from:"Wolfgang Meinolf"

Re: [Qgis-user] QGIS and geopackages in sharepoint environement

2022-08-11 Thread Wolfgang Meinolf via Qgis-user

Hi,
we use Sharepoint extensively. Here my 2 comments:


  1.  Even when a Project is entirely on Sharepoint with all i.e. GPKG, you can 
work with it without restrictions (except speed)
  2.  Due to the filesize of some ressources as for example Geopackages you run 
risk, that Sharepoint files get out of sync. Specifically when Team works on 
the project.

Therefore my recommendation: Move project to local drive, work with it and, 
when finished, move back to sharepoint dir.

Cheers
Wolfgang

Von: Qgis-user  Im Auftrag von John Layt via 
Qgis-user
Gesendet: Montag, 8. August 2022 11:03
An: Sebastian Gutwein 
Cc: qgis-user@lists.osgeo.org
Betreff: Re: [Qgis-user] QGIS and geopackages in sharepoint environement

Hi,

We use Google Drive on Macs for shapefile and GeoPackages. The first thing we 
always tell our users is to set the files to Available Offline, so all 
reads/writes are local before being synced up to the cloud. That reduces 
issues, but all the obvious ones around file corruption and overwriting still 
apply. As mentioned, GDAL/QGIS did use to always write the lockfile inside 
whenever anyone opened a geopackage, which would cause the file to sync back to 
the cloud and flood your bandwidth, which is a real pain. That has changed, but 
it doesn't solve the multiple-users overwriting issue though. My long-term 
solution was going to be building a proper geospatial infrastructure with 
MerginMaps and PostGIS so people 'check-out' the geopackages they needed, then 
merged them back in. Sadly we've just been sold to an ESRI-using company, so 
that will never happen, however they do use Sharepoint so maybe I'll find out 
if that's any better than Drive in my near future.

Cheers!

John.



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Re: [Qgis-user] Offline background map for large regions

2022-07-11 Thread Wolfgang Meinolf via Qgis-user

Hi you might think about a local Maptile Server running on a VM on your PC. 
That's what I have for meetings, where I am offline. However for disk space 
reason I limited the Map to Germany and it's still very slow. The VM is 
internally networked with the PC so it like a local "internet" connection.


-Ursprüngliche Nachricht-
Von: Qgis-user  Im Auftrag von Andreas via 
Qgis-user
Gesendet: Sonntag, 10. Juli 2022 10:58
An: qgis-user@lists.osgeo.org
Betreff: [Qgis-user] Offline background map for large regions


Hello!

First I have to say that I'm a qgis beginner and I'm not very much into the 
concepts about functions and design behind QGIS, and GIS in general.
So please apologize for any strange question...


Currently I have an older core i7 with 8 GB RAM running QGIS Desktop
3.10 on Linux Mint 20.3, which I know is already obsolete but it's in the 
repositories of this most recent Linux Mint LTS version, and I need a stable 
system that does not break due to a library update etc.


I want to visualize data points, that I collect "on the road" over large 
distances, on the fly. So far so good everything works very fine, opening the 
data log file in a text layer with surveillance of log changes. Except having 
an offline background map for orientation. There is not always internet 
connection, and also it would be quite expensive to continuously download the 
tiles from a server over LTE.



Up to now I tried using shapefiles from geofabrik.de, but even importing a 
small town takes minutes.

Also the plugins for downloading xyz tiles will not work, as I need whole 
europe offline available in the best case, at least a whole country.

Then I imported a .osm file in a spatialite database but there are thousands of 
attributes I have to chose from, not knowing which ones, and also I cannot 
import more than a small region due to the insane time it takes.

The last thing I tried was a download of Germany vector tiles from 
maptiler.com, about 3,5 GB. When I drag and drop it into QGIS, it loads for 
hours without coming to an end, there is no information about what the software 
is doing (progress bar) or a button to stop the import, so I finally killed the 
QGIS process.

I was also looking for GeoPackage maps, as they seemed to have an index and 
mbtiles not (which may be what causes the described problems), but did not find 
any resources on the net except from a site that provides the whole planet 
earth (which is way too much for me).

Yesterday I tried to setup a QGIS Server to set up a WMTS service on the same 
machine, but I failed on finding out how to make map data available on the 
server (I have to provide a QGIS project file but as I already wrote, I was not 
even able to import a simple all-germany map).


So, finally, there must be something I'm missing or I don't understand.
If you have a smartphone or a Garmin GPS, you can easily download a map for 
whole germany that is about 2 GB, that can be imported in a few seconds, then 
accessed very performant by slow processors with tiny available memory. I also 
don't see why it should be necessary to go via a WMTS Server (http) to provide 
map data in a way QGIS can them handle with performance - how is the server 
getting its high performance, and why QGIS can't do it on it's own? Or can it - 
how??


Any hints about how I can get large area offline maps into QGIS are highly 
appreciated - thank you very much in advance!

Andreas







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Re: [Qgis-user] [SPAM] Re: Own processing scripts doesn't load into processing toolbox since QGIS update to 3.22.8.

2022-06-29 Thread Wolfgang Meinolf via Qgis-user

Thanks Andrea,
you won't believe it. I ran setup to figure out the versions for you in my mail
below. When I clicked the finish button something was unexpectedly installed. I
just realized, that I see now all my scripts back in qgis. So it's possible,
that Fiona was updated. I use normally the norbit.de mirror, as it's the
fastest from here.

However I found now another effect, that produces the following:
"2022-06-29T18:05:19 CRITICALKonnte Layer
ogr:dbname='C:/Users/WMeinolf/WmLocal/LocalTempDir\220620 Check Alg6.1.gpkg'
table="Hauspunkte-Test" (geom) nicht erzeugen: OGR-Treiber für '' nicht
gefunden (OGR-Fehler: )"

It seems to happen, of the qgs filename contains a . When I rename "220620
Check Alg6.1.qgs" to "220620 Check Alg61.qgs", the error is gone. But this
needs some further tects on my side. I had in the past some similar issues with
German Special characters (äöüß) in filename or path

Anyway, I am more than happy, that it seems to work again. Thanks for your
help!!

Cheers and enjoy the evening
Wolfgang

Von: Andrea Giudiceandrea
Gesendet: Mittwoch, 29. Juni 2022 17:00
An: Wolfgang Meinolf ; qgis-user@lists.osgeo.org
Betreff: Re: AW: [SPAM] Re: [Qgis-user] Own processing scripts doesn't load
into processing toolbox since QGIS update to 3.22.8.

Il 29/06/2022 12:06, Wolfgang Meinolf ha scritto:

Thanks for your help. I hope it works with the attached zip. Btw, in OSGeo4W
Setup we additionally install geopandas, where I am on 0.8.1-2, and rtree
(0.9.4-1) and confirm to install all dependencies. I'm on Win10, installed to
C:\OSGeo4W

Hi Wolfgang,
I've installed python3-fiona-1.8.21-1, python3-geopandas-0.8.1-2 and
python3-rtree-0.9.4-1 and I cannot see any error after putting the two script
in the "scripts" folder and launching QGIS 3.26.0: it is then possible to open
the algorithms GUI as you can see from this screenshot

https://drive.google.com/file/d/1vbarOQvjya28bU6Qs1CBSe1aEfpCNQ8l/view<https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdrive.google.com%2Ffile%2Fd%2F1vbarOQvjya28bU6Qs1CBSe1aEfpCNQ8l%2Fview=05%7C01%7Cwmeinolf%40bbv-deutschland.de%7C39cc958c76dc4e197ba808da59e014a1%7Cba47bf4371d541d1a485dbbab42b8852%7C0%7C0%7C637921116196798951%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C=C98p%2Bq4Fu6Ymx89xOMDSwnLp1d99KR%2FM7qrL%2Bl3MeFQ%3D=0>

Maybe you have a not up to date fiona package?

Best regards.

Andrea

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[Qgis-user] Own processing scripts doesn't load into processing toolbox since QGIS update to 3.22.8.

2022-06-28 Thread Wolfgang Meinolf via Qgis-user

Hi,
Yesterday I updated my QGIS from 3.22.7 to 3.22.8. Since I have the issue, that 
two of my processing scripts don't load. As reason the log shows critical 
messages:

2022-06-28T17:02:03 CRITICALKonnte Skriptalgorithmus 
xx.py' importieren [Translates: Could import 
Scriptalgorithmus. I think, it means Could NOT import script alg]
 DLL load failed while importing ogrext: Das angegebene Modul wurde 
nicht gefunden. [Translates: module not found]
2022-06-28T17:02:03 CRITICALKonnte Skriptalgorithmus y.py' 
importieren
 partially initialized module 'fiona' has no attribute '_loading' 
(most likely due to a circular import)


I found some older cases in the web where this was caused due to different 
versions of python library or wrong path to py libs.

Has anyone else observed such effect? If not I tend to open a case.

Thanks and best regards form bavaria


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Re: [Qgis-user] Windows 11

2022-03-04 Thread Wolfgang Meinolf via Qgis-user

Yes, me. Works perfectly!

Von: Qgis-user  Im Auftrag von Grant Boxer 
via Qgis-user
Gesendet: Freitag, 4. März 2022 06:03
An: qgis-user@lists.osgeo.org
Betreff: [Qgis-user] Windows 11

I have a client who is running QGIS under Windows 11 and is having all sorts of 
stability problems and has gone back to version 3.4. Has anyone used QGIS with 
Windows 11?

Grant Boxer, Perth WA



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Re: [Qgis-user] Rolling out pre-configured QGIS for multiple users - MSI package, user profiles and more

2022-02-11 Thread Wolfgang Meinolf

N¬Æ§Kó0K"wë,jµÓ¶®9ôtó<-Ð
9a÷¯¢í©âjÊ+¶§«í©âjÊ+¶§« ª+.±êåËl¢È¢àª¬ºÇ«+-² z++ç-d 
Ë¬z´hX§¦·¢wâêÞuIú+ém^ºÇ«°Ä¥§$j®±êé®âëÙ¨àÚµák]Ey½´ÛmvÓ]}ûM4Ð*'µéí-©à¹¨uàÄ
íz{SÊ{¦V¢ÈZ®Ç___
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Re: [Qgis-user] Installing downloaded plugins (OSGeo4W install-download)

2022-02-11 Thread Wolfgang Meinolf

Hi Mike,
I can ensure you I installed QGIS on various PCs (Win10 and WIN11) within less 
than 90mins using latest OSGeo4W installer having 50mBit/s Downstream 10Mbit/s 
Upstream and from local German norbit.de mirror. From osgeo.org it takes about 
2hrs. Same on Win7 but a while ago. Having enough bandwith is the key.

Br from Bavaria
Wolfgang


Von: Qgis-user  Im Auftrag von Mike Breiding 
- Morgantown WV
Gesendet: Donnerstag, 10. Februar 2022 00:57
An: Andrea Giudiceandrea ; Qgis 

Betreff: Re: [Qgis-user] Installing downloaded plugins (OSGeo4W 
install-download)

Greetings,

After 15 hours of download/installing and 4 error messages the process is 
finished.
There were 7 shortcuts installed on my desktop but I cannot find the executable 
to start the program.
I also checked the install directory but cannot find a way to launch the 
program.
What a waste of time and all because I missed the QGIS 3.22.3 warning about Win 
7 incompatibility.

OSGeo4W install-download error messages:
https://photos.app.goo.gl/FGEserH92BNmu9Cr6

It's back to ArcView 3.2 for me!

WV-Mike
===

On 2/8/2022 2:25 PM, Andrea Giudiceandrea wrote:
AFAIK, if you need to use QGIS on Windows 7, you could use QGIS 3.16.16 
installing it via the old OSGeo4W Network Installer (v1) or the OSGeo4W 
Standalone Installer (.exe).

Regards.

Andrea

[1] https://qgis.org/en/site/forusers/download.html



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Re: [Qgis-user] Help converting State

2022-01-26 Thread Wolfgang Meinolf

Hi,
as an alternative you can update the existing coordinate attributes following 
to reprojection also with $x and $y, which updates the existing coordinates 
according to the new CRS.

Best regards from Bavaria
Wolfgang

Von: Qgis-user  Im Auftrag von Bighouse 
Productions
Gesendet: Dienstag, 25. Januar 2022 18:34
An: Andrea Giudiceandrea 
Cc: qgis-user 
Betreff: Re: [Qgis-user] Help converting State

Thanks Andrea! GEOMETRY: AS_XY  - that did the trick for me. That was a long 24 
hours trying to figure it out :-)

You rock! Thanks a lot.
D.

Doug Hadfield,
bighouseproductions.ca
VRtuous.com
virtualvideoproductions.com
Video, Animation, Photography, 3D & VR
778 895 1755
Demo Reel: https://vimeo.com/183084451
Photography: bighouse.smugmug.com



On Tue, Jan 25, 2022 at 4:16 AM Andrea Giudiceandrea 
mailto:andreaer...@libero.it>> wrote:

Bighouse 
Productions
 Mon, 24 Jan 2022 18:37:41 
-0800

Hi Chris et al. here's a video showing the steps I'm following -- can

someone pinpoint what I'm doing wrong?

https://vimeo.com/669657507/e84405ce12
Hi Doug,
If I understand correctly your "issue" looking at the video, there is probably 
a misunderstanding about how csv / vector layers / reprojection work.

A GIS vector layer stores information about the features geometries (the 
coordinates of each point or vertex) and the features alphanumeric attributes 
(the fields and their values).

A csv file stores alphanumeric attributes.

When you import the csv file in QGIS , since some fields contain values 
representing the coordinates of a point,  it becomes a vector layer in which 
the features geometries are created, on importing, from the values (the 
coordinates) contained in such fields and the features attributes are the same 
attributes stored in the csv file.

Reprojecting a vector layer from a CRS to another one only changes the features 
geometries and not the features attributes.

Exporting a vector layer (with default options) to a csv file only saves its 
alphanumeric attributes.

Does this make sense to you?

Do you need to transform the coordinates values relative to a CRS stored in the 
EAST and NORTH fields of your csv file to the coordinates values relative to 
another CRS and update your EAST and NORTH fields or add new fields with the 
new values and save it as another csv file?

There various ways to obtain the some result.

For example:
- you can select the GEOMETRY: AS_XY layer option in order to add X an Y fields 
to the exported CSV in which the coordinates values are stored relative to the 
CRS set in the CRT option.
- or you can reproject the layer (Processing tool: "Reproject layer") and than 
use the Field Calculator to add new field or updated the EAST and NORTH fields 
with the new coordinates of the points and then save the layer to a CSV file 
with the default options.
- or you can use the Processing tool "Add X/Y fields to layer" to add X and Y 
fields with the coordinates values relative to the desired CRS and then save 
the layer to a CSV file with the default options.

Regards.

Andrea Giudiceandrea
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[Qgis-user] Installations issues Geopandas / Fiona libraries

2022-01-18 Thread Wolfgang Meinolf

Hi,
we developed some processing scripts, which use additional Python libraries, 
one of them is geopandas, which needs Fiona as prerequisite. Now we installed a 
fresh pc from scratch and found, that our scripts show errors (or don't even 
appear in the processing tool box). Investigations came to the result, that 
geopandas and Fiona are obviously installed but can't be imported into QGIS.

As we installed the last pc late November, everything was ok. All installations 
are done with latest OSGeo4W installers.

Here my question:

Did anyone observed similar issues, possibly with other librarys or has anyone 
a solution, how to fix that.

Thanks an best regards from Bavaria
Wolfgang


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[Qgis-user] Changing Scripts folder location programmatically

2021-12-13 Thread Wolfgang Meinolf

Hi,
I like to implement a centrally controlled QGIS environment for our workforce 
using startup.py. Thanks to the list for the very helpful feedback to my 
previous mails. In startup.py we also like to define and modify some variables 
containing path to i.e. scripts and models directories. We found the variable 
names SCRIPTS_FOLDERS and MODEL_FOLDER (Btw, why is it SCRIPTS_FOLDERS but 
MODEL_FOLDER)

Now: I tried to modify the value using 
processing.ProcessingConfig.getSetting('SCRIPTS_FOLDERS') and 
processing.ProcessingConfig.setSettingValue(...)  via console. It works 
perfectly.

When I put this in startup.py, unfortunately it does not work at all. 
Interestingly, to define a context variable 
QgsExpressionContextUtils.setGlobalVariable works in both, consol and script.

Any help is appreciated.

Best regards
Wolfgang


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Re: [Qgis-user] startup.py on network folder

2021-12-06 Thread Wolfgang Meinolf

Hi Stefan,
thks for the fast response. That’s something, I can build on.
Br
Wolfgang

Von: Stefan Giese (WhereGroup) 
Gesendet: Montag, 6. Dezember 2021 17:35
An: Wolfgang Meinolf ; qgis-user 

Betreff: Re: [Qgis-user] startup.py on network folder


Hi Wolfgang,

you can start QGIS with a command line option --code followed by the path and 
scriptname, for example in a BAT file

Best regards

stefan
Am 06.12.2021 um 17:31 schrieb Wolfgang Meinolf:
Hi,
I like to implement a centrally controlled QGIS environment for our workforce 
using startup.py. Is there any trick, to put startup.py on a network folder 
instead the user’s QGIS folder i.e. under Windows 
%user%\AppData\Roaming\QGIS\QGIS3?

PYQGIS_STARTUP environment variable to change the location does unfortunately 
not work.

Thanks
Wolfgang



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[Qgis-user] startup.py on network folder

2021-12-06 Thread Wolfgang Meinolf

Hi,
I like to implement a centrally controlled QGIS environment for our workforce 
using startup.py. Is there any trick, to put startup.py on a network folder 
instead the user’s QGIS folder i.e. under Windows 
%user%\AppData\Roaming\QGIS\QGIS3?

PYQGIS_STARTUP environment variable to change the location does unfortunately 
not work.

Thanks
Wolfgang


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Re: [Qgis-user] Does DWG work in 3.22? - RE: importing dwg/dxf

2021-11-29 Thread Wolfgang Meinolf

Hi,
I gave up to import DWG directly. I always convert them with ODA File Converter 
20.8.0 to 2018 ASCII DXF, which I then import using QGIS DWG/DXF import 
feature. Only problem ism that large DXF i.e. including ALKIS Layers take ages 
for the import. In this case I drag the DXF into qgis and filter the 
required Layers manually. In this case unfortunately the symbology is gone. All 
DWG are customer provided, I have no ACAD available.

Best regards
Wolfgang

Von: Qgis-user  Im Auftrag von Nicolas 
Cadieux
Gesendet: Montag, 22. November 2021 18:55
An: Jeff Sonnentag ; Bernd Vogelgesang 
; Greg Troxel ; Boaz Bar Ilan 

Cc: qgis-user 
Betreff: Re: [Qgis-user] Does DWG work in 3.22? - RE: importing dwg/dxf


Hi,

The GDAL/ORG library works with Open Design Alliance Teigha library. They have 
a support for R13-15, R2004, R2007, R2010, R2013 and R2018 but since Autocad is 
a closed format, then all of this is basically the result of  reversed 
engineering.  DXF is an open format so that is easier to deal with.

I believe that the drag and drop functions for DWG and DXF uses the libopencad 
drivers (and that is limited to r2000 or ACAD1015)) (at least in QGIS 3.20) so 
if you did drag and drop a correct file format, then the DWG worked.


It's my personal experience that anything past R15 (2000) will be buggy in QGIS 
but you can also open those files using the project > import/export > import 
layer from DWG/DXF. For some reasons, some DWG files cannot be dragged and 
dropped but can be imported via the project import function. This has the 
advantage of keeping the Autocad styling. I guess this function probably uses 
the Open Design Alliance Teigha library and not the libopencad drivers as it 
will open files that I cannot drag and drop???  Looks like those functions are 
not available via the python API nor the Processing toolbox either:(


Anyways, when that fails (about 50% of the time on very big files), I save the 
DWG to DXF and that either fixes the file or makes it more compatible with the 
driver.  IMHO, Exporting dwg to shp file is the only real interesting feature 
of AutoCAD Map3D.  The last version I regularily worked with has probably 
2013-15 so maybe they have updated the product since.


https://knowledge.autodesk.com/support/autocad/learn-explore/caas/sfdcarticles/sfdcarticles/AutoCAD-drawing-file-format.html

https://docs.qgis.org/3.22/en/docs/user_manual/managing_data_source/opening_data.html?highlight=dwg#importing-a-dxf-or-dwg-file

Nicolas
On 2021-11-21 11:06 p.m., Jeff Sonnentag wrote:
Somebody must get the same quality of “engineering” that we do here.  :D

The last item received was in feet and aligns with California State Plane Zone 
6, but they chopped off the first digit of both “X” and “Y” for everything.  
Who knows why.  Maybe things run faster for them with 6 digit coordinates 
rather than 7 digit ones like you mentioned.  (???)

Anyway, when I tried the simple drag and drop into QGIS 3.22 it never worked.  
Always an error message about invalid data, even after I used DWG Trueview to 
convert it to the oldest possible versions (97/98 and 2000).  I did manage to 
get it in AFTER converting the DWG to a DXF with an online conversion site.  
That DXF could be drug (I hate the word “dragged” – seems along the lines of 
“runned”) into QGIS and appeared OK.  Export to a shapefile and then do some 
affine adjustment magic and things can be worked with.

Is there a reason that a DWG can’t be dropped into QGIS 3.22 but a DXF can?  
Are there some DWG versions that just don’t work?  I thought I got a DWG to 
appear OK in 3.16, but maybe I just imagined it and used a DXF before too. . . .


From: Qgis-user 
 
On Behalf Of Bernd Vogelgesang
Sent: Sunday, November 21, 2021 10:53 AM
To: Nicolas Cadieux 
; Greg Troxel 
; Boaz Bar Ilan 

Cc: qgis-user 
Subject: Re: [Qgis-user] importing dwg/dxf


On 21.11.21 15:35, Nicolas Cadieux wrote:
Hi,

.dwg or dxf have no CRS.  They can be in inches, feet, mm, cm, m... Usually 
meter in a local CRS like a local WGS84 UTM ZONE is used.  You can usually find 
this in the metadata if available.

Nicolas

I have no deep technical insight into dwg or dxf, but I am pretty sure that 
those  CAD-"products" are able to be produced with valid coordinates, fitting 
to a common CRS. Most people using CAD-systems simply seem to be either too 
stupid for that, or just do not care.

One of the reasons, CAD-"data" is produced with a local reference system 
instead with a normal CRS is, according to an CAD-operator I once asked about 
this, that some CAD-systems just slow down to in-operability when using 
real-world coordinates because of the huge numbers, compared to the small 
coordinates in their own system.

So, I would not even try to fix this, but instead ask those guys to stop 
scratching their

[Qgis-user] Downgrade with OSGeo4W Installer Windows 10

2021-11-18 Thread Wolfgang Meinolf

Hi, since I upgraded Sunday night to 3.22.0-4 (or was it -3), I encounter 
serious problems with existing and new projects. Upgrade to currently 3.22.0-4 
was not helpful. I installed from scratch various times with and without new 
profiles. Working a lot with processing scripts also using plugins like i.e. 
QUICKOSM. Also I have the feeling, that the current release does not detect CRS 
in existing GPKG Layers. To open these worked like a charm until Sunday night 
with the older release.

Is there any process to downgrade using OSGeo4W Installer to an older Release 
than just the previous one? I don't like to start with stand alone installers.

Thanks for any comment and recommendation.

Best Regards
Wolfgang



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Re: [Qgis-user] k-means constrained

2021-10-21 Thread Wolfgang Meinolf

Hi and thanks for the info. I’ll try. Forget to ask, does it just cluster 
considering euclidian distance, or can I also use a road network for real 
distance?

Von: Ujaval Gandhi 
Gesendet: Donnerstag, 21. Oktober 2021 20:04
An: Wolfgang Meinolf 
Cc: qgis-user@lists.osgeo.org
Betreff: Re: [Qgis-user] k-means constrained

I wrote a QGIS processing alg for constrained k-means based on another library. 
You can check it out at 
https://spatialthoughts.com/2021/01/31/equal-sized-kmeans-qgis/

[Logo]<https://spatialthoughts.com/>
Ujaval Gandhi
Spatial Thoughts
mobile: +91-8095684687
email: uja...@spatialthoughts.com<mailto:uja...@spatialthoughts.com>
[LinkedIn icon]<https://www.linkedin.com/in/spatialthoughts/>  [Twitter icon] 
<https://twitter.com/spatialthoughts>



On Thu, Oct 21, 2021 at 10:53 PM Wolfgang Meinolf 
mailto:wmein...@bbv-deutschland.de>> wrote:
Hi,
I need to use the https://github.com/joshlk/k-means-constrained in QGIS. 
Unfortunately this lib in not listed in the OSGeo4W installer. As I don’t like 
to install it separately on windows here my question:

Is there any comparable processing alg or Plugin available in QGIS, which I can 
Installviy QGIS Installer and use inside processing scripts?

Thanks and regards
Wolfgang
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[Qgis-user] k-means constrained

2021-10-21 Thread Wolfgang Meinolf

Hi,
I need to use the https://github.com/joshlk/k-means-constrained in QGIS. 
Unfortunately this lib in not listed in the OSGeo4W installer. As I don't like 
to install it separately on windows here my question:

Is there any comparable processing alg or Plugin available in QGIS, which I can 
Installviy QGIS Installer and use inside processing scripts?

Thanks and regards
Wolfgang


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Re: [Qgis-user] FW: Couldn't load SIP module - Windows 10

2021-10-03 Thread Wolfgang Meinolf

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[Qgis-user] Access attributes of temp "layer" before loading into qgis

2021-09-14 Thread Wolfgang Meinolf

Hi,
In my scripts I work intensively with processing algs. In the script the 
processing algs  “OUTPUT” is set to QgsProcessing.TEMPORARY_OUTPUT. The result 
is written to i.e. outputs [ResultFirststAlg]. When I like to feed the result 
in the next alg inside the same script, I set “INPUT” of the following alg to 
outputs [ResultFirststAlg] [OUTPUT]. So far so good.

Now, I like to change some attributes in the Layer, which is at outputs 
[ResultFirststAlg] [OUTPUT]. I can do this  with the field calculator, however 
the results are then stored in a new layer, i.e. outputs [FieldCalc] [OUTPUT].

Currently I load the layer into qgis by using loadlayer alg at the end of the 
first script. Then I start a new script, which address the layer via Layer = 
QgsProject.instance().mapLayersByName(‘Loaded Layer from first script’), 
calculate the index by LayerIndex = Layer [0] or the Name for algs as LayerName 
= LayerIndex.name().

Now, when I consolidate the scripts, I cannot select by layername, as the 
loadlayer seems to be processed at the end of the script.

Is there any way, to modify attribute values directly in the initial layer at  
outputs [ResultFirststAlg] [OUTPUT]?

Thanks in advance
Wolfgang





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Re: [Qgis-user] Equal Size Spatial Clusters

2021-08-04 Thread Wolfgang Meinolf

Hi, to my knowledge this is the only implementation as of todate:
https://elki-project.github.io/tutorial/same-size_k_means

Not sure, if it is good enough for a production area.

Von: Qgis-user  Im Auftrag von chris 
hermansen
Gesendet: Montag, 2. August 2021 21:25
An: krishna Ayyala 
Cc: qgis-user 
Betreff: Re: [Qgis-user] Equal Size Spatial Clusters

Krishna and list
On Mon, Aug 2, 2021, 11:39 krishna Ayyala 
mailto:ayyalakris...@gmail.com>> wrote:
Hello,
I have a point shapefile with 27,000 points. How to generate 3 spatial clusters 
such that each cluster has 9000 points.


This is a nice article that explores this problem.

http://jmonlong.github.io/Hippocamplus/2018/06/09/cluster-same-size/


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Re: [Qgis-user] Single lines for road network

2021-08-01 Thread Wolfgang Meinolf

Sure. Explode and snap the network, check for duplicates, merge the lines and 
split with lines with itself. For FTTH approach (should this be relatesd to 
your previous question) I would not recommend to design anything based on 
centerlined of roads. For a professional FTTH planning you need to plan nest 
routes on both sindes of the road.  Like here:

[cid:image005.jpg@01D786EA.F8398F30]

Cheers

Von: Qgis-user  Im Auftrag von krishna Ayyala
Gesendet: Samstag, 31. Juli 2021 02:58
An: qgis-user 
Betreff: [Qgis-user] Single lines for road network

Hello,
I have a huge road network that has double lines such as below. We see such 
roads mostly for express highways.
[cid:image006.png@01D786EA.F8398F30]
In the same road network, there are also some streets with single lines such as 
below.

[cid:image007.png@01D786EA.F8398F30]

Is it possible to convert the entire road network such that we have only single 
lines and not double lines such as above. Since the road network is huge, it 
may not be possible to select manually each segment and run the tools. Is there 
an automated tool that can do this for the entire network?

Regards.


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

2021-07-01 Thread Wolfgang Meinolf

Hi,
I get good results with following processing alg workflow:

  *   Explode objects with explodelines
  *   Check and remove duplicates with deleteduplicategeometries
  *   Remove remaining empty objects with removenullgeometries
  *   Merge all into single feature with dissolve
  *   Split in most simple features with splitwithlines, use dissolved layer as 
input and lines for splitwithlines
  *   Finally I apply createspatialindex To accelerate the following steps.

I use this as “cleaning” step in my FTTH scripts to clean layers before I 
calculate $length and to use resulting line layer as “road”-network to connect 
points with lines.

Greetings from Germany

Von: Qgis-user  Im Auftrag von Nicolas 
Cadieux
Gesendet: Mittwoch, 30. Juni 2021 21:49
An: krishna Ayyala 
Cc: qgis-user 
Betreff: Re: [Qgis-user] How to convert multiple features to single Feature - 
Shape file

Hi,

Multipart to single part will only split multipart object if they exist.  In 
your case, you have no multipart objects.  What you appear to have is multiple 
line on top of each other. (Overlapping lines.  That is probably because you 
did a all-to all shortest path analysis.  Therefore, you have multiple paths 
overlapping others.
Nicolas Cadieux
https://gitlab.com/njacadieux


Le 30 juin 2021 à 15:34, krishna Ayyala 
mailto:ayyalakris...@gmail.com>> a écrit :

Tiago,
Thanks for your reply. Actually my shapefile is a polyLine. It is not a 
polygon. My polyline shape file had about 6000 lines. When I ran 'multiparts to 
single parts" It resulted in a shapefile which also had 6000 lines. I was 
hoping it to be simplified to 30 or 40 lines but that did not happen.

Regards.

On Tue, Jun 29, 2021 at 8:56 PM 
mailto:tiago.moraessi...@hotmail.com>> wrote:
Good evenning.

 In the tool box have e toll (multiparts to single parts). Will go break those 
multiples polygons in single parts.

I hope help you e sorry my bad English.

Regards

Em 29 de jun. de 2021 22:06, krishna Ayyala 
mailto:ayyalakris...@gmail.com>> escreveu:
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] Is QGIS suitable for...

2021-04-17 Thread Wolfgang Meinolf

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Re: [Qgis-user] Qgis low CPU and Memory load

2021-04-16 Thread Wolfgang Meinolf

Thanks for the excellent feedback and hints. First of all, my QGIS qork is
mainly with vector layers. Therefore unfortunately the OpenCL capabilities
don’t help. To my understanding this is mainly for accelerating heavy raster
calculations. Secondly and as already mentioned, my most urgent need is to
accelerate the execution of GRASS v.net.steiner and v.clean as part of my
toolbox processing scripts for a number of given route networks in separate
areas.

However, on you feedback I searched a bit and found, that obviously since
QGIS3 some parallelization seems to be supported. In the developers coockbook
here:
https://docs.qgis.org/testing/en/docs/pyqgis_developer_cookbook/tasks.html#task-from-a-processing-algorithm
I found some promising info including the link to here:
https://www.opengis.ch/2018/06/22/threads-in-pyqgis3/. I will spend some time
to modify my loop through my separate network areas to try, to start python
jobs from inside the loop, which are then collected at the end.

Thanks again for your good ideas and have a good weekend
Br
Wolfgang
-

Hi,

You can also activate the OpenCL option. Some algorithms have been optimized
(I believe it’s still experimental). If you have a compatible OpenCL video
card, it will run these on the card. If not, it can probably run on compatible
CPUs.

https://www.itopen.it/opencl-acceleration-now-available-in-qgis/

I find it’s worth testing equivalent algorithms from different sources in the
Processing plugin is worth the trouble. Some Saga algorithm are faster.
Merging vector lines, for example, could take a long time using the QGIS
algorithm (talking hours) and was much faster (a few minutes) using the Saga
version of the tool. I also found that some algorithms are much faster to
handle when the files are not open beforehand in the layer manager. For
example, the Processing plugin can sometimes grab the needed files directly on
the hard drive rather than picking one that is already open in the layer
manager. Looking at the processor, memory and disk usage can also help identify
bottle necks in the hardware.
Nicolas Cadieux
https://gitlab.com/njacadieux

Le 16 avr. 2021 à 03:34, Francesco Pelullo
mailto:f.pelu...@gmail.com>> a écrit :

Il ven 16 apr 2021, 02:56 Stewart Holt
mailto:stewartbh...@gmail.com>> 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] Qgis low CPU and Memory load

2021-04-15 Thread Wolfgang Meinolf

Dear Community,
I use Qgis quite a while under win10 and ubuntu (via Oracle VM Box). My FTTH 
scripts include GRASS i.e. v.net.steiner algorithm, which are quite CPU and 
memory intensive. However I never observed more than 30% CPU and never more 
than appx 4GB mem usage. My Hardware is Intel I7, 32GB Ram and 1000TB SSD. At 
same time I don't observe any other activities i.e. on network. I installed 
OsGEO4W the 64bit Version. I'. currently on 3.18.1

I have however the impression to use a 32bit version.

I would appreciate any hint, how I can increase the CPU and MEM Load, to 
accelerate my scripts, which run usually quite a while. What do I wrong?

Thanks in advance and best regards from Bavaria.
Wolfgang



QGIS-Version

3.18.1-Zürich

QGIS-Codeversion

202f1bf7e5

Kompiliert gegen Qt

5.11.2

Laufendes Qt

5.11.2

Kompiliert mit GDAL/OGR

3.1.4

Läuft mit GDAL/OGR

3.1.4

Kompiliert mit GEOS

3.8.1-CAPI-1.13.3

Läuft mit GEOS

3.8.1-CAPI-1.13.3

Kompiliert mit SQLite

3.29.0

Läuft mit SQLite

3.29.0

PostgreSQL-Client-Version

11.5

SpatiaLite-Version

4.3.0

QWT-Version

6.1.3

QScintilla2-Version

2.10.8

Kompiliert mit PROJ

6.3.2

Läuft mit PROJ

Rel. 6.3.2, May 1st, 2020

BS-Version

Windows 10 (10.0)

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Re: [Qgis-user] WebGIS - LizMap