[Qgis-user] loading geologic symbol library

[Firstname Lastname]

i have download a geologic symbol library from Rod Holcolme, a geology prof
in australia.  i have set up the path for the files via the
Options>system>.svg path.
this seems to have linked to the directory, but i can not figure out how to
see the files.
within the directory, there are several files that show up as microsoft
edge html files with the file types as shown below.

GeoQSymbols/DipDir/001%20Bedding%20(dipdir).svg

Can anyone help me to get these imported.  i can not get them imported .
thanks for your help
-- 
Byron Veilleux, MSc. P.Geo
Conjugate Geologic Services Limited
Calgary, Alberta Canada
by...@conjugategeo.com
Cell:4037108414
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Re: [Qgis-user] QGIS Model Designer

[Richard McDonnell]

Apologies,
I meant I have very little experience working with Python…something I am 
constantly saying I need to remedy!
Regards,

Richard


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From: Nicolas Cadieux 
Sent: 12 January 2022 16:31
To: Richard McDonnell ; Qgis Users List 

Subject: Re: [Qgis-user] QGIS Model Designer


HI,

Python is installed with QGIS.  The easiest way is to go to plugins -> Python 
console.

Nicolas
On 2022-01-12 5:37 a.m., Richard McDonnell wrote:
Hi,
Thanks for getting back. I am afraid I have no Python, but I will give it a go!!
Regards & Thanks

Richard.


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FRM Data Management

——
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From: Ujaval Gandhi 

Sent: 11 January 2022 14:22
To: Richard McDonnell 

Cc: qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] QGIS Model Designer

The batch processing and modeler are mising the 'iterate' feature, and this 
type of batch processing + merge functionality will be useful. I have a 
tutorial on how to write a bit of pyqgis code to do this that shows exactly the 
use case you have. But it can be used with any other processing algorithm. 
https://www.qgistutorials.com/en/docs/3/processing_algorithms_pyqgis.html
[Image removed  by sender. 
Logo]

Ujaval Gandhi

Spatial Thoughts

mobile: +91-8095684687

email: uja...@spatialthoughts.com

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On Mon, Jan 10, 2022 at 4:52 PM Richard McDonnell 
mailto:richard.mcdonn...@opw.ie>> wrote:
Hi All,
Apologies, but I think I have found a Plugin, which looks promising “Point 
sampling tool” which seems to do what I want.
Regards,

Richard


——
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FRM Data Management

——
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From: Qgis-user 
mailto:qgis-user-boun...@lists.osgeo.org>> 
On Behalf Of Richard McDonnell
Sent: 10 January 2022 11:18
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] QGIS Model Designer

Hi all.
I have been asked to sample over 100 raster pixel values using a single point 
file.
I can use the “Sample raster values” Tool, but this only outputs for one 
Raster. I have looked at batching this, but it will produce 100’s of point 
files which I will have to merge together. So I was looking at using the Model 
Designer, but again it can’t accept multiple raster inputs.

What I would like to know, is how I might easily create a single shapefile with 
a column for each raster containing the sampled value. The easiest way would be 
to somehow sample the first raster saving the output then loop back to the 
second raster, but this time using output from the first sampling to sample the 
second. This looping would continue until all raster’s had been sampled.

Any help appreciated.
Regards,

Richard

——
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FRM Data Management

——
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Re: [Qgis-user] QGIS Model Designer

[Nicolas Cadieux]

HI,

Python is installed with QGIS.  The easiest way is to go to plugins -> 
Python console.


Nicolas

On 2022-01-12 5:37 a.m., Richard McDonnell wrote:


Hi,

Thanks for getting back. I am afraid I have no Python, but I will give 
it a go!!


Regards & Thanks

Richard.


——
Richard McDonnell MSc GIS, FME Certified Professional
/FRM Data Management/

——
Oifig na nOibreacha Poiblí
Office of Public Works

Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36
Jonathan Swift Street, Trim, Co Meath, C15 NX36
——
M +353 87 688 5964 T +353 46 942 2409
https://gov.ie/opw

——
To send me files larger than 30MB, please use the link below 
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Email Disclaimer: 
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*From:*Ujaval Gandhi 
*Sent:* 11 January 2022 14:22
*To:* Richard McDonnell 
*Cc:* qgis-user@lists.osgeo.org
*Subject:* Re: [Qgis-user] QGIS Model Designer

The batch processing and modeler are mising the 'iterate' feature, and 
this type of batch processing + merge functionality will be useful. I 
have a tutorial on how to write a bit of pyqgis code to do this that 
shows exactly the use case you have. But it can be used with any other 
processing algorithm. 
https://www.qgistutorials.com/en/docs/3/processing_algorithms_pyqgis.html


Image removed by sender. Logo 



*Ujaval Gandhi***

Spatial Thoughts

mobile: +91-8095684687

email: uja...@spatialthoughts.com 

Image removed by sender. LinkedIn icon 
Image removed by sender. 
Twitter icon 



On Mon, Jan 10, 2022 at 4:52 PM Richard McDonnell 
 wrote:


Hi All,

Apologies, but I think I have found a Plugin, which looks
promising “Point sampling tool” which seems to do what I want.

Regards,

Richard

*
——*
*Richard McDonnell MSc GIS, FME Certified Professional*
/FRM Data Management/

——
*Oifig na nOibreacha Poiblí*
Office of Public Works

*Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36 *
Jonathan Swift Street, Trim, Co Meath, C15 NX36
——
M +353 87 688 5964 T +353 46 942 2409
https://gov.ie/opw 

——
To send me files larger than 30MB, please use the link below
https://filetransfer.opw.ie/filedrop/richard.mcdonn...@opw.ie


Email Disclaimer:
https://www.gov.ie/en/organisation-information/439daf-email-disclaimer/


*From:*Qgis-user mailto:qgis-user-boun...@lists.osgeo.org>> *On Behalf Of *Richard
McDonnell
*Sent:* 10 January 2022 11:18
*To:* qgis-user@lists.osgeo.org 
*Subject:* [Qgis-user] QGIS Model Designer

Hi all.

I have been asked to sample over 100 raster pixel values using a
single point file.

I can use the “Sample raster values” Tool, but this only outputs
for one Raster. I have looked at batching this, but it will
produce 100’s of point files which I will have to merge together.
So I was looking at using the Model Designer, but again it can’t
accept multiple raster inputs.

What I would like to know, is how I might easily create a single
shapefile with a column for each raster containing the sampled
value. The easiest way would be to somehow sample the first raster
saving the output then loop back to the second raster, but this
time using output from the first sampling to sample the second.
This looping would continue until all raster’s had been sampled.

Any help appreciated.

Regards,

Richard

*
——*
*Richard McDonnell MSc GIS, FME Certified Professional*
/FRM Data Management/

——
*Oifig na nOibreacha Poiblí*
Office of Public Works

*Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36 *
Jonathan Swift Street, Trim, Co Meath, C15 NX36
——
M +353 87 688 5964 T +353 46 942 2409
https://gov.ie/opw 

——
To send me files larger than 30MB, please use the link below
https://filetransfer.opw.ie/filedrop/richard.mcdonn...@opw.ie


Email Disclaimer:
https://www.gov.ie/en/organisation-information/439daf-email-disclaimer/


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Re: [Qgis-user] Readonly gpkg

[Even Rouault]

I think the simplest and safest change is to remove all code that
changes the journal mode as a side effect of access.  People that want
WAL can pragma it on, with DBA hat on.  In my view sqlite's WAL option
breaks the previous concept that you can have a database without
understanding databases, and as long as it's a DBA choice, that's ok.
WAL is really a programmer level concept. I'm not sure a QGIS advanced 
user/admin should be aware of that.


Separately from the "DBA chooses journal mode" view, I feel that
constantly flipping the journal mode is asking for trouble.   I suppose
one could write a test with N processes that each connect, set a random
choice of WAL or DELETE, wait a bit, do a transaction to increment a
value, perhaps repeat that, and then if they set WAL set DELETE and
exit, as a way to look for races.   Maybe sqlite3's own tests already do
that.
If you do no turn WAL on when editing, the following QGIS tests will 
fail (and some real world situations like where you have a huge layer 
being refreshed in the background while trying to edit it):


https://github.com/qgis/QGIS/commit/b6b8759efbeb833d0d3dbf6df008087701361ad3#diff-56354e2446fe2cb6d1ee92d4e984091172e964e90f3be4d3d42276e033c4986eR92

--
http://www.spatialys.com
My software is free, but my time generally not.

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Re: [Qgis-user] Readonly gpkg

[Greg Troxel]

Even Rouault  writes:

>> So it looks like qgis is also resetting the mode to delete, or perhaps
>> GDAL is doing that.   I haven't found that in the sources so far.
>
> Both attempt at doing this:
>
> - QGIS at
> https://github.com/qgis/QGIS/blob/master/src/core/providers/ogr/qgsogrproviderutils.cpp#L1172
> to #L1230 when it closes the last connection instance of a GPKG file

Thanks, I see that this code forces mode to DELETE.

> - and OGR too :
> https://github.com/OSGeo/gdal/blob/master/ogr/ogrsf_frmts/sqlite/ogrsqlitedatasource.cpp#L367

I think that's something else, disabling "persistent WAL" which is about
leaving the no-longer-used wal/shm files in the filesystem, so that
those that can access the database file but don't have write permission
for the directory will see fewer errors.

https://sqlite.org/c3ref/c_fcntl_begin_atomic_write.html#sqlitefcntlpersistwal

I have a gpkg in WAL mode currently and ran ogrinfo on it, and the mode
was still WAL afterwards.  I'm not sure that hits the code path you
referenced, though.

> Probably the most reasonable & simple change for QGIS would be turn
> WAL only when QGIS update mode is turned on. Would require testing
> that deadlocks don't occur with existing readers prior to turning WAL
> on (or accept that risk...)

I think the simplest and safest change is to remove all code that
changes the journal mode as a side effect of access.  People that want
WAL can pragma it on, with DBA hat on.  In my view sqlite's WAL option
breaks the previous concept that you can have a database without
understanding databases, and as long as it's a DBA choice, that's ok.

Separately from the "DBA chooses journal mode" view, I feel that
constantly flipping the journal mode is asking for trouble.   I suppose
one could write a test with N processes that each connect, set a random
choice of WAL or DELETE, wait a bit, do a transaction to increment a
value, perhaps repeat that, and then if they set WAL set DELETE and
exit, as a way to look for races.   Maybe sqlite3's own tests already do
that.



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Re: [Qgis-user] Readonly gpkg

[Greg Troxel]

 writes:

> It feels it would be best to default to not mucking around with a gpkg's 
> setting at all unless and until we're writing to it (editing existing layers 
> or creating new ones). 
> When a new layer is added or existing layer opened for editing, then
> accept the gpkg's current setting or change it to WAL or DELETE, based
> on that application's setting. And as a service to the user,
> facilitate changing it for a specific gpkg file (for instance via
> browser).

I would agree with the first half-sentence and rephrase:

  I think it's best for programs that access geopackages to refrain from
  changing database properties as a side effect of access, period.

I think an important point behind this is that journal mode is a
property of the database, not of a program's access to a database.
And, which is appropriate is a choice that affects all aspects and all
use of the database.

I don't see any concept of DEBUG at

  https://sqlite.org/pragma.html#pragma_journal_mode

In reading that, note (in the context of storing geodata):

  TRUNCATE and PERSIST are flavors of DELETE, and I am not aware of
  evidence that they significantly help in any actual relevant
  situations.

  MEMORY is unsafe with respect to crashes, and thus should not be used.

  OFF is unsound and should never be used; it only makes sense for a
  database with one client that is always recreated on program start.

So I think we are talking about a subset of that world, where there is
only DELETE and WAL.  I'll assume that was a wordo and have edited.
 
> As I think about it, seems the application-level setting needs to have four 
> levels?
> - Create new gpkg files as WAL, use existing setting for existing gkpg [read 
> and write]
> - Create new gpkg files as DELETE, use existing setting for existing gkpg 
> [read and write]

This is adding in database administrator (DBA) features, which is ok,
but I'm also not sure it's necessary.

DELETE should be the default, because it doesn't have the 'reading leads
to writing' problem, and because WAL is unsafe on remote filesystems, so
enabling requires the DBA to determine that it will not lead to unsound
behavior.

So another view is "just don't ever set any journal options".  Then if
the DBA wants to set WAL, they can do that.  gdal could have an option
for that, either an env var to set it on create, or a command to set it
on a geopackage.  And the qgis DB browser could offer DBA features.  a
big point is that journal mode for a geopackage is really not about
qgis; it's about all users of the geopackage.

> - Set to WAL whenever writing to gpkg
> - Set to DELETE whenever writing to gpkg

I don't think this option should exist.   I view it as a bug for a
program that accesses a database to change the journal mode, unless that
program is acting to do something on behalf of a DBA, and changing for
every write is not DBA behavior.

If there are multiple clients and they have different settings, they'll
fight each other.



I also note that I haven't seen any real benchmarks on real qgis usage
that shows that WAL improves performance over DELETE in a way that
matters.  My own perception, with relatively light write workloads, is
that the sqlite transaction commit cost of an entire qgis sessions is
negligible.  That also argues for "it's ok for almost all geopackages to
be in DELETE mode".


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Re: [Qgis-user] dwg files cant be synchronized

[Richard McDonnell]

Hi,
As long as you have some kind of background Mapping You could try the following 
Plugins

· Vector Blender  https://github.com/olivierdalang/VectorBender

· Vector Correction https://north-road.github.io/vector_correction/
Regard’s,

Richard



——
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FRM Data Management

——
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From: Qgis-user  On Behalf Of Boaz Bar Ilan
Sent: 12 January 2022 10:00
To: qgis-user 
Subject: [Qgis-user] dwg files cant be synchronized

i from time to time i get dwg files that it impossible to put them in the  
right csr . is there something to help ?
boaz
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Re: [Qgis-user] Readonly gpkg

[Even Rouault]

So it looks like qgis is also resetting the mode to delete, or perhaps
GDAL is doing that.   I haven't found that in the sources so far.


Both attempt at doing this:

- QGIS at 
https://github.com/qgis/QGIS/blob/master/src/core/providers/ogr/qgsogrproviderutils.cpp#L1172 
to #L1230 when it closes the last connection instance of a GPKG file


- and OGR too : 
https://github.com/OSGeo/gdal/blob/master/ogr/ogrsf_frmts/sqlite/ogrsqlitedatasource.cpp#L367



Probably the most reasonable & simple change for QGIS would be turn WAL 
only when QGIS update mode is turned on. Would require testing that 
deadlocks don't occur with existing readers prior to turning WAL on (or 
accept that risk...)





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My software is free, but my time generally not.

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Re: [Qgis-user] Readonly gpkg

[Greg Troxel]

Nyall Dawson  writes:

>> Nyall Dawson  writes:
>>
>> > On Wed, 12 Jan 2022 at 11:00, Greg Troxel  wrote:
>>
>> Right now, I think WAL/DELETE is a property of the sqlite3 file which
>> contains the geopackage data.  But it's a sqlite3 property, not a
>> geopackage property.  (And qgis whacks it on every open.)
>>
>> If I am following, you are suggesting a geopackage-level property (in
>> some table?), and a rule that when a reader or write opens the file, if
>> the sqlite3 setting does not match, the sqlite3 setting is forced and an
>> error is logged?
>
> That's correct, but without the error logging.

Maybe I'm being too CS-compulsive, but if the geopackage spec is
extended to specify a sqlite3 journal mode, then it's a bug if the
database is ever in a different mode.  I was suggesting logging so that
this bug would be noticed and could be fixed, rather then silently
papered over.

I read the gdal code, and if SQLITE_JOURNAL_MODE is not set, no forcing
is done.   So I wonder if anything other than qgis sets the journal mode
currently.

Also, it seems that *only* WAL is persistent.  Otherwise "DELETE" is
chosen on open.

  https://sqlite.org/pragma.html#pragma_journal_mode

However with some quick command-line testing, it seems that the behavior
is not quite from what I expect.  With qgis open, I see wal/shm files as
I'd expect from the current code, and the pragma returns wal.  But when
wgis exits, the mode has been [qreset to delete.

So it looks like qgis is also resetting the mode to delete, or perhaps
GDAL is doing that.   I haven't found that in the sources so far.


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Re: [Qgis-user] QGIS and user management

[Richard Duivenvoorde]

On 1/12/22 11:22, Possberg, Hendrik wrote:

Dear List,

is it possible to integrate an user management into QGIS?

Any help would be appreciated.


Mmm, this is a very open question...

Please be more clear what you mean by 'a user management', else I do not think 
somebody can give a sound answer :-)

Regards,

Richard Duivenvoorde
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Re: [Qgis-user] Readonly gpkg

[pergler]

It feels it would be best to default to not mucking around with a gpkg's 
setting at all unless and until we're writing to it (editing existing layers or 
creating new ones). 
When a new layer is added or existing layer opened for editing, then accept the 
gpkg's current setting or change it to WAL or DELETE, based on that 
application's setting. And as a service to the user, facilitate changing it for 
a specific gpkg file (for instance via browser).

"Whacking" it to WAL on any open (even if just reading data, making no edits) 
feels like not playing well with others.

As I think about it, seems the application-level setting needs to have four 
levels?
- Create new gpkg files as WAL, use existing setting for existing gkpg [read 
and write]
- Create new gpkg files as DEBUG, use existing setting for existing gkpg [read 
and write]
- Set to WAL whenever writing to gpkg
- Set to DEBUG whenever writing to gpkg

In all of this, just trying to be helpful. Ignore me if I'm out of my depth and 
just creating noise...

Martin

-Original Message-
From: Nyall Dawson  
Sent: January 11, 2022 20:46

On Wed, 12 Jan 2022 at 11:40, Greg Troxel  wrote:
>
> Right now, I think WAL/DELETE is a property of the sqlite3 file which 
> contains the geopackage data.  But it's a sqlite3 property, not a 
> geopackage property.  (And qgis whacks it on every open.)
>
> If I am following, you are suggesting a geopackage-level property (in 
> some table?), and a rule that when a reader or write opens the file, 
> if the sqlite3 setting does not match, the sqlite3 setting is forced 
> and an error is logged?

That's correct, but without the error logging.

Nyall

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Re: [Qgis-user] QGIS Model Designer

[Richard McDonnell]

Hi,
Thanks for getting back. I am afraid I have no Python, but I will give it a go!!
Regards & Thanks

Richard.


——
Richard McDonnell MSc GIS, FME Certified Professional
FRM Data Management

——
Oifig na nOibreacha Poiblí
Office of Public Works

Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36
Jonathan Swift Street, Trim, Co Meath, C15 NX36
——
M +353 87 688 5964 T +353 46 942 2409
https://gov.ie/opw

——
To send me files larger than 30MB, please use the link below 
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Email Disclaimer: 
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From: Ujaval Gandhi 
Sent: 11 January 2022 14:22
To: Richard McDonnell 
Cc: qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] QGIS Model Designer

The batch processing and modeler are mising the 'iterate' feature, and this 
type of batch processing + merge functionality will be useful. I have a 
tutorial on how to write a bit of pyqgis code to do this that shows exactly the 
use case you have. But it can be used with any other processing algorithm. 
https://www.qgistutorials.com/en/docs/3/processing_algorithms_pyqgis.html
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On Mon, Jan 10, 2022 at 4:52 PM Richard McDonnell 
mailto:richard.mcdonn...@opw.ie>> wrote:
Hi All,
Apologies, but I think I have found a Plugin, which looks promising “Point 
sampling tool” which seems to do what I want.
Regards,

Richard


——
Richard McDonnell MSc GIS, FME Certified Professional
FRM Data Management

——
Oifig na nOibreacha Poiblí
Office of Public Works

Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36
Jonathan Swift Street, Trim, Co Meath, C15 NX36
——
M +353 87 688 5964 T +353 46 942 2409
https://gov.ie/opw

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To send me files larger than 30MB, please use the link below 
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From: Qgis-user 
mailto:qgis-user-boun...@lists.osgeo.org>> 
On Behalf Of Richard McDonnell
Sent: 10 January 2022 11:18
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] QGIS Model Designer

Hi all.
I have been asked to sample over 100 raster pixel values using a single point 
file.
I can use the “Sample raster values” Tool, but this only outputs for one 
Raster. I have looked at batching this, but it will produce 100’s of point 
files which I will have to merge together. So I was looking at using the Model 
Designer, but again it can’t accept multiple raster inputs.

What I would like to know, is how I might easily create a single shapefile with 
a column for each raster containing the sampled value. The easiest way would be 
to somehow sample the first raster saving the output then loop back to the 
second raster, but this time using output from the first sampling to sample the 
second. This looping would continue until all raster’s had been sampled.

Any help appreciated.
Regards,

Richard

——
Richard McDonnell MSc GIS, FME Certified Professional
FRM Data Management

——
Oifig na nOibreacha Poiblí
Office of Public Works

Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36
Jonathan Swift Street, Trim, Co Meath, C15 NX36
——
M +353 87 688 5964 T +353 46 942 2409
https://gov.ie/opw

——
To send me files larger than 30MB, please use the link below 
https://filetransfer.opw.ie/filedrop/richard.mcdonn...@opw.ie

Email Disclaimer: 
https://www.gov.ie/en/organisation-information/439daf-email-disclaimer/


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[Qgis-user] QGIS and user management

[Possberg, Hendrik]

Dear List,

is it possible to integrate an user management into QGIS?

Any help would be appreciated.
Thanks in advance.

Kind regards
Hendrik Poßberg

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[Qgis-user] dwg files cant be synchronized

[Boaz Bar Ilan]

i from time to time i get dwg files that it impossible to put them in the
right csr . is there something to help ?
boaz
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