dots is closer to reality than colouring areas. I will
>>> report when I found a solution for my use case -- though this may be
>>> autumn...
>>>
>>> Maria
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-- 
Hugh Kelley
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[Qgis-user] Dot Density Symbology

[Hugh Kelley via QGIS-User]

Hi all,

I've been producing dot density maps for demographics work by using postgis
to assign points randomly within a polygon with the number of points
determined by, for example, the total number of a population sub-group
residing in that polygon.

I"m wondering if there might be a way to do this directly from the polygons
in QGIS with symbology.

I've looked through the resource sharing plugin without luck. I dont' think
the geometry generator can handle such a task but maybe there's a way?

Here's (apologies for the closed source link) an example of the type of
map/symbology I'm trying to describe.
https://www.arcgis.com/apps/mapviewer/index.html?webmap=30d2e10d4d694b3eb4dc4d2e58dbb5a5

Thanks for any suggestions!

Hugh
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[Qgis-user] visibility when selecting one of several points in a location

[Hugh Kelley via QGIS-User]

Hi all,

Sometimes when working with data, especially points, I'll have a stack of
several points in the same location, usually when the accuracy of the x/y
values is low.

In a lot of cases, if I'm selecting a point in a "stack" it will not appear
selected since it's covered by another point.

My understanding is that point drawing order is a function of the
datasource's row order.

I can solve my problem by using rule based symbology consistent with the
selection expression and turning off the "else" rule.

I'm wondering if there is any other shortcut I might use to avoid
rebuilding the symbology. Is there any way to set the drawing order so that
a selected feature is at the top? Or maybe to highlight a selected feature
so that it's slightly larger in addition to yellow.

thought I'd ask about existing solutions before considering putting
together a feature request/proposal/pr to expand the size of a selected
point/line/polygons.

Thanks!


Hugh
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Re: [Qgis-user] painful file-browser

[Hugh Kelley via QGIS-User]

Thomas, not the solution you are looking for most likely but I rarely use
the qgis file navigator.

Generally I can either drag files in from windows file explorer directly or
paste in a file path, replacing \ with / as needed. Shift - right click
will allow you to copy the path of a file.

The one exception to this I run into occasionally is renaming a layer in a
gpkg, in that case I still navigate to the gpkg in the browser and rename
there, but maybe someone has a workaround for that too.

Best, hugh

On Mon, Mar 6, 2023, 9:33 AM Thomas Struller via QGIS-User <
qgis-user@lists.osgeo.org> wrote:

> Hallo,
>
>
>
> sorry that I start again this issue, but working with the file-browser in
> qgis 3.28.4 ltr or 3.30 is very, very slow and painful. In fact working
> with qgis is not possible.
>
>
>
> My installation:
>
> Win 11 pro on think pad AMD Ryzen 7 PRO 4750U with Radeon Graphics   1.70
> GHz, 32 GB
>
>
>
> Connected network drives on window-server 2016
>
>
>
> What I did:
>
>
>
> New profile -> no result, the same painful „speed“ in qgis filebrowser
>
> Disable of esri file gdb driver -> no result
>
> Hide of not nessecary network drives -> no result
>
>
>
> Are there some hints out there to bring qgis to a „normal“ work speed with
> ist file-browser?
>
>
>
>
>
> Freundliche Grüße
>
>
>
> Thomas Struller
>
> Diplom Geologe BDG, V18
>
> *akademischer Geoinformatiker*
>
> *Sachverständiger nach BBodSchG §18*
>
>
> *SG1 historische Recherche SG2 Pfad Boden-Grundwasser*
>
> *privater Sachverständiger der Wasserwirtschaft*
>
>
>
>
>
> T  +49 911 12076-111
>
> M +49 170 3320494
>
> thomas.strul...@lga-geo.de
>
>
>
> LGA Institut für Umweltgeologie und Altlasten GmbH
>
> Christian-Hessel-Straße 1 | 90427 Nürnberg
>
> Geschäftsführung: Carlo Schillinger | Dr. Jürgen Kisskalt
>
> Gesellschaftssitz: Nürnberg | Registergericht Nürnberg HRB 18895
>
> i...@lga-geo.de | LGA-geo.de  | Datenschutz
> 
>
>
>
> Wir sind auf dem Weg zu einem papierfreien Büro.
> Berichte, Rechnungen und weitere Dokumente empfangen und
> versenden wir bevorzugt elektronisch per E-Mail.
>
>
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Re: [Qgis-user] use Binary (Blob) in writeAsVectorFormat

[Hugh Kelley via QGIS-User]

Hi Chris, thanks for that!

It would not have surprised me if the attribute datatype was simply not
compatible with shapefile, plenty of other things are not.

What I'm seeing in QGIS is that the gui interface for exporting a layer has
an option for handling a binary blob attribute type and indeed when the
option is checked, the new shape file is created without a warning or
error.

What I'm trying to figure out, I think, is how to put that option to work
via pyqgis.

Is there perhaps a way to see the exact command that the export data
interface is running successfully? I think ive seen the processing plugins
show the command to be run, or at least all the parameters in the interface
while a process is going, but the export data utility just closes and shows
progress in the bottom of the main qgis window as it works.

Alternatively, If there is an example somewhere of how to exclude
attributes by type when exporting with pyqgis I could just exclude
attributes that are causing problems for now. I've searched around for that
a bit but haven't turned up an exact example of it. It's straightforward to
get and check the types of a layers attributes but I haven't figured out
how to pass a subset of attributes to the writeasvector function.

Thanks!


On Fri, Feb 3, 2023, 5:13 PM chris hermansen  wrote:

> Hugh and list;
>
> On Fri, Feb 3, 2023 at 11:41 AM Hugh Kelley via QGIS-User <
> qgis-user@lists.osgeo.org> wrote:
>
>> to follow up as I continue to work on this,
>>
>> I mistakenly understood the attribute type "binary" as a Boolean, but I
>> think it's in fact an arbitrary value stored as binary. That is to say, not
>> necessarily True/False or 0/1 but a series of 0/1's storing a value.
>>
>> If I can save it to the shapefile that would be great but I'm going to
>> work on filtering those attributes out of what's saved as that's an
>> acceptable solution too I think.
>>
>> On Fri, Feb 3, 2023 at 2:24 PM Hugh Kelley  wrote:
>>
>>> Hi,
>>>
>>> I'm attempting to use pyqgis to export a few things to shapefile.
>>>
>>> the code below is working well except that a few of the attributes are
>>> incompatible with shapefiles (amazing) lack of a binary datatype.
>>>
>>> ```py
>>> pathToFile = "C:/Users/hkelley/Downloads/test_exports/
>>>
>>> layers = QgsProject.instance().mapLayers()
>>>
>>> for layer_id, layer in layers.items():
>>> print(layer.name())
>>> QgsVectorFileWriter.writeAsVectorFormat( layer,  pathToFile+
>>> layer.name() + ".shp", "utf-8", layer.crs(), driverName="ESRI
>>> Shapefile" )
>>> ```
>>>
>>> I see in the manual export options that I can check a box telling the
>>> export process to use "Use Binary (BLOB)". Image linked below for clarity
>>> [0]
>>>
>>> I haven't yet figured out how to pass that option to
>>> writeAsVectorFormat.
>>>
>>> any suggestions?
>>>
>>> Iv'e had a pretty thorough look through the docs for writeAsVctorFormat,
>>> is the solution related to
>>> QgsVectorFileWriter.BoolOption(QgsVectorFileWriter.BoolOption)?
>>>
>>>
> Have you looked at this https://en.wikipedia.org/wiki/.dbf to understand
> how attributes are stored in .dbf files?
>
> In particular there you will see this comment:
>
> *All field data is ASCII. Depending on the field's type, the application
> imposes further restrictions: *
>
> Does this help?
> --
> Chris Hermansen · clhermansen "at" gmail "dot" com
>
> C'est ma façon de parler.
>
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Re: [Qgis-user] use Binary (Blob) in writeAsVectorFormat

[Hugh Kelley via QGIS-User]

to follow up as I continue to work on this,

I mistakenly understood the attribute type "binary" as a Boolean, but I
think it's in fact an arbitrary value stored as binary. That is to say, not
necessarily True/False or 0/1 but a series of 0/1's storing a value.

If I can save it to the shapefile that would be great but I'm going to work
on filtering those attributes out of what's saved as that's an acceptable
solution too I think.

On Fri, Feb 3, 2023 at 2:24 PM Hugh Kelley  wrote:

> Hi,
>
> I'm attempting to use pyqgis to export a few things to shapefile.
>
> the code below is working well except that a few of the attributes are
> incompatible with shapefiles (amazing) lack of a binary datatype.
>
> ```py
> pathToFile = "C:/Users/hkelley/Downloads/test_exports/
>
> layers = QgsProject.instance().mapLayers()
>
> for layer_id, layer in layers.items():
> print(layer.name())
> QgsVectorFileWriter.writeAsVectorFormat( layer,  pathToFile+
> layer.name() + ".shp", "utf-8", layer.crs(), driverName="ESRI Shapefile" )
> ```
>
> I see in the manual export options that I can check a box telling the
> export process to use "Use Binary (BLOB)". Image linked below for clarity
> [0]
>
> I haven't yet figured out how to pass that option to writeAsVectorFormat.
>
> any suggestions?
>
> Iv'e had a pretty thorough look through the docs for writeAsVctorFormat,
> is the solution related to
> QgsVectorFileWriter.BoolOption(QgsVectorFileWriter.BoolOption)?
>
>
>
> [0] https://imgur.com/a/9zSMHKq
>
> --
> Hugh Kelley
>
>

-- 
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[Qgis-user] use Binary (Blob) in writeAsVectorFormat

[Hugh Kelley via QGIS-User]

Hi,

I'm attempting to use pyqgis to export a few things to shapefile.

the code below is working well except that a few of the attributes are
incompatible with shapefiles (amazing) lack of a binary datatype.

```py
pathToFile = "C:/Users/hkelley/Downloads/test_exports/

layers = QgsProject.instance().mapLayers()

for layer_id, layer in layers.items():
print(layer.name())
QgsVectorFileWriter.writeAsVectorFormat( layer,  pathToFile+ layer.name()
+ ".shp", "utf-8", layer.crs(), driverName="ESRI Shapefile" )
```

I see in the manual export options that I can check a box telling the
export process to use "Use Binary (BLOB)". Image linked below for clarity
[0]

I haven't yet figured out how to pass that option to writeAsVectorFormat.

any suggestions?

Iv'e had a pretty thorough look through the docs for writeAsVctorFormat, is
the solution related to
QgsVectorFileWriter.BoolOption(QgsVectorFileWriter.BoolOption)?



[0] https://imgur.com/a/9zSMHKq

-- 
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Re: [Qgis-user] Fwd: Your message to Qgis-user awaits moderator approval

[Hugh Kelley via QGIS-User]

 Hi,

(finally found the time/motivation to redo this question)

Wondering if there is a way to label features horizontal relative to the
page with an offset from the feature and callout lines.

Callout lines are simple enough, as is setting labels a certain distance
from the feature. However, this only seems possible when using the
Placement General Settings option "parallel" or "curved".

When I switch to "horizontal", the "distance" option for offsetting the
label disappears, seen in the screen shots below.

Maybe there's a way with the geometry generator or something to accomplish
this? I haven't found an option to set the label orientation explicitly
besides using the move and rotate labels tools.

This is all on 3.22.

Thanks for any suggestions

Hugh


default label options, "parallel" with distance setting option.
https://imgur.com/a/M6gvviZ

horizontal setting without distance option
https://imgur.com/a/eH6aV8D






On Fri, Oct 7, 2022 at 7:33 PM Fernando M. Roxo da Motta via Qgis-user <
qgis-user@lists.osgeo.org> wrote:

> On Fri, 7 Oct 2022 15:58:25 -0600, David Strip via Qgis-user
>  wrote:
>
>
> > your best bet is to upload your screenshots to an image server (eg,
> > Imgur), then inline the images into your email.
>
>   Thanks.
>
> >
> > On 10/7/2022 11:25 AM, Hugh Kelley via Qgis-user wrote:
> > > Hi,
> > >
> > > I included a few screenshots in an email to the list and as a
> > > result it exceeded the acceptable file size. Is this something that
> > > can be approved or should I resend a smaller email?
> > >
> >
> >
>
>
>
>
>
>
>
>
>   Roxo
>
> --
>  Non luctari, ludare ---+ WYSIWYG
> Fernando M. Roxo da Motta   | Editor?
> Except where explicitly stated I speak on my own behalf.|  VI !!
> PU5RXO | PX5Q6048   | I see text,
>  Quis custodiet ipsos custodes?-+ I get text!
>
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Re: [Qgis-user] multiple csv file import

[Hugh Kelley via Qgis-user]

Awesome thanks very much. glad I asked, you learn something new every day.

On Tue, Nov 15, 2022 at 3:19 PM David Strip 
wrote:

> Starting with v2.1, ogr2ogr supports args X_POSSIBLE_NAMES,
> Y_POSSIBLE_NAMES which are strings with allowed wildcards (eg, Lon* ), or
> you can use field_1, field_2, etc to explicitly give the position of
> lat/lon.
> It's explained on the driver page.
>   This StackExchange
> post shows csv to shapefile
> conversion and included Windows command line syntax for looping over files
> in a directory.
>
> On 11/15/2022 12:58 PM, Hugh Kelley wrote:
>
> David, this was my first thought when i saw this question as well.
>
> however, I didn't look for very long but I haven't seen a way to tell
> ogr2ogr to read columns in a csv as the lat/lon and write those as points
> to the shapefile.  I generally write a csv to postgres as a non-spatial
> table and then process the lat lon columns with postgis.
>
>  Are there arguments for ogr2ogr that can do this?
>
>
>

-- 
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Re: [Qgis-user] multiple csv file import

[Hugh Kelley via Qgis-user]

David, this was my first thought when i saw this question as well.

however, I didn't look for very long but I haven't seen a way to tell
ogr2ogr to read columns in a csv as the lat/lon and write those as points
to the shapefile.  I generally write a csv to postgres as a non-spatial
table and then process the lat lon columns with postgis.

 Are there arguments for ogr2ogr that can do this?

On Tue, Nov 15, 2022 at 12:30 PM David Strip via Qgis-user <
qgis-user@lists.osgeo.org> wrote:

> You might consider ogr2ogr as an alternative approach. You can run this
> from the command line allowing you to use shell scripts to iterate through
> all your .csv files. There are also python bindings for ogr2ogr if you're
> more comfortable with python than shell scripts.
>
> On 11/15/2022 9:59 AM, Salvatore Mellino via Qgis-user wrote:
>
> Hello,
>
> thank you for your answer. I have many csv (about 100), so I need an
> automatic procedure. Maybe a python script...
>
> Il 15/11/2022 16:55, Nicolas Cadieux ha scritto:
>
> Hi,
>
> Yes, you can do that very easily using QGIS.  Layer/add layer/add
> delimited text layer.  Then just export the layer in the format of your
> choice. You may need to convert the coordinates in decimal degrees (ex 75
> 05 30.4 -> 75.0917800 ).
>
> You can do this in Excel using =(A6)+(B6/60)+(C6/3600)+(D6/3600) A= Deg,
> B= Min, C=Sec, D= Decimal Sec.  Then export to csv.
>
> Nicolas
>
>
> On 2022-11-15 10:08 a.m., Salvatore Mellino via Qgis-user wrote:
>
> Hello,
>
> I would like to know if it is possible to import multiple csv files
> contained in a folder and to convert them in shapefiles (1 for each csv).
> All csv files are structured as "lat long value" separate by space and
> without any header line.
>
> Thank you for your help! Regards,
>
> Salvatore
>
>
>
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Re: [Qgis-user] graduated symbology classes update

[Hugh Kelley via Qgis-user]

oops here's the image.

https://imgur.com/a/cKBIRSF

On Thu, Oct 20, 2022 at 11:53 AM Hugh Kelley  wrote:

> Hi all,
>
> Just wondering if anyone has a fix for a minor annoyance.
>
> When using graduated symbology, if I want to change the number of classes
> from the default 5 to something else, there's an easy field to update. If
> I'm changing it to a double digit number, or changing a double digit number
> to a different double digit number, the number of classes is updated as
> soon as I make the first key stroke.
>
> for example to turn 10 into 15, QGIS calculates 10 -> 1 -> 15.
>
> I can turn off automatic updating of the map which saves some time, but it
> still needs to calculate the class breaks.
>
> Just wondering whether there's a fix I'm not seeing or whether it's worth
> logging an issue about.
>
> This is on 3.22.
>
> image of the graduated symbology interface in case it clarifies what I'm
> talking about.
>
> thanks
> Hugh
>
>

-- 
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[Qgis-user] graduated symbology classes update

[Hugh Kelley via Qgis-user]

Hi all,

Just wondering if anyone has a fix for a minor annoyance.

When using graduated symbology, if I want to change the number of classes
from the default 5 to something else, there's an easy field to update. If
I'm changing it to a double digit number, or changing a double digit number
to a different double digit number, the number of classes is updated as
soon as I make the first key stroke.

for example to turn 10 into 15, QGIS calculates 10 -> 1 -> 15.

I can turn off automatic updating of the map which saves some time, but it
still needs to calculate the class breaks.

Just wondering whether there's a fix I'm not seeing or whether it's worth
logging an issue about.

This is on 3.22.

image of the graduated symbology interface in case it clarifies what I'm
talking about.

thanks
Hugh
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[Qgis-user] Fwd: Your message to Qgis-user awaits moderator approval

[Hugh Kelley via Qgis-user]

Hi,

I included a few screenshots in an email to the list and as a result it
exceeded the acceptable file size. Is this something that can be approved
or should I resend a smaller email?

-- Forwarded message -
From: 
Date: Wed, Oct 5, 2022, 1:29 PM
Subject: Your message to Qgis-user awaits moderator approval
To: 


Your mail to 'Qgis-user' with the subject

Horizontal Offset Labelling

Is being held until the list moderator can review it for approval.

The reason it is being held:

Message body is too big: 144099 bytes with a limit of 100 KB

Either the message will get posted to the list, or you will receive
notification of the moderator's decision.  If you would like to cancel
this posting, please visit the following URL:


https://lists.osgeo.org/mailman/confirm/qgis-user/8eaf7557da6e01db0b376020fe96b2fc1c668691
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[Qgis-user] Horizontal Offset Labelling

[Hugh Kelley via Qgis-user]

Hi,

Wondering if there is a way to label features horizontal relative to the
page with an offset from the feature and callout lines.

Callout lines are simple enough, as is setting labels a certain distance
from the feature. However, this only seems possible when using the
Placement General Settings option "parallel" or "curved".

When i switch to "horizontal", the "distance" option for offsetting the
label disappears, seen in the screen shots below.

Maybe there's a way with the geometry generator or something to accomplish
this? I haven't found an option to set the label orientation explicitly
besides using the move and rotate labels tools.

This is all on 3.22.

Hugh

[image: image.png]
[image: image.png]
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Re: [Qgis-user] altas page duplication bug?

[Hugh Kelley via Qgis-user]

probably related to this closed issue I suppose

https://github.com/qgis/QGIS/issues/38356



On Wed, May 18, 2022 at 12:13 PM Hugh Kelley  wrote:

> Hi all,
>
> I've been seeing occasionally for at least a few months that when I export
> an atlas, there is sometimes a page duplicated in the resulting pdf.
>
> I haven't been able to isolate the problem at all so haven't filed a bug
> report but wanted to ask if anyone else has seen that.
>
> It hasn't been a huge problem for me but if it's widespread maybe there's
> a fix that could be made.
>
> thanks,
>
> hugh
>
>

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[Qgis-user] altas page duplication bug?

[Hugh Kelley via Qgis-user]

Hi all,

I've been seeing occasionally for at least a few months that when I export
an atlas, there is sometimes a page duplicated in the resulting pdf.

I haven't been able to isolate the problem at all so haven't filed a bug
report but wanted to ask if anyone else has seen that.

It hasn't been a huge problem for me but if it's widespread maybe there's a
fix that could be made.

thanks,

hugh
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Re: [Qgis-user] add strava heatmap to QGIS

[Hugh Kelley via Qgis-user]

worked like a charm! Thanks so much for spending time on this!

Hope you're having a good week

hugh

* In case anyone else is following, i think i missed a url parameter I was
including because of how long it was. The url that I ended up using was

https://heatmap-external-a.strava.com/tiles-auth/all/hot/{z}/{x}/{y}.png?Key-Pair-Id=LONG_STRING=LONGER_STRING

On Wed, May 11, 2022 at 3:12 PM Ujaval Gandhi 
wrote:

> Hi Hugh,
>
> I made it work successfully in QGIS. The URL needs slight tweaking as
> follows
>
>
> https://heatmap-external-a.strava.com/tiles-auth/all/hot/{z}/{x}/{y}.png?Key-Pair-Id=LONG_STRING
>
> Pro Tip: Use View -> Panels -> Debugging /Development Tools to see the
> network request that QGIS is sending out. It helped figure out the correct
> url.
>
>
>
>
> On Fri, May 6, 2022 at 9:22 PM Hugh Kelley via Qgis-user <
> qgis-user@lists.osgeo.org> wrote:
>
>> Hi,
>>
>> I'm hoping to add the strava global heatmap as a tile layer in QGIS.
>>
>> I've done this successfully in the OSM JOSM and ID Editors without a
>> problem. this set of instructions/browser plugin is super helpful.
>> https://github.com/zekefarwell/josm-strava-heatmap
>>
>> without sharing my credentials, the url is just:
>>
>> https://heatmap-external-{switch:a,b,c}.
>> strava.com/tiles-auth/all/hot/{zoom}/{x}/{y}.png?Key-Pair-Id=ID_STRING=VERY_LONG_STRING
>> <http://strava.com/tiles-auth/all/hot/%7Bzoom%7D/%7Bx%7D/%7By%7D.png?Key-Pair-Id=ID_STRING=VERY_LONG_STRING>
>>
>>
>> It seems that I should be able to plug the same url into the QGIS  as an
>> xyz layer, but when I do it doesn't work. There's no error or warning, just
>> a blank map window. I tried including my strava login in the credentials
>> section but this didn't do anything and isn't necessary in the JOSM or ID
>> editors.
>>
>> Just wondering if anyone can think of any further fixes to try or has
>> successfully done this themselves. The heatmap api has changed a bit in the
>> past couple years so what worked in the past may not work correctly today.
>>
>> Thanks!
>>
>> Hugh
>>
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[Qgis-user] add strava heatmap to QGIS

[Hugh Kelley via Qgis-user]

Hi,

I'm hoping to add the strava global heatmap as a tile layer in QGIS.

I've done this successfully in the OSM JOSM and ID Editors without a
problem. this set of instructions/browser plugin is super helpful.
https://github.com/zekefarwell/josm-strava-heatmap

without sharing my credentials, the url is just:

https://heatmap-external-{switch:a,b,c}.
strava.com/tiles-auth/all/hot/{zoom}/{x}/{y}.png?Key-Pair-Id=ID_STRING=VERY_LONG_STRING


It seems that I should be able to plug the same url into the QGIS  as an
xyz layer, but when I do it doesn't work. There's no error or warning, just
a blank map window. I tried including my strava login in the credentials
section but this didn't do anything and isn't necessary in the JOSM or ID
editors.

Just wondering if anyone can think of any further fixes to try or has
successfully done this themselves. The heatmap api has changed a bit in the
past couple years so what worked in the past may not work correctly today.

Thanks!

Hugh
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Re: [Qgis-user] WG: drop down Vektor not opening

[Hugh Kelley via Qgis-user]

Hi Michael,

Just a guess, but check in plugins >> manage and install plugins, whether
the "processing" plugin is installed and activated by checking the box next
to the plugin name.

I'm not sure why but occasionally on fresh installs the processing plugin
is not checked on by default. That provides the majority of vector tools.

On Thu, Mar 17, 2022, 8:59 AM Lengenfelder, Michael via Qgis-user <
qgis-user@lists.osgeo.org> wrote:

> Dear community,
>
>
>
> I have a problem since 2 days, the menü ‘Vektor’ doesn´t open anymore. I
> reinstalles the software, but no help.
>
> It´s 3.16.9 ‘Hannover’
>
>
>
> thanks for help
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