Re: [Qgis-user] GeoPackage-Hickups

[Paul Wittle]

Hi,

I think I encountered point 2 the other day using QGIS 2 and although it was 
the old version I still found it a bit worrying as the fault appeared to be 
with the GeoPackage format rather than the software (although I'm sure the 
software is heavily involved really).

I tried to add a virtual column to a GeoPackage table which others also had 
open and it resulted in the file becoming locked. QGIS wouldn't close even with 
windows end task!

In the end I had to do a hard reboot (holding the off button) and the others 
had to reboot their PCs and the file unlocked restoring the data.

All in all, I found it extremely worrying and hope that it was just a one off 
really; anything that can lock a PC, even against end task; is in my opinion a 
potentially dangerous format.

It was a fix already dealt with or a problem with the GeoPackage spec that is 
already in hand then that is all fine but if not; I hope it doesn't happen 
again.

Cheers,
Paul

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Today's Topics:

   1. GeoPackage-Hickups (Bernd Vogelgesang)
   2. Re: GeoPackage-Hickups (Matthias Kuhn)
   3. RETORNANDO AO GEOPROCESSAMENTO (Ruy Edy Iglesias da Silveira)


--

Message: 1
Date: Sat, 27 Apr 2019 15:57:18 +0200
From: Bernd Vogelgesang 
To: qgis-user 
Subject: [Qgis-user] GeoPackage-Hickups
Message-ID: 
Content-Type: text/plain; charset=utf-8; format=flowed

Hi,

I try to use Geopackage as my standard format for a while, but so far my joy is 
only moderate.

1. Is it default behaviour, that when I make one layer of this GeoPackage 
editable, all other layers become editable as well?

2. Mostly I add or modify data in a non-spatial table with a relation to a 
point layer. "Most" of the time this works quite ok, but quite often the save 
of the changes is not possible, cause OGR claims that the database is locked. 
Toggle the edit status or refreshing the database in DB Manager does not help, 
so most of the time I have to shut down QGIS to be able to work on. Is there a 
"trick" to unlock the database without having to shut down the application? 
(btw. the files are stored on a synology network drive)

QGIS 3.6.2 on Linux Mint

Cheers,
Bernd


--

Message: 2
Date: Sat, 27 Apr 2019 16:20:17 +0200
From: Matthias Kuhn 
To: Bernd Vogelgesang , qgis-user

Subject: Re: [Qgis-user] GeoPackage-Hickups
Message-ID: <7fd75d08-b974-b500-a74a-9835f1408...@opengis.ch>
Content-Type: text/plain; charset="utf-8"

Hi Bernd,

1. Only when you have set "automatically create transaction groups if possible" 
in the project properties

2. Might possibly be resolved by #1 as well

Matthias

On 4/27/19 3:57 PM, Bernd Vogelgesang wrote:
> Hi,
>
> I try to use Geopackage as my standard format for a while, but so far
> my joy is only moderate.
>
> 1. Is it default behaviour, that when I make one layer of this
> GeoPackage editable, all other layers become editable as well?
>
> 2. Mostly I add or modify data in a non-spatial table with a relation
> to a point layer. "Most" of the time this works quite ok, but quite
> often the save of the changes is not possible, cause OGR claims that
> the database is locked. Toggle the edit status or refreshing the
> database in DB Manager does not help, so most of the time I have to
> shut down QGIS to be able to work on. Is there a "trick" to unlock the
> database without having to shut down the application? (btw. the files
> are stored on a synology network drive)
>
> QGIS 3.6.2 on Linux Mint
>
> Cheers,
> Bernd
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matth...@opengis.ch 
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[Qgis-user] DB Manager:"Load as new layer" query from point data returns invisible poylgon layer

[Bernd Vogelgesang]

Hi,

maybe I miss something obvious, but I can't manage to produce a new
point layer from a query in the DB Manager from a point dataset (First
time going this route, and very old sql-knowledge only).

The query runs fine, I see the results, but when I hit the "Load as new
layer"-button, it adds a new polygon-layer name"QueryLayer" and of
course nothing is visible.

When I create a new virtual layer and paste my query there, it works and
adds a new point layer from my query.

But it seems a bit strange that I have to produce a query, and then copy
it to another section while there is a "load as new layer"-button available.

Any hints?

Cheers,

Bernd

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Re: [Qgis-user] DB Manager:"Load as new layer" query from point data returns invisible poylgon layer

[Alessandro Pasotti]

On Mon, Apr 29, 2019 at 2:00 PM Bernd Vogelgesang 
wrote:

> Hi,
>
> maybe I miss something obvious, but I can't manage to produce a new
> point layer from a query in the DB Manager from a point dataset (First
> time going this route, and very old sql-knowledge only).
>
> The query runs fine, I see the results, but when I hit the "Load as new
> layer"-button, it adds a new polygon-layer name"QueryLayer" and of
> course nothing is visible.
>
> When I create a new virtual layer and paste my query there, it works and
> adds a new point layer from my query.
>
> But it seems a bit strange that I have to produce a query, and then copy
> it to another section while there is a "load as new layer"-button
> available.
>
> Any hints?
>
>
Several issues like this have been fixed in the past, please check newest
releases and if that does not work please file a ticket (attaching test
project & data plus the failing queries).

Kind regards.

-- 
Alessandro Pasotti
w3:   www.itopen.it
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Re: [Qgis-user] (no subject)

[Kirk Schmidt]

Hi Tulika:

You will need a minimum of 3 GCP's for the algorithm to work. With out 
more detail, it is difficult to determine what the issue is.  Please 
provide more detail and I am sure we can find a solution for you.


Kirk


On 4/28/2019 2:35 PM, Tulika Biswas wrote:
I have an issue with using the georeferencer.My problem is after 
adding co ordinates to the map and giving the transformation 
settings.. I am running the georeferencing option.. Then it is being 
displayed on the screen as
"Failed to compute GCP points." and the map is also not being shown in 
the qgis interface..

Plz  help.. Its very urgent..

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--
Kirk Schmidt, MScF, BScF, RPF
General Manager
Nortek Resource Solutions Inc.
RR # 1
Thorburn, NS
B0K 1W0
Tel (902) 922.3607
Email: k...@nortekresources.com
Web: www.nortekresources.com

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Re: [Qgis-user] DB Manager:"Load as new layer" query from point data returns invisible poylgon layer

[Bernd Vogelgesang]

Hi Alessandro,

forgot to mention that I'm on 3.6.2 on Linux Mint. At the moment I have
no running instance of master, so I can't check if it is resolved there.

Added sth to https://issues.qgis.org/issues/21675

Cheers,

Bernd

Am 29.04.19 um 14:11 schrieb Alessandro Pasotti:


On Mon, Apr 29, 2019 at 2:00 PM Bernd Vogelgesang
mailto:bernd.vogelges...@gmx.de>> wrote:

Hi,

maybe I miss something obvious, but I can't manage to produce a new
point layer from a query in the DB Manager from a point dataset (First
time going this route, and very old sql-knowledge only).

The query runs fine, I see the results, but when I hit the "Load
as new
layer"-button, it adds a new polygon-layer name"QueryLayer" and of
course nothing is visible.

When I create a new virtual layer and paste my query there, it
works and
adds a new point layer from my query.

But it seems a bit strange that I have to produce a query, and
then copy
it to another section while there is a "load as new layer"-button
available.

Any hints?


Several issues like this have been fixed in the past, please check
newest releases and if that does not work please file a ticket
(attaching test project & data plus the failing queries).

Kind regards.

--
Alessandro Pasotti
w3: www.itopen.it 
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[Qgis-user] DB Manager: Different results from query in DB Manager and in Virtual Layer

[Bernd Vogelgesang]

Hi,

I have a point dataset with nesting boxes (443) and a non-spatial table
from QField where I filled in the already controlled nesting boxes.

Now trying to find out which bixes are still need to be controlled. To
filter the already boxes, I use this query

SELECT "Birdboxes_GTA_20190316".*
FROM "Birdboxes_GTA_20190316"
WHERE EXISTS (SELECT 1 FROM  "birdbox_kontrolle"  WHERE
"Birdboxes_GTA_20190316"."kasten_nr"= "birdbox_kontrolle"."kastennr")

in DB Manager, this returns the quiet low of 35 matches.

When I now create new Virtual Layer with exact the same query, a point
dataset is produced with the quite resonable amount of 262

Same the other way round: To get those not controlled boxes I use

SELECT "Birdboxes_GTA_20190316".*
FROM "Birdboxes_GTA_20190316"
WHERE NOT EXISTS (SELECT 1 FROM  "birdbox_kontrolle"  WHERE
"Birdboxes_GTA_20190316"."kasten_nr"= "birdbox_kontrolle"."kastennr")

which returns 408 rows, but the more resonable number that is produced
with the virtual layer is 181

I'm happy that all my points are generated correctly, but still I'm a
bit concerned that the query result in DB Manager is so awfully wrong.

Is this just due to my poor sql-knowledge or is it a bug?

Cheers,

Bernd


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Re: [Qgis-user] finding the radius of a curve

[Cory Albrecht]

I tried saving a few layers that had arcs and circles (x,y, r coords), but
QGIS converts each curve to a bunch of straight line segments instead of
saving them as curves. :-(

On Mon, Apr 22, 2019 at 3:33 AM McDonaldR  wrote:

> As your data is in PostGIS and assuming that they are arcs (curved lines
> part of a circle) you could use some geometry and spatial SQL functions to
> calculate the radius of any curve knowing the coordinates of the end points
> of the curve.
>
>
>
> To quote the pseudo code on the linked page:
>
>
>
> “To calculate the radius of an arc, take the height -- "H" -- of the arc
> and divide it by two. Call the result "C." Now take the width -- "W" -- of
> the arc and square it by multiplying it by itself. Call the result "D."
> Next multiply height, "H," by eight and call this result "E." Divide "D" by
> "E" and call the result "F." The radius of the arc is C plus F.”
>
>
>
> https://sciencing.com/calculate-radius-curve-7804090.html
>
>
>
> Could probably be wrapped in a function and run against any curve.
>
>
>
> Ross
>
>
>
> *From:* Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] *On Behalf
> Of *Cory Albrecht
> *Sent:* 19 April 2019 17:08
> *To:* qgis-user@lists.osgeo.org
> *Subject:* Re: [Qgis-user] finding the radius of a curve
>
>
>
> I'll give it a try. Thanks!
>
>
>
> On Sun, Apr 14, 2019 at 7:52 AM Mike Flannigan  wrote:
>
>
> Draw a circle and measure the diameter/radius.
>
> Maybe use this plugin to create a circle:
> https://plugins.qgis.org/plugins/CADDigitize/
>
>
> Mike
>
>
> On 4/13/2019 2:00 PM, qgis-user-requ...@lists.osgeo.org wrote:
> > Hello all,
> >
> > I'm looking for a way to find the radius of a curve (for roads,
> railyways)
> > in QGIS. If it were a paper map I could do it with a drafting compass
> > (calipers to some) and a ruler, but this is a PostGIS layer.
> >
> > Any plugin recommendations or links to a set of steps to accomplish this?
> > Thanks in advance!
>
>
>
> This message is strictly confidential. If you have received this in error,
> please inform the sender and remove it from your system. If received in
> error you may not copy, print, forward or use it or any attachment in any
> way. This message is not capable of creating a legal contract or a binding
> representation and does not represent the views of Angus Council. Emails
> may be monitored for security and network management reasons. Messages
> containing inappropriate content may be intercepted. Angus Council does not
> accept any liability for any harm that may be caused to the recipient
> system or data on it by this message or any attachment.
>
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Re: [Qgis-user] finding the radius of a curve

[Andreas Neumann]

Hi Cory,

Not if you use a file-format that supports arcs: Geopackage, Postgis, 
Interlines, GML. Maybe also FGDB (but not sure if OGR supports curves 
for that format).


Greetings,

Andreas

Am 29.04.19 um 18:21 schrieb Cory Albrecht:
I tried saving a few layers that had arcs and circles (x,y, r coords), 
but QGIS converts each curve to a bunch of straight line segments 
instead of saving them as curves. :-(


On Mon, Apr 22, 2019 at 3:33 AM McDonaldR > wrote:


As your data is in PostGIS and assuming that they are arcs (curved
lines part of a circle) you could use some geometry and spatial
SQL functions to calculate the radius of any curve knowing the
coordinates of the end points of the curve.

To quote the pseudo code on the linked page:

“To calculate the radius of an arc, take the height -- "H" -- of
the arc and divide it by two. Call the result "C." Now take the
width -- "W" -- of the arc and square it by multiplying it by
itself. Call the result "D." Next multiply height, "H," by eight
and call this result "E." Divide "D" by "E" and call the result
"F." The radius of the arc is C plus F.”

https://sciencing.com/calculate-radius-curve-7804090.html

Could probably be wrapped in a function and run against any curve.

Ross

*From:*Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org
] *On Behalf Of *Cory
Albrecht
*Sent:* 19 April 2019 17:08
*To:* qgis-user@lists.osgeo.org 
*Subject:* Re: [Qgis-user] finding the radius of a curve

I'll give it a try. Thanks!

On Sun, Apr 14, 2019 at 7:52 AM Mike Flannigan mailto:mikef...@att.net>> wrote:


Draw a circle and measure the diameter/radius.

Maybe use this plugin to create a circle:
https://plugins.qgis.org/plugins/CADDigitize/


Mike


On 4/13/2019 2:00 PM, qgis-user-requ...@lists.osgeo.org
 wrote:
> Hello all,
>
> I'm looking for a way to find the radius of a curve (for
roads, railyways)
> in QGIS. If it were a paper map I could do it with a
drafting compass
> (calipers to some) and a ruler, but this is a PostGIS layer.
>
> Any plugin recommendations or links to a set of steps to
accomplish this?
> Thanks in advance!

This message is strictly confidential. If you have received this
in error, please inform the sender and remove it from your system.
If received in error you may not copy, print, forward or use it or
any attachment in any way. This message is not capable of creating
a legal contract or a binding representation and does not
represent the views of Angus Council. Emails may be monitored for
security and network management reasons.Messages containing
inappropriate content may be intercepted. Angus Council does not
accept any liability for any harm that may be caused to the
recipient system or data on it by this message or any attachment.


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Re: [Qgis-user] finding the radius of a curve

[Andreas Neumann]

Hi again,

On that matter: If you can isolate only the arc-part of your geometry, 
you could that circular arc into the Postgis-function 
"ST_MinimumBoundingRadius()" to detect center-point and radius. See 
http://www.postgis.net/docs/manual-2.5/ST_MinimumBoundingRadius.html - 
maybe worth a try?


Sample query:

SELECT ST_AsText(center), radius
   FROM ST_MinimumBoundingRadius('CIRCULARSTRING(220268 150415,220227 
150505,220227 150406)');


RESULT:

"POINT(220237.62195122 150455.5)"    "50.6268293270462"

Greetings,

Andreas

Am 29.04.19 um 18:21 schrieb Cory Albrecht:
I tried saving a few layers that had arcs and circles (x,y, r coords), 
but QGIS converts each curve to a bunch of straight line segments 
instead of saving them as curves. :-(


On Mon, Apr 22, 2019 at 3:33 AM McDonaldR > wrote:


As your data is in PostGIS and assuming that they are arcs (curved
lines part of a circle) you could use some geometry and spatial
SQL functions to calculate the radius of any curve knowing the
coordinates of the end points of the curve.

To quote the pseudo code on the linked page:

“To calculate the radius of an arc, take the height -- "H" -- of
the arc and divide it by two. Call the result "C." Now take the
width -- "W" -- of the arc and square it by multiplying it by
itself. Call the result "D." Next multiply height, "H," by eight
and call this result "E." Divide "D" by "E" and call the result
"F." The radius of the arc is C plus F.”

https://sciencing.com/calculate-radius-curve-7804090.html

Could probably be wrapped in a function and run against any curve.

Ross

*From:*Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org
] *On Behalf Of *Cory
Albrecht
*Sent:* 19 April 2019 17:08
*To:* qgis-user@lists.osgeo.org 
*Subject:* Re: [Qgis-user] finding the radius of a curve

I'll give it a try. Thanks!

On Sun, Apr 14, 2019 at 7:52 AM Mike Flannigan mailto:mikef...@att.net>> wrote:


Draw a circle and measure the diameter/radius.

Maybe use this plugin to create a circle:
https://plugins.qgis.org/plugins/CADDigitize/


Mike


On 4/13/2019 2:00 PM, qgis-user-requ...@lists.osgeo.org
 wrote:
> Hello all,
>
> I'm looking for a way to find the radius of a curve (for
roads, railyways)
> in QGIS. If it were a paper map I could do it with a
drafting compass
> (calipers to some) and a ruler, but this is a PostGIS layer.
>
> Any plugin recommendations or links to a set of steps to
accomplish this?
> Thanks in advance!

This message is strictly confidential. If you have received this
in error, please inform the sender and remove it from your system.
If received in error you may not copy, print, forward or use it or
any attachment in any way. This message is not capable of creating
a legal contract or a binding representation and does not
represent the views of Angus Council. Emails may be monitored for
security and network management reasons.Messages containing
inappropriate content may be intercepted. Angus Council does not
accept any liability for any harm that may be caused to the
recipient system or data on it by this message or any attachment.


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[Qgis-user] Shapefile m node values

[Nicolas Cadieux]

Hi,

Is the Shapefile format able to deal with m values AND z values for the nodes 
or just one or the other!  Can I use an m value to identify the first and last 
nodes of a line? I would like to be able to identify when two connecting lines 
are digitize in opposing directions.
Thanks

Nicolas
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Re: [Qgis-user] DB Manager:"Load as new layer" query from point data returns invisible poylgon layer

[Bernd Vogelgesang]

Hi,

it seems that my project was somehow broken. After a while zooming out
froze the application. After setting up everything from zero, the "Load
as new layer" button works as expected. Great!

Big "but": When such a layer (is it a virtual layer?) is present in the
project, I can't edit the underlying GeoPackage anymore. Trying to add
an entry to a table (which of course will change the query result of the
new layer), an error is thrown that the database is locked. Afterwards
all layers from the geopackage even disappear from thecanvas and I can't
even reconnect to the database in DB Manager, so I have to restart QGIS.

Removing this virtual layer from the project enables editing of the
tables again.

This is somehow unpleasant, cause I thought that I finally found a way
to easily indicate the points I still have to work on through a query,
but it seems that visualizing and editing the source at the same time is
not possible :(

With sad greetings,,

Bernd

Am 29.04.19 um 15:27 schrieb Bernd Vogelgesang:


Hi Alessandro,

forgot to mention that I'm on 3.6.2 on Linux Mint. At the moment I
have no running instance of master, so I can't check if it is resolved
there.

Added sth to https://issues.qgis.org/issues/21675

Cheers,

Bernd

Am 29.04.19 um 14:11 schrieb Alessandro Pasotti:


On Mon, Apr 29, 2019 at 2:00 PM Bernd Vogelgesang
mailto:bernd.vogelges...@gmx.de>> wrote:

Hi,

maybe I miss something obvious, but I can't manage to produce a new
point layer from a query in the DB Manager from a point dataset
(First
time going this route, and very old sql-knowledge only).

The query runs fine, I see the results, but when I hit the "Load
as new
layer"-button, it adds a new polygon-layer name"QueryLayer" and of
course nothing is visible.

When I create a new virtual layer and paste my query there, it
works and
adds a new point layer from my query.

But it seems a bit strange that I have to produce a query, and
then copy
it to another section while there is a "load as new layer"-button
available.

Any hints?


Several issues like this have been fixed in the past, please check
newest releases and if that does not work please file a ticket
(attaching test project & data plus the failing queries).

Kind regards.

--
Alessandro Pasotti
w3: www.itopen.it 


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[Qgis-user] 'Keep unavailable layer' at qgis start makes it crash

[Laurence Béchet]

Hi everyone,

I'm trying to open a project which refers to a former layer stored in 
postgresql which is not more in the database. I get asked if I want to 
keep the unavailable layer. If I agree to keep it (I'd like to keep the 
name of the missing layers before I call the replacing ones), qGIS crashes.
Easy workaround: do not keep the layer at startup. However it would be 
neat that the option 'keep' works ...

Is it a known issue?

Windows 8 64 bits
qgis 3.6.2 QGIS code revision 656500e0c4

Regards
Laurence
ARK IN THE PARK Volunteer Co-Ordinator
Cascades Ranger Station
Falls Road, Waitakere
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