Re: [QGIS-it-user] Lizmap popup e file txt/html

[Umberto Zulian]

ciao

la sintassi che uso io  nei popup è questa:

Data aggiornamento: {$aggiorn}
che mi fa vedere il contenuto testuale del campo aggiorn della tabella

Scheda
che mi fa vedere il pdf che è nella cartella .../media/./file.pdf , preso 
dal relativo percorso che è nel campo file_sche


prova a vedere nel sito webgis.provincia.belluno.it


non ho mai provato con i file .txt o .html


Da: QGIS-it-user  per conto di crepaldi 

Inviato: mercoledì 31 maggio 2017 19:45
A: qgis-it-user@lists.osgeo.org
Oggetto: Re: [QGIS-it-user] Lizmap popup e file txt/html

>il ticket dice che i files non sono mostrati quando siano usati i link
>simbolici, invece che il file fisico.
>Inoltre, hai evitato gli spazi nei percorsi?
>Saluti.


Non ho usato spazi né nei nomi dei file né nei percorsi che puntano al file
fisico.
Inizialmente il file html da visualizzare l'avevo salvato in un percorso di
questo tipo:

media/html/file.htm

poi ho provato anche ad eliminare un livello e quindi il nuovo percorso era:

media/file.htm

ma anche in questo caso nulla.
Inoltre se richiamo il contenuto della cella dove si trova il percorso ad un
file pdf in questo modo

{$pdf}

nel popup mi viene visualizzato il percorso al file (non il link), se lo
faccio con la colonna che contiene il percorso al file html non viene
visualizzato nulla.
E' evidente che probabilmente mi sfugge una qualche semplice impostazione,
ma non riesco a capire quale.
Saluti

Davide



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View this message in context: 
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QGIS Italian User - Lizmap popup e file 
txt/html
osgeo-org.1560.x6.nabble.com
Lizmap popup e file txt/html. Ho iniziato da poco ad usare Lizmap 3 e premetto 
che conosco solo le basi della programmazione html. Secondo il manuale di 
Lizmap è possibile visualizzare nei popup anche...


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Re: [Qgis-user] Wrong result with Saga Raster calculator

[Eugenio Trumpy]

Hi Pedro,


I did the same for 5 pixels in the test raster I shared with you yesterday.

The different seems to be a little bit greater.

See the attached sheet.


I don't know if the version of saga, 2.3.1 the mine vs 2.3.2 the yours could 
generate this error,

or if the problem is in qgis process model.


E.






Da: Pedro Venâncio 
Inviato: mercoledì 31 maggio 2017 22:16
A: Eugenio Trumpy
Cc: qgis-user; qgis-developer
Oggetto: Re: [Qgis-user] Wrong result with Saga Raster calculator

Hi Eugenio,

I've created a sample processing model (attached), that works ok, except a 
small error in the result (decimals).

For instance:

Raster  ID  Pixel value

Z_top_res   a   1202,03510276

t_top_res   b   53,6123428345

topoc1  -182,584899902

SAGA Result 1   c   15,1783676147

SAGA Result 2   d   31,9437332153   Diff
Expected Result 1
15,1783679504   0,00335741
Expected Result 2
31,974087   0,0303540069

Formula
1   ifelse(c1>0,-(0.0065*c1-16),(0.0045*c1+16))
2   ifelse(a<500,0,((b-c)/a)*1000)

Using SAGA GUI there is no error.

Could this be because of some roundings in the input / output? (I'm sending for 
the developer's list also).

Thanks!

Best regards,
Pedro Venâncio



2017-05-31 10:56 GMT+01:00 Eugenio Trumpy 
>:


Hi Pedro,

thank you very much to have tested the computation with my test data!
You are right, I checked again the computation and actually it works.

However, I was using Saga raster calculation in a processing modeler, and one 
of the layer I share with you
is the resulting from a previous computation.

In other word the raster layer c=temp_recal.tif comes from a previous 
computation (raster calculator):
ifelse(a>0,-(0.0065*a-16),(0.0045*a+16))
where a is the layer attached, and hence c of the previous  formula is the 
resulting of this first computation.

E.


Da: Pedro Venâncio >
Inviato: mercoledì 31 maggio 2017 11:37
A: frippe12573; qgis-user
Oggetto: Re: [Qgis-user] Wrong result with Saga Raster calculator

Hi Eugenio,

The result with SAGA Raster Calculator seems ok here, on QGIS 2.18.9, SAGA 
2.3.2, both from OSGeo4W64 (result attached).

Z_top_res.tif have values from 724.403 to 1423.553, and so, the first condition 
is never true. Then, it always make ((b-c)/a)*1000, and the result seems ok to 
me.


Pedro



2017-05-31 10:19 GMT+01:00 frippe12573 
>:
Hi Paolo,

the raster have the same size and origin.
The pixels are precisely overlapped.

I tried also r.mapcalc, but I got a worst result.
Here the output of the log:
https://pastebin.com/jNyyzHgf

E.



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[Qgis-user] "Hash Sum mismatch" in QGIS repository

[Jefferson Ferreira-Ferreira]

Hello everyone.

I'm trying to install QGIS in Ubuntu 16.04 and followed all guidelines in
QGIS website. But when I run sudo apto-get update I get the error message:

Get:7 http://qgis.org/debian xenial/main amd64 Packages
[15,3kB]
Err:7 http://qgis.org/debian xenial/main amd64
Packages
  Hash Sum mismatch


And it's preventing me to propoerly install QGIS. Any ideas on that issue?


PS.: I already (1) cleaned up apt-get and tried to update again, (2)
deleted all cached repositories and tried to update again (what download
fresh metadata from repositories), but it's not working.


*Jefferson Ferreira-Ferreira, **PhD (abd)*

*Geographer*



*Ecosystem Dynamics Observatory  -
EcoDyn/UNESP*
*Department of **Geography *
*Institute of Geosciences and Exact Sciences** (IGCE)*
*São Paulo State University (UNESP)*
*Rio Claro, SP - Brazil*
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Re: [Qgis-user] Wrong result with Saga Raster calculator

[Madry, Scott]

A simple question, I hope. 

When you create a new slope map using the RASTER > TERRAIN ANALYSIS > SLOPE 
command, is the raster file created in degrees or percent slope?

Thanks,

Scott Madry
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Re: [Qgis-user] Snapping: Move Features vs Node Tool

[gam17]

Hi,
   may I suggest QAD plugin ? Similar to autocad...
bye
gam17

> A question. 
> 
> In an attempt to help a client I'm doing some data cleanup - which is
> good. I spend too much time talking and not enough doing. I need to
> snap points to the endpoints of lines. If I set snapping up and use the
> move features tool the point doesn't snap to the line. If I move the
> point using the node tool the point snaps to the line. 
> 
> I've been looking for an option or something to change. I'm not seeing
> one. Is this expected behavior? To me it would make more sense for both
> tools to snap data - but I may be missing something. If I add data, the
> data snaps as I would expect it. The good people I'm helping
> immediately started moving data and it didn't snap - and I've
> instructed them to use the node tool to make the edits. 
> 
> QGIS 2.18.9 - Linux
> 
> Thanks
> Randy
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Re: [Qgis-user] (no subject)

[Tudorache, Marian]

Hi Fred,

You include quite a lot of questions.
Changing layer color is done by styling.
You click right on the layer and choose properties. Go to the tab Style.
You can change the color of the features displayed in your layer, the 
transparency, unit of measurements etc.

Also I can't see a line of crosses, points opposite the nodes by the polygon  
so I don't know how to do this does any know how to correct this, sort it out?
I think you refers to the points which build a specific feature.
If you use vectorial layers there are three types: points, lines and polygon. 
You cannot have a layer with mixed types.
When you work with point layers it is simple. Each feature on the layer is a 
point.
When you work with lines you see the lines which connect the point defined by 
your clicks on the canvas.
If you want to visuals those  points you need to have the layer in edit mode 
and select a specific line feature, You can see the defined points by a small 
red x.
The same with polygon layer type.

Be aware the lines which are drawn manually are simple. They do not follow the 
contour of the earth like Great Circle, Rhumble lines. If you want to draw a 
great circle line you need create plugin or used one of the plugins which exist.
You have all kind of processing algorithm which can operate on you layers.

Changing the layer symbols.
You can change the symbol but not the layer type. Go to layer style as I 
explained above.

Do I answer to your questions?

Marian

From: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] On Behalf Of Fred 
Ralston
Sent: May-30-17 12:34 PM
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] (no subject)


Hi

I have been trying to learn how to use QGIS following the QGIS online tutorial. 
I am on lesson 6.2 part 2. Though I am still struggling to work out how to do 
this as my area of my places layer should be a different colour which I have 
tried to change but I don't know how as its shows as green on the tutorial but 
white at the moment does anyone know about this? .Also I can't see a line of 
crosses, points opposite the nodes by the polygon  so I don't know how to do 
this does any know how to correct this, sort it out?. Also each of the layers 
appear as symbols which I can't find,remember this being in the tutorial does 
anyone know how to change these layers so there are symbols.  I am basically 
just stuck on this lesson which I am finding very tricky and I badly need help 
with this. I have tried Stack Exchange but to no avail.

Kind Regards

Fred Ralston



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Re: [Qgis-user] (no subject)

[Stephen Bosch]

Hi Fred,

To help us help you, please

- formulate your question more clearly. What exactly are you trying to do?
What behaviour do expect? What behaviour are you getting?
- provide a link to the specific tutorial page you are following.
- let us know what version of QGIS you are using and on which operating
system.

Have you posted a question on Stack Exchange? If so, please provide a link.

Thanks

Stephen


On Tue, May 30, 2017 at 6:33 PM, Fred Ralston 
wrote:

> Hi
>
> I have been trying to learn how to use QGIS following the QGIS online
> tutorial. I am on lesson 6.2 part 2. Though I am still struggling to work
> out how to do this as my area of my places layer should be a different
> colour which I have tried to change but I don't know how as its shows as
> green on the tutorial but white at the moment does anyone know about this?
> .Also I can't see a line of crosses, points opposite the nodes by the
> polygon  so I don't know how to do this does any know how to correct this,
> sort it out?. Also each of the layers appear as symbols which I can't
> find,remember this being in the tutorial does anyone know how to change
> these layers so there are symbols.  I am basically just stuck on this
> lesson which I am finding very tricky and I badly need help with this. I
> have tried Stack Exchange but to no avail.
>
> Kind Regards
>
> Fred Ralston
>
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[Qgis-user] Apply symbology from other lyr to several lyrs using pyqgis

[Alejandro Chamizo de Castro]

hi colleagues,



I'm trying to apply the same symbology to several layer from a qml archive
using pyqgis.

I know how to do using arcpython but I wolud like to use QGIS.

Thanks a lot for the info.




-- 


[image: Logo]

Alejandro Chamizo de Castro

Analista SIG

*+34 653681823* · i...@agprecision.es

www.agprecision.es


[image: eco] No me imprimas si no es necesario. Protejamos el medio ambiente
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WEB: *http://www.gisland.es/ *



   Enviado con Mailtrack

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Re: [Qgis-user] crash on startup

[Stephen Bosch]

Hi Frank,

there seem to be problems with the Ubuntu runtime dependencies. I don't run
Ubuntu myself. If you can, try and see if it will let you use an older
version of qhull (2012.1, for example).

Otherwise have a look at this:
https://gis.stackexchange.com/questions/234010/qgis-fails-to-load/234031

Stephen

On Wed, May 31, 2017 at 10:01 PM, Frank Howell 
wrote:

> I get the following messages piped back to the terminal when I execute
> QGIS 2.18.9 with ubuntu dependencies.  I'm using Linux Mint 2.18.1 with
> Cinnamon x64 3.2.7 and kernal version 4.8.0-51 generic:
>
> frank@lil-jonny ~ $ qgis &
> [1] 43028
> frank@lil-jonny ~ $ Warning: loading of qgis translation failed
> [/usr/share/qgis/i18n//qgis_en_US]
> Warning: loading of qt translation failed [/usr/share/qt4/translations/
> qt_en_US]
> Warning: QCss::Parser - Failed to load file  "/style.qss"
> QInotifyFileSystemWatcherEngine::addPaths: inotify_add_watch failed: No
> such file or directory
> Warning: QFileSystemWatcher: failed to add paths:
> /home/frank/.qgis2//project_templates
> Warning: QLayout: Attempting to add QLayout "" to QgsPanelWidgetStack
> "mWidgetStack", which already has a layout
> QH6248 qh_lib_check: Incorrect qhull library called.  Caller uses
> reentrant Qhull while library is non-reentrant
> QH6249 qh_lib_check: Incorrect qhull library called.  Size of qhT for
> caller is 8184, but for library is 2896.
> QH6255 qh_lib_check: Cannot continue.  Library 'qhull 7.2.0 (2015.2
> 2016/01/18)' uses a dynamic qhT via qh_QHpointer (e.g., qhull_p.so)
>
> The package "qhull.bin" is installed.
>
> Any thoughts?
>
> Frank
>
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Re: [Qgis-user] lizmap configuration disappeared

[Nicolas Boisteault]

Hi,

You should ask your question here by clicking "new issue" : 
https://github.com/3liz/lizmap-web-client/issues



Le 01/06/2017 à 12:26, Otto Dassau a écrit :

Hi,

login as admin to lizmap client (3.0.4) I cannot see the menu entry "my
account" anymore to configure the client. I only can click on "exit". I must
have set some wrong hooks somewhere during another session :( and after that
the menu disapeared.

Can I change some values in a config file to be able to see the Lizmap
configuration as admin again?

Hope the qgis lists is the right place for such questions. I haven't found a
lizmap ml.

thanks a lot
Otto
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Re: [Qgis-user] Open a Project in Latest Version of QGIS

[DelazJ]

Hi,

Yes, simply open it in the new version. Not more. QGIS will inform you with
a message that it comes from an older version and once the file is saved,
no guarantee to reuse in the older version. So you can either save as new
file or do a backup of the project file before opening it in the new
version.

H.

2017-06-01 12:51 GMT+02:00 Finbar Gillen :

> Hi all,
>
>
>
> I have a project that is saved in a previous version of QGIS.
>
>
>
> Is there a way that I can open this project in the latest version of QGIS
> that I have installed?
>
>
>
> Finbar
>
>
>
> Finbar Gillen
>
> Data Analytics
>
> Ext: 2166
>
> Email: finbar.gil...@vhi.ie
>
>
>
> Vhi Group DAC (Vhi) is a holding company for insurance and healthcare
> services, which include Vhi Healthcare DAC, Vhi Insurance DAC, Vhi Health
> Services DAC and Vhi Investments DAC. Vhi Healthcare DAC trading as Vhi
> Healthcare and Vhi Insurance DAC trading as Vhi Insurance are regulated by
> the Central Bank of Ireland. Vhi Healthcare is tied to Vhi Insurance DAC
> for health insurance in Ireland which is underwritten by Vhi Insurance DAC.
> Vhi Healthcare is tied to Zurich Life Assurance plc for Vhi Life Term
> Insurance which is underwritten by Zurich Life Assurance plc. Vhi
> Healthcare is tied to Collinson Insurance Services Limited for MultiTrip
> Travel Insurance, Backpacker Travel Insurance and Vhi Dental Insurance
> which are underwritten by Great Lakes Insurance SE, UK branch and for Vhi
> Canada Cover and Vhi International Health Insurance which are underwritten
> by Astrenska Insurance Limited. For more information about the Vhi Group
> please go to: https://www.vhi.ie/about-vhi.
>
> Tá Vhi Group DAC (Vhi) ina chuideachta sealbhaíochta le haghaidh seirbhísí
> árachais agus seirbhísí cúram sláinte, lena n-áirítear Vhi Healthcare DAC,
> Vhi Insurance DAC, Vhi Health Services DAC agus Vhi Investments DAC.
> Déanann Banc Ceannais na hÉireann rialáil ar Vhi Healthcare DAC, ag trádáil
> dó mar Vhi Healthcare, agus ar Vhi Insurance DAC, ag trádáil dó mar Vhi
> Insurance. Tá Vhi Healthcare ceangailte le Vhi Insurance DAC le haghaidh
> árachas sláinte in Éirinn, rud atá frithgheallta ag Vhi Insurance DAC. Tá
> Vhi Healthcare ceangailte le Zurich Life Assurance plc le haghaidh árachais
> saoil in Éirinn, rud atá frithgheallta ag Zurich Life Assurance plc. Tá Vhi
> Healthcare ceangailte le Collinson Insurance Services Limited le haghaidh
> Árachas Taistil Ilturais agus Turasóirí Mála Droma agus Árachas
> Fiaclóireachta de chuid Vhi atá frithgheallta ag Great Lakes Insurance SE,
> UK branch agus le haghaidh Clúdach Cheanada de chuid Vhi agus Árachas
> Sláinte Idirnáisiúnta de chuid Vhi atá frithgheallta ag Astrenska Insurance
> Limited. Chun tuilleadh faisnéise a fháil faoi Ghrúpa Vhi, tabhair cuairt
> ar: https://www.vhi.ie/about-vhi.
>
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Re: [Qgis-user] Split features tool behavior

[Andreas Wicht]

Hi Bernhard,

> In my tests only the halves of the part that was split became new features,
> the rest of the mulit-part feature stays multipart, so all the islands would
> stay in the feature and you would only have to merge one half with the
> island multi polygon.

Yes, you are right.

>> For ArcGIS I don't exactly know. It just produces the result which I
>> expect.
>> The result is (using my sample data screenshots) 2 features. The right
>> features (which was cut off) and the left features (multipart polygon
>> of the other half + the part which is in this case a literal island).
>> How it exactly determines the correct relations of the parts, I can't
>> tell you.
>
> Maybe it depends on the direction the splitting line is drawn? This
> approach, however, would only work if the polygons are following the
> right-hand rule which is not the case for all providers [1].
>
> [1] http://postgis.net/docs/manual-2.3/ST_ForceRHR.html

In both GIS the line direction of the digitised splitting  line does
not influence the outcome.
After some more investigating in the ArcGIS behaviour I also found
some disturbing results. Here it can happen that parts on either side
of the splitting geometry are parts of a split off part. This might
actually be a right-hand-rule issue.

>> MapInfo has a more obvious approach. When you split a
>> multipart-feature with a line (2 vertices), it will extend the line to
>> the boundingbox-boundary, and split the feature with a polygon which
>> is constructed by the intersection of the bounding box and the
>> (extended) digitized line. Therefore the new feature which is created
>> will always be the portion which was covered by that polygon. The
>> other half of the feature remains a multipart feature and keeps all
>> parts which lie outside that splitting polygon.
>> When splitting a multipart polygon by a polyline (more than 2
>> vertices) it will always close the polyline automatically and
>> therefore construct the splitting polygon.
>
> If I have a bounding box and a splitting line there are two polygons
> possible: one to the left and one to the right of the splitting line. How
> does MapInfo decide which one to use? Or is this a user's choice? Maybe it's
> the same as I assumed for ArcInfo (right-hand rule).

Exactly. The result will be 2 polygons. The user can't decide. But he
does not have to in this case.
Each intersection of the original feature with one of those two halves
of the bounding box will end up being a multipart feature (given the
fact there are parts in both halves).
Same applies for the polyline split. It will automatically close the
polyline with the shortest connection and therefore you also have 2
"cutting polygons". One which is formed by the polyline and the other
would be the bbbox except the digitised cutting polygon.

Actually this is a quite straight forward approach to this matter,
which is also easy to understand for somebody who has never heard of
e.g. the right hand rule.

>> Chaining those 2 tools manually produces exactly the output I would
>> expect.
>> - I use "Split Parts" and receive the halves which form the invalid
>> geometry
>> - then I use "Split off one part and add it as a new feature" on the
>> part which I want to separate
>> - make sure the primary key is valid and
>> - done
>>
> this sounds like a straight workflow, although changing tools all the time
> seems a bit inconvenient :-)

Exactly. Therefore having this combined in one tool would be a nice addition.
You could have following input flow:
- select "insert name here" tool
- digitise splitting geometry
- split
- click on split part
- further attribute editing

Or use e.g. the MapInfo logic to that.

Andreas
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[Qgis-user] Open a Project in Latest Version of QGIS

[Finbar Gillen]

Hi all,

I have a project that is saved in a previous version of QGIS.

Is there a way that I can open this project in the latest version of QGIS that 
I have installed?

Finbar

Finbar Gillen
Data Analytics
Ext: 2166
Email: finbar.gil...@vhi.ie

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Services Limited for MultiTrip Travel Insurance, Backpacker Travel Insurance 
and Vhi Dental Insurance which are underwritten by Great Lakes Insurance SE, UK 
branch and for Vhi Canada Cover and Vhi International Health Insurance which 
are underwritten by Astrenska Insurance Limited. For more information about the 
Vhi Group please go to: https://www.vhi.ie/about-vhi.

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[Qgis-user] (no subject)

[Fred Ralston]

Hi

I have been trying to learn how to use QGIS following the QGIS online tutorial. 
I am on lesson 6.2 part 2. Though I am still struggling to work out how to do 
this as my area of my places layer should be a different colour which I have 
tried to change but I don't know how as its shows as green on the tutorial but 
white at the moment does anyone know about this? .Also I can't see a line of 
crosses, points opposite the nodes by the polygon  so I don't know how to do 
this does any know how to correct this, sort it out?. Also each of the layers 
appear as symbols which I can't find,remember this being in the tutorial does 
anyone know how to change these layers so there are symbols.  I am basically 
just stuck on this lesson which I am finding very tricky and I badly need help 
with this. I have tried Stack Exchange but to no avail.

Kind Regards

Fred Ralston
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[Qgis-user] lizmap configuration disappeared

[Otto Dassau]

Hi,

login as admin to lizmap client (3.0.4) I cannot see the menu entry "my
account" anymore to configure the client. I only can click on "exit". I must
have set some wrong hooks somewhere during another session :( and after that
the menu disapeared. 

Can I change some values in a config file to be able to see the Lizmap
configuration as admin again?

Hope the qgis lists is the right place for such questions. I haven't found a
lizmap ml.

thanks a lot
Otto
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[Qgis-user] Authenticated data layers - WFS / WMS differences

[Chris Buckmaster]

Hi

I have PostGIS and raster layers which are served via GeoServer 2.11 - they 
have a mixture of data authentication options with different user names and 
passwords using the GeoServer security options.

When adding WFS services in QGIS 2.18.9, the layers perform correctly, with 
only those accessible via certain roles / users displaying within the layer 
list when using the relevant username / password.

When trying to access restricted WMS / WMTS layers, I have noticed that all 
layers are appearing, even those that shouldn't be accessible via the user 
authentication I am using (and I seem to be able to add these to QGIS).

Are these differences to be expected between accessing WFS and WMS / WMTS 
services? Ideally I would only like to be able to see the data I have access to 
in QGIS - I am not sure if this is a QGIS or GeoServer question.

Thanks, Chris


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Re: [Qgis-user] Wrong result with Saga Raster calculator

[Eugenio Trumpy]

Hi Pedro,


thank you again.

If it helps, yesterday I tested the two operation in separate process,

I mean I performed Formula 1 and I saved the result as tif, the I run

the formula 2. I saw that there wasn't errors.

So I guess the problem is when I concatenate the computations in a single 
process.


Let me know if the developers find out a solution.

Best,

Eugenio



Da: Pedro Venâncio 
Inviato: mercoledì 31 maggio 2017 22:16
A: Eugenio Trumpy
Cc: qgis-user; qgis-developer
Oggetto: Re: [Qgis-user] Wrong result with Saga Raster calculator

Hi Eugenio,

I've created a sample processing model (attached), that works ok, except a 
small error in the result (decimals).

For instance:

Raster  ID  Pixel value

Z_top_res   a   1202,03510276

t_top_res   b   53,6123428345

topoc1  -182,584899902

SAGA Result 1   c   15,1783676147

SAGA Result 2   d   31,9437332153   Diff
Expected Result 1
15,1783679504   0,00335741
Expected Result 2
31,974087   0,0303540069

Formula
1   ifelse(c1>0,-(0.0065*c1-16),(0.0045*c1+16))
2   ifelse(a<500,0,((b-c)/a)*1000)

Using SAGA GUI there is no error.

Could this be because of some roundings in the input / output? (I'm sending for 
the developer's list also).

Thanks!

Best regards,
Pedro Venâncio



2017-05-31 10:56 GMT+01:00 Eugenio Trumpy 
>:


Hi Pedro,

thank you very much to have tested the computation with my test data!
You are right, I checked again the computation and actually it works.

However, I was using Saga raster calculation in a processing modeler, and one 
of the layer I share with you
is the resulting from a previous computation.

In other word the raster layer c=temp_recal.tif comes from a previous 
computation (raster calculator):
ifelse(a>0,-(0.0065*a-16),(0.0045*a+16))
where a is the layer attached, and hence c of the previous  formula is the 
resulting of this first computation.

E.


Da: Pedro Venâncio >
Inviato: mercoledì 31 maggio 2017 11:37
A: frippe12573; qgis-user
Oggetto: Re: [Qgis-user] Wrong result with Saga Raster calculator

Hi Eugenio,

The result with SAGA Raster Calculator seems ok here, on QGIS 2.18.9, SAGA 
2.3.2, both from OSGeo4W64 (result attached).

Z_top_res.tif have values from 724.403 to 1423.553, and so, the first condition 
is never true. Then, it always make ((b-c)/a)*1000, and the result seems ok to 
me.


Pedro



2017-05-31 10:19 GMT+01:00 frippe12573 
>:
Hi Paolo,

the raster have the same size and origin.
The pixels are precisely overlapped.

I tried also r.mapcalc, but I got a worst result.
Here the output of the log:
https://pastebin.com/jNyyzHgf

E.



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[QGIS-it-user] 2.18.9 comportamento con layer WFS

[Giovanni Pasini]

Ciao a tutti,
lavorando con layer WFS ho notato questa differenza tra QGis 2.14.11 e
2.18.9 (su debian testing):

- nella versione 2.14.11 aggiungevo un layer e selezionavo sia Cache
  Feature che Only request feature overlapping...

Il risultato era che mi scaricava le sole geometrie dell'area
visualizzata. Ok. Se poi aprivo la tabella attributi trovavo la tabella
con le sole geometrie interessate, in tempi rapidi.


- nella versione 2.18.9 non trovo più l'opzione Cache Feature, c'è però
  la colonna sql per filtrare i dati. Spunto Only request feature
  overlapping...

Il risultato è, nella visualizzazione, rapido come prima, ma se apro
la tabella attributi evidentemente elenca tutte le geometrie del
layer, con tempi, a seconda del caso, piuttosto lunghi.

E' un cambiamento di comportamento voluto? 

Nel caso, immagino che, per ottenere un risultato simile a quello
precedente si debba lavorare con il SQL query composer impostando un
filtro tipo: 
- solo le geometrie che intersecano l'attuale area visualizzata

però non sono riuscito a impostarlo. Avete suggerimenti?

Grazie, saluti,
Giovanni
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Re: [Qgis-user] Selecting displaced symbols

[Neumann, Andreas]

Hi Nyall, 

Can you please estimate the time it takes to finish this old commit? I
think it would be really nice to have in QGIS 3. It always bothered me
(and my users) that we can't click on the displaced symbols. 

How about QGIS server? Could your improvement also benefit QGIS server?
In the Web-GIS it is particularly hard to understand for users, why they
can't pick on displaced symbols. 

Maybe we can find someone to finance this improvement. 

Thanks, 

Andreas 

On 2017-06-01 01:20, Nyall Dawson wrote:

> On 30 May 2017 at 19:11, Neumann, Andreas  wrote: 
> 
>> Hi Martin,
>> 
>> As far as I know, picking is totally independent of the rendering. So the
>> "Info tool" doesn't know about the displacement renderer. I know it is not
>> ideal, but it is a technical limitation and there are no known workarounds.
> 
> Well - there's this half finished commit I wrote but never merged:
> https://github.com/nyalldawson/QGIS/commit/2405c9cc2c9d07bd0975d60ce36db5c5e8d8b612
> 
> I can't remember exactly why I didn't complete this. I think it was
> written during feature freeze once and I never got around to verifying
> that it didn't cause regressions in the rendering speed after freeze
> was lifted. From memory it worked well for info tool and rotate point
> symbol tool.
> 
> From the commit message:
> 
> "Register rendered point features into a spatial index so that we can
> later retrieve features by their actual rendered location.
> (The rendered location may be different in numerous circumstances, eg
> when using the displacement renderer, or when marker symbols
> have an offset set)
> This index could then be used to later retrieve the features for a
> specific canvas coordinate, for use eg in identify tool, rotate point
> symbols, etc."
> 
> Theoretically this could be cleaned up, finished off and tested, and
> then later extended to apply to selections also.
> 
> Nyall___
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Re: [Qgis-user] Split features tool behavior

[Bernhard Ströbl]

ging step.


BTW: We should agree on common terms; these are the terms QGIS uses AFAIK: a
feature is a dataset, i.e. one row in the table; it can either have one
geometry or several geometries as spatial representation (or none but that's
of no interest here). If it has several geometries it is called a multi-part
feature, each individual geometry is called a part then. A polygon is a type
of geometry; if it is a multi-part polygon, each part is a polygon in itself
(therefore I tried to avoid "polygon" altogether and used "feature" and
"part" instead to be clear). An island is a hole in a single polygon, QGIS
calls it "ring". In DigitizingTools I use "gap" for a space surrounded by
polygon features but without being part of a polygon itself.


I hope I managed to follow that now :)


I was just puzzled by you using "island" in your last post, thinking you 
were talking about geometries and not the real world :-)





The idea behind "Split off one part and add it as a new feature" is that you
cannot use "Split features" to extract a whole part (workaround would be to
apply "Split features" to the part and merge the two resulting new features
into one, but that's not intuitive :)


Chaining those 2 tools manually produces exactly the output I would expect.
- I use "Split Parts" and receive the halves which form the invalid geometry
- then I use "Split off one part and add it as a new feature" on the
part which I want to separate
- make sure the primary key is valid and
- done


this sounds like a straight workflow, although changing tools all the 
time seems a bit inconvenient :-)


Bernhard



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