[Qgis-developer] New feature's needed, create geometry from attribute

Tue Jul 2 00:12:22 PDT 2013

 Perhaps you could be interested in our plugin:
RT QSpider.

It create a shapefile from a dbf with coordinate on two field int or
textual.

The plugin is actually for 1.8 only, bt we plan early to evolve to qgis 2.0

Regards,

On 01/07/2013 09:48, HAUBOURG wrote:

 Hi all, let me precise the need:****

Numerical vertex edit and wkt plugin are usefull when dealing with one
geometry. ****

Geom calculation with field update can create eventually a WKB, but it’s
absolutely not user friendly, and there is actually no way to load a layer
from that in a file based layer. ****

** **

Think of a user getting a excel or calc spreadsheet with XY inside. The
only way to import it directly as a spatial layer (not talking about using
sqlite or postgis.. too complex for common users not even aware of data
source types) is too export it to csv and import it with delimited text
plugin. ****

That is always a pain since no tool exports csv in the same way when
dealing with numerical / text types, decimal separators… ****

XLS, calc, dbf do type correctly fields and avoid any file conversion (if
no formula or problem in field names today). Importing directly the
datasource, and being able to spatialize it afterwards , only if needed
(join pure attribute data is also a use case), would be nice. ****

** **

So is the need for my corp.****

My question : I would like to avoid data duplication (again) , is that
feasible using pluginlayerType in python API todayu, or do I need some core
modifications ? Of course, that need to be reloaded correctly with a
project file. ****

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Régis****

** **

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** **

 ****

Cordialement,****

Régis Haubourg****

----------------------------------------------------------------------
--------------
Régis Haubourg

Administrateur de données Géographiques
Département des Systèmes d'Information (DCSI)
Agence de l'eau Adour Garonne
90 rue du Férétra,
31078 Toulouse Cedex4
Tél: 05 61 36 82 58
Mail: regis.haubourg at eau-adour-garonne.fr****

[image: cid:image002.jpg at 01CE5BAA.92C70ED0]http://www.eau-adour-garonne.fr**
**

* *

Accédez aux données sur l'eau  :****

http://adour-garonne.eaufrance.fr/ ****

** **

*De :* kimaidou [mailto:kimaidou at gmail.com <kimaidou at gmail.com>]
*Envoyé :* dimanche 30 juin 2013 22:00
*À :* Anita Graser
*Cc :* Alexander Bruy; qgis-developer; HAUBOURG
*Objet :* Re: [Qgis-developer] New feature's needed, create geometry from
attribute****

** **

Hi****

What about using the field calculator ? I think I have seen a method in the
"geometry" tools : something like geomfromwkt ? If needed, we could simply
add a way to modifiy the features geometry with the field calculator, and
it will do the trick. ****

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** **

2013/6/30 Anita Graser <anitagraser at gmx.at>****

The Quick WKT plugin does something very similar.****

Anita****

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On Sun, Jun 30, 2013 at 3:06 PM, Alexander Bruy <alexander.bruy at gmail.com>
wrote:****

Hi, what about NumericalVertexEdit plugin? If I understand correctly, it
do what you need.

2013/6/30 Régis Haubourg <regis.haubourg at eau-adour-garonne.fr>:****

> Hi all,
> After some training courses here, a very common use case is not satisfied
> easily:
>
> The only entry to create geometry from text (XY or WKT) is the delimited
> text plugin.
> It appears that having a separate fonction "create point" like in Mapinfo
or
> Arcgis would be really handy, and could avoid the need of csv import.
>
> I was thinking of making a plugin for this, but I'm wondering what is the
> best approach.
>  1- duplicate layer into a memory layer. Easy, requires MemoryLayerSaver
to
> make data persistent, is not dynamic with datasource.
>  2- create a pluginLayer? I'm not sure it will do what I need. I would
like
> the project to keep a reference to the datasource (xls, whatever ogr/
> postgres/ sqlite/ spatialite) and replace or create geometry on load by
> reading XY columns or WKT column.
>
> Is that feasable in a plugin,  as a proof of concept, or does it require
> core classes modifications (C++ work , so I won't do it by myself)
>
> Thanks for your tips,
> Régis

--****

Alexander Bruy****

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