[Qgis-user] Evaluation of data in two shapefiles

[Anke zur Gölden]

Hello,

first of all thank you for taking me to the list.

I have the following issue i would like to solve in QGIS.

I have two different vector based layers. Both layers are
nearly similiar and have coordinates, attributes etc. and
based on LineString

In the first layer i would like to select a specific LineString
and in the second layer all the data are compared to the
selected LineString and the results shown in the table.

example:
I select in the layer 1 a LineString element with coordinates
and the attribute „color“ = red.
Now all the LineStrings in the Layer 2 shall be checked if
the same color is set or not and so

I hope my general question is clear so far.

Is that possible in QGIS and if yes how the easiest way to do?

Anke

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Re: [Qgis-user] Join multiple Linestrings to single Linestring

[David J. Bakeman]

On 04/18/2017 02:17 AM, fuenfer-koenigstein.benja...@swm.de wrote:
> Hi there,
>
> I want to merge multiple linestrings with same start/endpoint to a single 
> linestring (all lines within one layer). As I use a PostGIS source with 
> geometry type linestring, it is important that the new geometry is still 
> linestring and not multilinestring type. "Merge selected features" tool and 
> "JOIN" in QAD-Plugin both create multilinestrings. Has anyone an idea how to 
> directly merge into linestring or how to change geometry type after merging? 
> Thanks for your suggestions!
I'm not sure I completely understand what you want but you could run
multipart to singleparts from the Vector/Geometry Tools menu on the
multilinestring layer to generate a layer with just linestrings.
>
> Best regards
>
> Benjamin
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[Qgis-user] QGIS Loads Black Screen For PostGIS Out-Db Raster Data

[Osahon Oduware]

Hi All,

I have an out-db raster on PostGIS which I tried to load in QGIS (v
2.14.12-Essen) utilizing the DB Manager to establish a connection. I could
view the raster table, but when I try to "Add to canvas" it displays a
black screen instead of the raster image.

I would be glad if someone could help me to resolve this.
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[Qgis-user] General question about best approach

[phi73]

Hello

i have a very general question:
I am becoming more and more familiar with QGIS and thinking about to run
some own analysis.
Now i am not sure how to go on the best.

The key issue is that i have data in two different layers (a link with an 
attribute)
and i want to compare them (if similar or not or any other mathematical 
calculation)
and show the result in a table or sth like that.

So how to start the best with so that i can improve my knowledge step by step
in this way.

Thanks
pat

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Re: [Qgis-user] LRS (Linear Referencing System Plugin)

[Werner Macho]

Hi!

I never got that deep into LRS but to my knowledge you can include
points that are "near" a line and reference them.
While Qchainage is strictly bound to measure distances along a feature.


On Tue, Apr 18, 2017 at 2:18 PM, Tyler Veinot  wrote:
> Werner;
> I thought the LRS plugin was an upgrade from QChainage, did I get that
> reversed?
> Tyler
>
> On Tue, Apr 18, 2017 at 9:12 AM, Werner Macho 
> wrote:
>>
>> Hi!
>>
>> Just out of curiosity - would the qchainage plugin be enough for you?
>>
>> regards
>> Werner
>>
>> On Tue, Apr 18, 2017 at 2:10 PM, Tyler Veinot 
>> wrote:
>> > Hello;
>> > Has anyone used the Linear Reference System Plugin in QGIS aka LRS
>> > Plugin?
>> > I would like to display events as points and lines based on measured
>> > distances along a linear feature. I can get lines working with an event
>> > table with; Route_ID, Measure_From, Measure_To fields but I cannot seem
>> > to
>> > display point events. I tried Route_ID and Measure fields and Route_ID
>> > with
>> > the Measure_To and Measure_From valves as the same number but no go.
>> > Anyone using LRS to display point events?
>> > Tyler
>> >
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>
>
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Re: [Qgis-user] LRS (Linear Referencing System Plugin)

[Tyler Veinot]

Werner;
I thought the LRS plugin was an upgrade from QChainage, did I get that
reversed?
Tyler

On Tue, Apr 18, 2017 at 9:12 AM, Werner Macho 
wrote:

> Hi!
>
> Just out of curiosity - would the qchainage plugin be enough for you?
>
> regards
> Werner
>
> On Tue, Apr 18, 2017 at 2:10 PM, Tyler Veinot 
> wrote:
> > Hello;
> > Has anyone used the Linear Reference System Plugin in QGIS aka LRS
> Plugin?
> > I would like to display events as points and lines based on measured
> > distances along a linear feature. I can get lines working with an event
> > table with; Route_ID, Measure_From, Measure_To fields but I cannot seem
> to
> > display point events. I tried Route_ID and Measure fields and Route_ID
> with
> > the Measure_To and Measure_From valves as the same number but no go.
> > Anyone using LRS to display point events?
> > Tyler
> >
> > ___
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> > Qgis-user@lists.osgeo.org
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> > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
>
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Re: [Qgis-user] LRS (Linear Referencing System Plugin)

[Werner Macho]

Hi!

Just out of curiosity - would the qchainage plugin be enough for you?

regards
Werner

On Tue, Apr 18, 2017 at 2:10 PM, Tyler Veinot  wrote:
> Hello;
> Has anyone used the Linear Reference System Plugin in QGIS aka LRS Plugin?
> I would like to display events as points and lines based on measured
> distances along a linear feature. I can get lines working with an event
> table with; Route_ID, Measure_From, Measure_To fields but I cannot seem to
> display point events. I tried Route_ID and Measure fields and Route_ID with
> the Measure_To and Measure_From valves as the same number but no go.
> Anyone using LRS to display point events?
> Tyler
>
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[Qgis-user] LRS (Linear Referencing System Plugin)

[Tyler Veinot]

Hello;
Has anyone used the Linear Reference System Plugin in QGIS aka LRS Plugin?
I would like to display events as points and lines based on measured
distances along a linear feature. I can get lines working with an event
table with; Route_ID, Measure_From, Measure_To fields but I cannot seem to
display point events. I tried Route_ID and Measure fields and Route_ID with
the Measure_To and Measure_From valves as the same number but no go.
Anyone using LRS to display point events?
Tyler
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Re: [Qgis-user] New layer from current view

[Phil (The Geek) Wyatt]

Hi Pat,

 

· select just the parts of the current layer that you want to save 
(CTRL and select the parts)

· right click on the layer name and save as

· tick the box for 'save only selected features'

 

Cheers - Phil

 

From: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] On Behalf Of 
ph...@gmx.de
Sent: Tuesday, April 18, 2017 7:23 PM
To: QGIS User List
Subject: [Qgis-user] New layer from current view

 

Hello 

 

how can i create a new layer from current view.

I.e. e layer which is just a part of the original layer?

 

thx

pat

 

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Re: [Qgis-user] New layer from current view

[Fuenfer-Koenigstein.Benjamin]

Hi Pat,

do you want to clip your layer to current canvas extend? You can do that by 
creating a new (temporary) polygon layer, create a rectangle that represents 
your canvas extend and use Vector -> Geoprocessing Tools -> Intersection. Maybe 
not the most elegant way but should work. Alternatively you can do some 
scripting that uses current canvas extend.

Regards
Benjamin

Von: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] Im Auftrag von 
ph...@gmx.de
Gesendet: Dienstag, 18. April 2017 11:23
An: QGIS User List
Betreff: [Qgis-user] New layer from current view

Hello

how can i create a new layer from current view.
I.e. e layer which is just a part of the original layer?

thx
pat

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Re: [QGIS-it-user] Non abbassiamo la guardia

[Luca Mandolesi]

Se ho capito bene hanno proprio azzerato le risorse per le licenze e sono
migrati non considerando il fatto di investire sull'opensource...è il punto
cruciale del capire FREE != GRATIS.

Ho sollecitato più volte l'argomento ma senza esiti. L'unico risultato è
stato portarli verso QGis e ci sono voluti 10 anni.

Ciao
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[Qgis-user] Join multiple Linestrings to single Linestring

[Fuenfer-Koenigstein.Benjamin]

Hi there,

I want to merge multiple linestrings with same start/endpoint to a single 
linestring (all lines within one layer). As I use a PostGIS source with 
geometry type linestring, it is important that the new geometry is still 
linestring and not multilinestring type. "Merge selected features" tool and 
"JOIN" in QAD-Plugin both create multilinestrings. Has anyone an idea how to 
directly merge into linestring or how to change geometry type after merging? 
Thanks for your suggestions!

Best regards

Benjamin
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[Qgis-user] New layer from current view

[phi73]

Hello

how can i create a new layer from current view.
I.e. e layer which is just a part of the original layer?

thx
pat

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Re: [QGIS-it-user] Non abbassiamo la guardia

[Paolo Cavallini]

Il 18/04/2017 08:05, Luca Mandolesi ha scritto:
> Provincia 20.000 € ogni 3 anni di licenze per le basi Gis  io 5000
> euri per la stessa architettura in 10 anni... dopo 10 anni che glielo
> avevo proposto pare stiano migrando a Qgis ... 

Reinvestendoci una parte di quei 20k?
Saluti.
-- 
Paolo Cavallini - www.faunalia.eu
QGIS & PostGIS courses: http://www.faunalia.eu/training.html
https://www.google.com/trends/explore?date=all=IT=qgis,arcgis
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Re: [QGIS-it-user] agganciare database vb ad qgis

[Luca Mandolesi]

Che male che vada ti porti i dati su libreoffice e ti fai un report per le
tabelle lineari... oppure scriptino python e reportlab e il.pdf è pronto!!

Il 17 apr 2017 7:06 PM, "Luca Lanteri"  ha scritto:

> Ciao matteo.
> Se vuoi integrare il tuo database in qgis ti conviene quasi sicuramente
> passare ad un altra soluzione rispetto ad access: postgres/postgis o
> sqlite/spatialite sono sicuramente i primi da valutare.
> Utilizzerei gli odbc proprio solo come ultima risorsa o solo se per
> qualche motivo non vuoi o puoi mettere le mani sul database access.
> Ormai qgis ha tutto quello che ti può servire per gestire la parte di
> form. L'unica cosa su cui potresti trovare ancora qualche limite è in parte
> la reportistica.
>
> Luca
>
> Il 16 apr 2017 18:03, "girarsi"  ha scritto:
>
> Il 16/04/2017 16:46, matteo.collimedag...@virgilio.it ha scritto:
> > Buona Pasqua a tutti!!!
> > Voglio agganciare un database realizzato trabite Visualbasic a Qgis.
> > Avete idee a tal proposito, credo che per fare ciò lo si debba
> > esportare da Visualbasic ad un altro linguaggio compatibile con Qgis. A
> > quanto sembra questo software non supporta i database realizzati con
> > access.
> >
> > Grazie,
> >
> > Matteo
> >
>
> Non ho idea se funziona comunque con Qgis versione 2, ho trovato questo
> commento in inglese:
>
> https://gis.stackexchange.com/a/73160
>
>
> --
> Simone Girardelli
> _|_|_|_|_|_|_|_|_|_
> |_|_|_|_|_|_|_|_|_|_|
>
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Re: [QGIS-it-user] Non abbassiamo la guardia

[Luca Mandolesi]

Provincia 20.000 € ogni 3 anni di licenze per le basi Gis  io 5000 euri
per la stessa architettura in 10 anni... dopo 10 anni che glielo avevo
proposto pare stiano migrando a Qgis ...

My2Cents
Luca

Il 17 apr 2017 5:21 PM, "Marco Spaziani"  ha
scritto:

> ...così, ...tanto perchè fa bene, ogni tanto, pensare a come potrebbero
> essere le cose senza l'open source.
> http://www.ilfattoquotidiano.it/premium/articoli/ostaggi-
> di-microsoft-lo-stato-si-e-consegnato-alla-multinazionale/
>
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>
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