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

[Nathan Woodrow]

The Add Delimited Text Layer import tool also has a watch file option

http://i.imgur.com/K1BL1zo.png

However this will only work for file based layers.  I would like something
that would work for any type, PostGIS, MS SQL, etc.

- Nathan


On Mon, Jul 1, 2013 at 6:31 PM, Vincent Picavet <vincent.ml at oslandia.com>wrote:

> Hi Regis, all,
>
> You can also open a CSV with X.Y coordinates with a VRT file describing the
> geometry component. You could automatically generate and load such a VRT
> with
> an interface to guide the user.
>
> Vincent
>
> Le lundi 1 juillet 2013 09:48:00, HAUBOURG a écrit :
> > 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.
> >
> > Régis
> >
> >
> >
> >
> > Cordialement,
> > Régis Haubourg
> >
> ---------------------------------------------------------------------------
> > --------- Régis Haubourg
> >
> > Administrateur de données Géographiques
> > Département des Systèmes d'Information (DCSI)
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> > Mail:
> > regis.haubourg at eau-adour-garonne.fr<mailto:
> regis.haubourg at eau-adour-garonn
> > e.fr> [cid:image002.jpg at 01CE5BAA.92C70ED0]
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> >
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> >
> > De : kimaidou [mailto: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.
> >
> >
> > 2013/6/30 Anita Graser <anitagraser at gmx.at<mailto:anitagraser at gmx.at>>
> > The Quick WKT plugin does something very similar.
> > Anita
> >
> > On Sun, Jun 30, 2013 at 3:06 PM, Alexander Bruy
> > <alexander.bruy at gmail.com<mailto: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<mailto: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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