Re: [Qgis-user] Performance of MSSQL Server with QGIS 3.4

[Nyall Dawson]

On Tue, 30 Oct 2018 at 05:18, Baker, Matthew  wrote:

> Everything was working fine even with version 3.2, and additionally, I tested 
> with version 2.18 (which used to work fine), and the same issue is happening.

Just to clarify -- you mean that 2.18 shows the same performance issue?

My suspicion here is that you're running into SQL Server's (very
annoying) invalid geometry handling. We've been fighting with this for
a couple of releases, and it breaks down to two choices:

1. Don't have any code in place on QGIS' side to overcome invalid
geometries on SQL server databases. Benefit: fastest performance.
Downside: if ANY features in your table have invalid geometries, SQL
Server silently aborts the request and returns a truncated table. You
may be missing features and never even know about them.

2. Handle invalid geometries by repairing all invalid geometries when
fetching from SQL server. Benefit: no issues with randomly truncated
tables. Downside: much slower retrieval of features due to all the
extra processing (done on the SQL server itself)

Since later 2.18 releases and QGIS 3.4 we play it safe and take
approach 2 by default. Because it's better to have a slower provider
instead of silent data loss. BUT if you're 100% confident that your
database has no invalid geometries, and never will have them, then you
can take off the safeties and run at full performance by changing a
setting in your SQL Server connection. Look for the "Skip invalid
geometry handling" checkbox under the connection properties and turn
it on. But you've been warned, turning this setting on pushes all
responsibility back TO YOU to ensure that your database is safe.
You'll get 0 warnings if it isn't, and you'll have randomly missing
features from your layers.

I wish there was another approach here, but as of current SQL Server
versions there isn't*. Frankly, it's just a very poor decision made by
SQL Server's engineers which makes SQL Server an inferior choice for
an enterprise spatial database.

Nyall

* if there is something we've missed -- please let us know!

>
>
>
> This issue doesn’t seem to lie in the server itself, as our DB GUI’s (MSSQL 
> Server Management Studio, DBeaver, DataGrip) all seem to be behaving normally 
> – tables displaying with no issue, queries performing fine, etc.
>
>
>
> Any thoughts appreciated!
>
>
>
> Thank you!
>
>
>
> -Matthew Baker
>
> Denver Public Schools
>
> Denver, CO, USA
>
>
>
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Re: [Qgis-user] getFeatures() and fields()

[Nyall Dawson]

On Tue, 30 Oct 2018 at 06:39, Roberto Herrero  wrote:
>
> getFeatures() and fields() do not seem to work in Qgis3.2

They 100% work -- if they didn't, QGIS wouldn't be good for anything
except wasting some space on your computer ;)

> # Open vector layer
> LayerName = u'Vector_layer.shp'
> VectorLayer = qgis.core.QgsVectorLayer(LayerName, 'mylayer', 'ogr')

I suspect this is where the issue sits -- try checking

assert VectorLayer.isValid()

here. My suspicion is that your relative path 'Vector_layer.shp' is
not working, and will need to be an absolute path.

Nyall
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Re: [QGIS-it-user] Selezione tramite un'espressione - Distance

[Ludovico]

Il risultato è corretto, è  un numero ma in realtà la selezione avviene ma su
i due punti piu6 distante, mentre il più  vicino non viene selezionato 



-
Dott. For. Ludovico Frate, PhD

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Re: [QGIS-it-user] QGIS - Esportazione file

[Martina Savarese]

Il Lun 29 Ott 2018 21:19 marti_  ha scritto:

> (con cad usavo uno 0,01)
>

... x 10 :D
Anche uno 0,09

Martina

>
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[Qgis-user] getFeatures() and fields()

[Roberto Herrero]

getFeatures() and fields() do not seem to work in Qgis3.2

I'm running the following pyqgis script:

=
#!/usr/bin/python
# -*- coding: utf8 -*-

import qgis.core

# Open vector layer
LayerName = u'Vector_layer.shp'
VectorLayer = qgis.core.QgsVectorLayer(LayerName, 'mylayer', 'ogr')
# Get the list of features
featureList = []
for feature in VectorLayer.getFeatures():
featureList.append(feature)
print("Feature list size = " + str(len(featureList)))
# Make a list with the field names
fieldList = VectorLayer.fields()
print("Field list size = " + str(len(fieldList)))
for field in VectorLayer.fields():
print(field.name(), field.typeName())


Both the features and the field list have zero size. However, when loaded
manually, the vector layer contains fields and features.

Any idea?

Thank you very much,
Roberto Herrero
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Re: [QGIS-it-user] Selezione tramite un'espressione - Distance

[Totò]

Ludovico wrote
> Ciao a tutti,
> stavo facendo delle prove per selezionare partendo da un layer di 3
> 'punti'
> il punto più vicino ad un punto X contenuto in un altro layer 'puntoA' (un
> solo record)
> 
> La funzione che ho utilizzato è
> 
> distance($geometry, geometry(get_feature_by_id('puntoA', 1)))
> 
> che però mi da l'esatto contrario ovvero selezione gli altri due punti ma
> non quello più vicino

Il risultato che ottiene è corretto.

L'espressione che usi ha come output un numero e quindi l'espressione è
sempre valutata TRUE (VERA),
ecco perché ti seleziona sempre tutte le $geometry (geometria corrente)

saluti



-
https://pigrecoinfinito.wordpress.com/
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Re: [QGIS-it-user] QGIS - Esportazione file

[marti_]

Scusa ho scordato un altro possibile metodo per il grigio fuori perimetro,
non sperimentato con QGIS a stampa  e che utilizzavo con Autocad per
ottenere l'effetto di trasparenza:
anziché un retino pieno, un righettato molto fitto e con pennino
sottilissimo (con cad usavo uno 0,01), non so come renda al di sotto dei 200
ppi, però esportato in pdf come vettoriale forse funziona

Martina



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Re: [Qgis-user] geopackage spatial query

[Bo Victor Thomsen]

Hi Klaus -

Even though the GeoPackage format is using a spatialite database as the 
foundation, the internal format of the geopackage geometry type differs 
from the spatialite type. So yon can't directly use spatialite geometry 
based function with geopackage geometries.


However you can "wrap" every use of GeoPackage geometries in a converter 
function: *CastAutomagic(geom)*, which converts a GeoPackage geometry to 
a Spatialite geometry.


So a call to: /st_area (geom)/ becomes /st_area(*CastAutomagic(*geom*)*)/

(No, It's not nice and it certainly not effective use of computer 
resources, however it works.)


There is a thread about the why's and why-not's for this subject in the 
QGIS-user list around september 13 , 2018


Regards

Bo Victor Thomsen
LIFA Landinspektører A/S,
Denmark




Den 29/10/2018 kl. 14.35 skrev Mithoefer:

Dear List,

I have a geopackage database and tried to use a spatial sql function 
(st_area) using the db manager in qgis 3.4  --> select st_area(geom) 
from polygon_filename. The function is available, but the result is 
Null. What is the problem?


Thanks a lot

Kind regards

Klaus
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Re: [QGIS-it-user] QGIS - Esportazione file

[marti_]

Nelle due tavole che non ti si stampano c'è un effetto "pixelato" nella parte
fuori perimetrazione retinate di grigio che invece non c'è nelle altre due.
Provo a fare un'ipotesi: avendo zoomato molto l'immagine sembra tu abbia lì
una ctr raster ritagliata (cioè da cui hai ritagliato le aree del piano)
messa sopra e a cui hai dato la trasparenza, trasparenza che a quanto pare
viene gestita bene se esporti in jpeg, ma che nella trasformazione in pdf
crea problemi.
Le soluzione che mi vengono in mente sono:
1) Rimetti la ctr sotto togliendole la trasparenza e prova a o usare la
fusione moltiplica sul retino come dice Amedeo, o dare la trasparenza al
colore del retino [1];
2) Oppure utilizza la stesso metodo usato nelle due tavole che ti si
stampano :) 

Martina

[1]  





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[Qgis-user] Performance of MSSQL Server with QGIS 3.4

[Baker, Matthew]

Hi all,

For some reason, our MSSQL Server experience has changed drastically with QGIS 
3.4.

The issue resides in the display / refreshing of tables in the database. For 
some reason, the refresh hangs for many minutes (5-10), and freezes up QGIS.

Previous to our upgrade, we have had great success using MSSQL Server, and no 
connection issues at all.

Are there any changes to 3.4 and MSSQL that automatically implements a 
geometry_columns table? We haven't used one in the past, with no negative 
effect. Is there a process new to QGIS 3.4 that gets kicks off in the database 
that might be spinning causing QGIS to hang?

Everything was working fine even with version 3.2, and additionally, I tested 
with version 2.18 (which used to work fine), and the same issue is happening.

This issue doesn't seem to lie in the server itself, as our DB GUI's (MSSQL 
Server Management Studio, DBeaver, DataGrip) all seem to be behaving normally - 
tables displaying with no issue, queries performing fine, etc.

Any thoughts appreciated!

Thank you!

-Matthew Baker
Denver Public Schools
Denver, CO, USA

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[QGIS-it-user] Selezione tramite un'espressione - Distance

[Ludovico]

Ciao a tutti,
stavo facendo delle prove per selezionare partendo da un layer di 3 'punti'
il punto più vicino ad un punto X contenuto in un altro layer 'puntoA' (un
solo record)

La funzione che ho utilizzato è

distance($geometry, geometry(get_feature_by_id('puntoA', 1)))

che però mi da l'esatto contrario ovvero selezione gli altri due punti ma
non quello più vicino



-
Dott. For. Ludovico Frate, PhD

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Re: [Qgis-user] geopackage spatial query

[Burghardt.Scholle]

Hi Klaus,
as far as I understand it, geopackage does not support spatial functions  - 
opposite to spatialite (see [1]). I mean, this topic was also discussed at the 
QGIS user meeting in Essen.

[1] 
https://gis.stackexchange.com/questions/228210/using-geopackage-instead-of-spatialite-and-vice-versa

Regards
Burghardt


> -Ursprüngliche Nachricht-
> Von: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] Im Auftrag von
> Mithoefer
> Gesendet: Montag, 29. Oktober 2018 14:36
> An: qgis-user@lists.osgeo.org
> Betreff: [Qgis-user] geopackage spatial query
> 
> Dear List,
> 
> I have a geopackage database and tried to use a spatial sql function
> (st_area) using the db manager in qgis 3.4  --> select st_area(geom)
> from polygon_filename. The function is available, but the result is
> Null. What is the problem?
> 
> Thanks a lot
> 
> Kind regards
> 
> Klaus
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Re: [Qgis-user] GDAL and https links on qgis

[Guy Doulberg]

Ok, thanks for the info.



On Mon, Oct 29, 2018 at 3:06 PM Luigi Pirelli  wrote:

> the main problem is that Windows have only a limited list of thrusted CAs
> in a default installation. Thrusted CA are added atuomatically through a
> remote query to some m$ service when you browse an URl with a WinApi
> capable browser... eg. Explorer (end if I remember well also WinApi)
> So the only way is to "hide" this underground handshake using a adhoc win
> code using WinApi to load CA or using (if it works) CURL.
>
> So the anwer is... not so simple, and you should thrust the M$ service
> that thrust the CAs. No idea what is the best solution.
>
> Luigi Pirelli
>
>
> **
> * LinkedIn: https://www.linkedin.com/in/luigipirelli
> * Stackexchange: http://gis.stackexchange.com/users/19667/luigi-pirelli
> * GitHub: https://github.com/luipir
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> *
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> * Hire me: http://goo.gl/BYRQKg
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>
>
> On Mon, 29 Oct 2018 at 11:37, Guy Doulberg  wrote:
>
>> Hi
>>
>> I am working on a project that releases big raster imagery,
>>
>> I am trying to create a product that can be used in qgis.
>>
>> The product I had in mind is a raster (VRT) served from the an https
>> endpoint referred by local vrt file
>>
>> I think the issue is relevant to anyone using "/vsicurl/https://...;
>> rasters or even vectors not only vrt.
>>
>> I tested this product on my 3.4 and 2.18 qgis on linux and it worked with
>> no problem
>>
>> But then I tested in on qgis 2.18 and 3.4 on Windows and it turned out
>> there were the following failures:
>>
>> SSL certificate problem: unable to get local issuer certificate
>>
>> It can be fixed by setting CURL_CA_BUNDLE to a certificate bundle either
>> I downloaded from Mozilla site or from the OS itself.
>>
>> Can you think of A more elegant solution? I don't like the idea that I
>> will need to tell my users to hassle with these settings
>>
>> And I don't like the idea of using http, to the data of those products.
>>
>> Maybe that is more a request for the qgis-dev mailing list, but is there
>> a way to compile qgis with gdal that already has all the certificates
>> authorities?
>>
>> Thanks, Guy
>>
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>
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Re: [Qgis-user] geopackage spatial query

[Stefan Giese]

it seems to be still a bug: https://issues.qgis.org/issues/18974

Mit freundlichen Grüßen
Stefan Giese
Projektleiter/Consultant
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Am 29.10.2018 um 14:35 schrieb Mithoefer:

Dear List,

I have a geopackage database and tried to use a spatial sql function 
(st_area) using the db manager in qgis 3.4  --> select st_area(geom) 
from polygon_filename. The function is available, but the result is 
Null. What is the problem?


Thanks a lot

Kind regards

Klaus
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[Qgis-user] geopackage spatial query

[Mithoefer]

Dear List,

I have a geopackage database and tried to use a spatial sql function 
(st_area) using the db manager in qgis 3.4  --> select st_area(geom) 
from polygon_filename. The function is available, but the result is 
Null. What is the problem?


Thanks a lot

Kind regards

Klaus
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Re: [Qgis-user] GDAL and https links on qgis

[Luigi Pirelli]

the main problem is that Windows have only a limited list of thrusted CAs
in a default installation. Thrusted CA are added atuomatically through a
remote query to some m$ service when you browse an URl with a WinApi
capable browser... eg. Explorer (end if I remember well also WinApi)
So the only way is to "hide" this underground handshake using a adhoc win
code using WinApi to load CA or using (if it works) CURL.

So the anwer is... not so simple, and you should thrust the M$ service that
thrust the CAs. No idea what is the best solution.

Luigi Pirelli

**
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*
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On Mon, 29 Oct 2018 at 11:37, Guy Doulberg  wrote:

> Hi
>
> I am working on a project that releases big raster imagery,
>
> I am trying to create a product that can be used in qgis.
>
> The product I had in mind is a raster (VRT) served from the an https
> endpoint referred by local vrt file
>
> I think the issue is relevant to anyone using "/vsicurl/https://...;
> rasters or even vectors not only vrt.
>
> I tested this product on my 3.4 and 2.18 qgis on linux and it worked with
> no problem
>
> But then I tested in on qgis 2.18 and 3.4 on Windows and it turned out
> there were the following failures:
>
> SSL certificate problem: unable to get local issuer certificate
>
> It can be fixed by setting CURL_CA_BUNDLE to a certificate bundle either
> I downloaded from Mozilla site or from the OS itself.
>
> Can you think of A more elegant solution? I don't like the idea that I
> will need to tell my users to hassle with these settings
>
> And I don't like the idea of using http, to the data of those products.
>
> Maybe that is more a request for the qgis-dev mailing list, but is there a
> way to compile qgis with gdal that already has all the certificates
> authorities?
>
> Thanks, Guy
>
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[Qgis-user] GDAL and https links on qgis

[Guy Doulberg]

Hi

I am working on a project that releases big raster imagery,

I am trying to create a product that can be used in qgis.

The product I had in mind is a raster (VRT) served from the an https
endpoint referred by local vrt file

I think the issue is relevant to anyone using "/vsicurl/https://...;
rasters or even vectors not only vrt.

I tested this product on my 3.4 and 2.18 qgis on linux and it worked with
no problem

But then I tested in on qgis 2.18 and 3.4 on Windows and it turned out
there were the following failures:

SSL certificate problem: unable to get local issuer certificate

It can be fixed by setting CURL_CA_BUNDLE to a certificate bundle either I
downloaded from Mozilla site or from the OS itself.

Can you think of A more elegant solution? I don't like the idea that I will
need to tell my users to hassle with these settings

And I don't like the idea of using http, to the data of those products.

Maybe that is more a request for the qgis-dev mailing list, but is there a
way to compile qgis with gdal that already has all the certificates
authorities?

Thanks, Guy
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Re: [Qgis-user] Fwd: qgis - v.vol.rst from grass

[Luigi Pirelli]

Hi Francois

is it just matter to create appropriate algorithm descriptop in qgis core?
e.g. doing a Pull Request (with tsts) to have the algoritym supported?

This guid sould give you the appropriate hints
https://github.com/qgis/QGIS/blob/master/python/plugins/processing/algs/grass7/grass7.txt
and obviously all the descriptors available in:
https://github.com/qgis/QGIS/tree/master/python/plugins/processing/algs/grass7/description

this is one of the QGIS part where users can help a lot adding new backend
algorithms with related tests. To create tests for a not tested algorithms
please see this guide:
http://www.opengis.ch/2016/02/04/increasing-the-stability-of-processing-algorithms/

a TODO list for grass is here:
https://github.com/qgis/QGIS/blob/master/python/plugins/processing/algs/grass7/TODO.md

regards

Luigi Pirelli

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On Sun, 28 Oct 2018 at 16:01, Francois Chartier 
wrote:

> Hi
>
> Is the plugin v vol rst available from within qgis?  i didnt see it in the
> list of vector plugin from grass.
> i am looking for a 3d interpolator and i believe only grass can do this in
> open source.
> Are there other plugins that can do 3d interpolation?
> by 3d i am not referring to interpolation of elevation, but by
> interpolation of 3d dataset with xyz + attribute (ex: soil moisture), with
> data points vertically stacked, and would need to interpolate verically and
> horizontally.
>
> thks
> f
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