[GRASS-user] interactive multiple selection

[Vincent Bain]

Hello,
considering a vector map, do you know a simple way to perform multiple
selections (e.g. highlighting a set of polygons) interactively either on
the display (tcltk or wxpython) or through a X monitor ? the aim in the
end is to update database records on the basis of a cat list.

I tried the addon v.digatt but I can't run it correctly (I think a
possible reason is my vector is linked to a pg db driver, and the module
was tested only with dbf driver).

Thank you,
Vincent.

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Re: [GRASS-user] interactive multiple selection

[Markus Neteler]

On Wed, Jan 21, 2009 at 9:25 AM, Vincent Bain  wrote:
> Hello,
> considering a vector map, do you know a simple way to perform multiple
> selections (e.g. highlighting a set of polygons) interactively either on
> the display (tcltk or wxpython) or through a X monitor ? the aim in the
> end is to update database records on the basis of a cat list.
>
> I tried the addon v.digatt but I can't run it correctly (I think a
> possible reason is my vector is linked to a pg db driver, and the module
> was tested only with dbf driver).

Coudl this help?

d.extract help

Description:
 Selects and extracts vectors with mouse into new vector map.

It's not perfect but maybe a starter.

Markus
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Re: [GRASS-user] interactive multiple selection

[Vincent Bain]

Thank you Markus,

I tried several methods like d.extract, or
d.where | v.what map=zonpi > test and extracting cat values from the
test file. Now I am wondering if it is worth (let's better say realistic
given my skills) to try and write a custom module, inspired from
v.digatt.

As I already had a little experience in perl and wxwidget (frontend for
data capture in postgres database) I would appreciate later on to
involve in writing a python add-on, but like everyone, my principal
ennemy is the lack of time !

Beside data storing, treatment, analysis, I think it would be great to
improve data *production* tools, and it's what I would like to
contribute.

Vincent.



Le mercredi 21 janvier 2009 à 09:32 +0100, Markus Neteler a écrit :
> On Wed, Jan 21, 2009 at 9:25 AM, Vincent Bain  wrote:
> > Hello,
> > considering a vector map, do you know a simple way to perform multiple
> > selections (e.g. highlighting a set of polygons) interactively either on
> > the display (tcltk or wxpython) or through a X monitor ? the aim in the
> > end is to update database records on the basis of a cat list.
> >
> > I tried the addon v.digatt but I can't run it correctly (I think a
> > possible reason is my vector is linked to a pg db driver, and the module
> > was tested only with dbf driver).
> 
> Coudl this help?
> 
> d.extract help
> 
> Description:
>  Selects and extracts vectors with mouse into new vector map.
> 
> It's not perfect but maybe a starter.
> 
> Markus
> 

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Re: [GRASS-user] interactive multiple selection

[Michael Barton]

On Jan 21, 2009, at 7:27 AM,  wrote:


Date: Wed, 21 Jan 2009 12:21:57 +0100
From: Vincent Bain 
Subject: Re: [GRASS-user] interactive multiple selection
To: GRASS user list 
Message-ID: <1232536917.12409.37.ca...@vincent-desktop>
Content-Type: text/plain; charset=UTF-8

Thank you Markus,

I tried several methods like d.extract, or
d.where | v.what map=zonpi > test and extracting cat values from the
test file. Now I am wondering if it is worth (let's better say  
realistic

given my skills) to try and write a custom module, inspired from
v.digatt.

As I already had a little experience in perl and wxwidget (frontend  
for

data capture in postgres database) I would appreciate later on to
involve in writing a python add-on, but like everyone, my principal
ennemy is the lack of time !

Beside data storing, treatment, analysis, I think it would be great to
improve data *production* tools, and it's what I would like to
contribute.

Vincent.


Vincent,

Very much related to this, please see my suggestions for updates to  
the GRASS query functions. Most should be relatively minor changes,  
but would make querying much easier. And it would make it easier to  
implement GUI wrappers for interactive querying.


<http://grass.osgeo.org/wiki/GRASS_6.3_Feature_Plan> "Updates to  
vector querying "


Thanks much for your interest.

Michael
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Re: [GRASS-user] interactive multiple selection

[Vincent Bain]

> Very much related to this, please see my suggestions for updates to  
> the GRASS query functions. Most should be relatively minor changes,  
> but would make querying much easier. And it would make it easier to  
> implement GUI wrappers for interactive querying.
> 
>  "Updates to  
> vector querying "

OK, good perspective !

Concerning the GUI wrapping of commands such as v.what or v.select,
will it imply the ability to query directly within the display window ?

Vincent.

> 
> Thanks much for your interest.

> 
> Michael
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Re: [GRASS-user] interactive multiple selection

[Michael Barton]

On Jan 21, 2009, at 11:05 PM,   
wrote:



Date: Wed, 21 Jan 2009 18:45:40 +0100
From: Vincent Bain 
Subject: Re: [GRASS-user] interactive multiple selection
To: GRASS user list 
Message-ID: <1232559940.6769.10.ca...@vincent-desktop>
Content-Type: text/plain


Very much related to this, please see my suggestions for updates to
the GRASS query functions. Most should be relatively minor changes,
but would make querying much easier. And it would make it easier to
implement GUI wrappers for interactive querying.

<http://grass.osgeo.org/wiki/GRASS_6.3_Feature_Plan> "Updates to
vector querying "


OK, good perspective !

Concerning the GUI wrapping of commands such as v.what or v.select,
will it imply the ability to query directly within the display  
window ?


Yes. That's the idea. Martin Landa already has tried to implement this  
to some extent in the new wxPython GUI. But it involves a lot of  
workarounds for inadequacies in the GRASS vector querying. These  
updates to querying modules would make this easier and more robust.


Michael 
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Re: [GRASS-user] interactive multiple selection

[Vincent Bain]

> Yes. That's the idea. Martin Landa already has tried to implement this  
> to some extent in the new wxPython GUI. But it involves a lot of  
> workarounds for inadequacies in the GRASS vector querying. These  
> updates to querying modules would make this easier and more robust.
> 
> Michael 

Nice,

Thank you all for that huge amount of work !

Vincent.

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Re: [GRASS-user] interactive multiple selection

[Moritz Lennert]

On 22/01/09 07:14, Michael Barton wrote:



On Jan 21, 2009, at 11:05 PM,  wrote:


Date: Wed, 21 Jan 2009 18:45:40 +0100
From: Vincent Bain 
Subject: Re: [GRASS-user] interactive multiple selection
To: GRASS user list 
Message-ID: <1232559940.6769.10.ca...@vincent-desktop>
Content-Type: text/plain


Very much related to this, please see my suggestions for updates to
the GRASS query functions. Most should be relatively minor changes,
but would make querying much easier. And it would make it easier to
implement GUI wrappers for interactive querying.

<http://grass.osgeo.org/wiki/GRASS_6.3_Feature_Plan> "Updates to
vector querying "


OK, good perspective !

Concerning the GUI wrapping of commands such as v.what or v.select,
will it imply the ability to query directly within the display window ?


Yes. That's the idea. Martin Landa already has tried to implement this 
to some extent in the new wxPython GUI. But it involves a lot of 
workarounds for inadequacies in the GRASS vector querying. These updates 
to querying modules would make this easier and more robust.


One of the first things that probably needs to be done is to implement 
the spatial index in a file, instead of memory, as already suggested by 
Radim:


http://freegis.org/cgi-bin/viewcvs.cgi/grass6/doc/vector/TODO?rev=HEAD&content-type=text/vnd.viewcvs-markup
("Keep topology and spatial index in file instead of in memory")

Otherwise any vector querying becomes very slow with larger maps.

Moritz
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