Re: [Qgis-user] Linear referencing in QGIS

[Régis Haubourg]

Hi All,
I've been using linear referencing extensively here to produce european
reference datasets of water bodies. Postgis works just fine and fast.
What I have been missing, and average users probably miss that too, is:

 - A tool to "calibrate" a route from data, points, or lines:
Currently LRS can do that only with point data. Postgis misses also a
simplified function.
 That "route generation" tool should have tolerance options and do
something like a grass clean and auto arc orienting, and must be able to
generate route from points or lines, or multilines.


- A generic graphical "m" or "z" picker editor widget:
Use case: you need to create linear or point events against a route system,
just clicking on a route and getting X,Y, M,Y and storing it in attribute
table . I can imagine along the line edit widget, a small button (like a
color picker) , once pressed allow the user to click on the map. Question
is, how to confirm wich geometry event has been clicked in case of
proximity or superposition. One idea could be to have a dropdown list box
of values under the click, displaying event identifier and m / z value.

I'd be happy to discuss that with you all.


Cheers
Régis



2016-09-07 16:51 GMT+02:00 Neumann, Andreas :

> Hi,
>
> Yes, I know about LR expressions in the current master versions.
>
> So one could visualize the events table through a virtual geometry column
> - would that work?
>
> I will forward all this information to my friend.
>
> Greetings,
>
> Andreas
>
> On 2016-09-07 15:34, Matthias Kuhn wrote:
>
> Hi Andreas,
>
> In QGIS 2.18 / QGIS 3.0 this should be possible via expressions:
>
> https://github.com/qgis/QGIS/commit/e110ba7d54b0ac7d3f63e8ed7eaebb
> 2845f9f38c
>
> Best regards
> Matthias
>
> On 09/07/2016 02:24 PM, Neumann, Andreas wrote:
>
> Hi,
>
> A friend of mine asked me if QGIS can do linear referencing - e.g.
> symbolizing road data speed limits along a road, lets say from km 0 to
> 0.76 there is a limit of 50 km/h, from 0.76 to 1.23 there is 80 km/h
> limit, etc.
>
> The idea is to symbolize these road segments without having to actually
> split the data into bits. And hopefully without having to generate
> derived tables that have no link to the original data.
>
> Is QGIS able to do this, perhaps with a plugin?
>
> Thanks for any hints,
>
> Andreas
>
>
>
>
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-- 
Régis Haubourg

Attention, changement d'adresse mail!
Mon adresse principale devient désormais regis.haubourg at gmail.com
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[Qgis-user] Problems with the construction of tiles to leaflet

[massimiliano crea]

I am creating a map that I have to export tiles to leaflet. I tried first with 
qtiles but the labels do not fit between the various tiles, then I tried with 
TileMill to load the layers but exporting Mbtiles I noticed that the areas 
referred to zoom does not correspond with each other, and between qtiles 
mbtiles. Why? What interests me is to obtain the coordinates used by Qtiles. 
How do I get tiles with the same coordinates?Can you help out?
Thank you
Massimiliano Crea___
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Re: [Qgis-user] Linear referencing in QGIS

[Neumann, Andreas]

Hi, 

Yes, I know about LR expressions in the current master versions. 

So one could visualize the events table through a virtual geometry
column - would that work? 

I will forward all this information to my friend. 

Greetings, 

Andreas 

On 2016-09-07 15:34, Matthias Kuhn wrote:

> Hi Andreas,
> 
> In QGIS 2.18 / QGIS 3.0 this should be possible via expressions:
> 
> https://github.com/qgis/QGIS/commit/e110ba7d54b0ac7d3f63e8ed7eaebb2845f9f38c
> 
> Best regards
> Matthias
> 
> On 09/07/2016 02:24 PM, Neumann, Andreas wrote: 
> 
>> Hi,
>> 
>> A friend of mine asked me if QGIS can do linear referencing - e.g.
>> symbolizing road data speed limits along a road, lets say from km 0 to
>> 0.76 there is a limit of 50 km/h, from 0.76 to 1.23 there is 80 km/h
>> limit, etc.
>> 
>> The idea is to symbolize these road segments without having to actually
>> split the data into bits. And hopefully without having to generate
>> derived tables that have no link to the original data.
>> 
>> Is QGIS able to do this, perhaps with a plugin?
>> 
>> Thanks for any hints,
>> 
>> Andreas
>> 
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Re: [Qgis-user] Linear referencing in QGIS

[Matthias Kuhn]

Hi Andreas,

In QGIS 2.18 / QGIS 3.0 this should be possible via expressions:

https://github.com/qgis/QGIS/commit/e110ba7d54b0ac7d3f63e8ed7eaebb2845f9f38c

Best regards
Matthias

On 09/07/2016 02:24 PM, Neumann, Andreas wrote:
> Hi,
> 
> A friend of mine asked me if QGIS can do linear referencing - e.g.
> symbolizing road data speed limits along a road, lets say from km 0 to
> 0.76 there is a limit of 50 km/h, from 0.76 to 1.23 there is 80 km/h
> limit, etc.
> 
> The idea is to symbolize these road segments without having to actually
> split the data into bits. And hopefully without having to generate
> derived tables that have no link to the original data.
> 
> Is QGIS able to do this, perhaps with a plugin?
> 
> Thanks for any hints,
> 
> Andreas
> 
>  
> 
> 
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Re: [Qgis-user] Linear referencing in QGIS

[Paolo Cavallini]

Il 07/09/2016 14:47, Neumann, Andreas ha scritto:
> Hi Paolo,
> 
> Thanks - it looks quite powerful. And yes - they would use it with
> Postgis data.
> 
> Can one also create point or linear events interactively in QGIS? I did
> not see this in the description of the plugin. I see that one can query
> measurements in the "Localize tab" and that an events table can be
> defined and visualized (in memory layer) - which is quite cool. But can
> one also interactively edit the events table by clicking along a route
> and thus filling the events table?

I have done this with plain PostGIS and a few forms, with some
limitations however. We have been discussing with some devs about
possibilities of improvement.
All the best.
-- 
Paolo Cavallini - www.faunalia.eu
QGIS & PostGIS courses: http://www.faunalia.eu/training.html
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Re: [Qgis-user] Linear referencing in QGIS

[Neumann, Andreas]

Hi Paolo, 

Thanks - it looks quite powerful. And yes - they would use it with
Postgis data. 

Can one also create point or linear events interactively in QGIS? I did
not see this in the description of the plugin. I see that one can query
measurements in the "Localize tab" and that an events table can be
defined and visualized (in memory layer) - which is quite cool. But can
one also interactively edit the events table by clicking along a route
and thus filling the events table? 

Thanks,
Andreas 

On 2016-09-07 14:28, Paolo Cavallini wrote:

> Il 07/09/2016 14:24, Neumann, Andreas ha scritto: 
> 
>> Hi,
>> 
>> A friend of mine asked me if QGIS can do linear referencing - e.g.
>> symbolizing road data speed limits along a road, lets say from km 0 to
>> 0.76 there is a limit of 50 km/h, from 0.76 to 1.23 there is 80 km/h
>> limit, etc.
>> 
>> The idea is to symbolize these road segments without having to actually
>> split the data into bits. And hopefully without having to generate
>> derived tables that have no link to the original data.
>> 
>> Is QGIS able to do this, perhaps with a plugin?
> 
> Yes:
> http://plugins.qgis.org/plugins/lrs/
> Best if using PostGIS though.
> All the best.

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Re: [Qgis-user] Linear referencing in QGIS

[Paolo Cavallini]

Il 07/09/2016 14:24, Neumann, Andreas ha scritto:
> Hi,
> 
> A friend of mine asked me if QGIS can do linear referencing - e.g.
> symbolizing road data speed limits along a road, lets say from km 0 to
> 0.76 there is a limit of 50 km/h, from 0.76 to 1.23 there is 80 km/h
> limit, etc.
> 
> The idea is to symbolize these road segments without having to actually
> split the data into bits. And hopefully without having to generate
> derived tables that have no link to the original data.
> 
> Is QGIS able to do this, perhaps with a plugin?

Yes:
http://plugins.qgis.org/plugins/lrs/
Best if using PostGIS though.
All the best.
-- 
Paolo Cavallini - www.faunalia.eu
QGIS & PostGIS courses: http://www.faunalia.eu/training.html
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[Qgis-user] Linear referencing in QGIS

[Neumann, Andreas]

Hi, 

A friend of mine asked me if QGIS can do linear referencing - e.g.
symbolizing road data speed limits along a road, lets say from km 0 to
0.76 there is a limit of 50 km/h, from 0.76 to 1.23 there is 80 km/h
limit, etc. 

The idea is to symbolize these road segments without having to actually
split the data into bits. And hopefully without having to generate
derived tables that have no link to the original data. 

Is QGIS able to do this, perhaps with a plugin? 

Thanks for any hints, 

Andreas

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