[GRASS-user] Category number of boundaries (Vector Digitizer in GRASS7.0.3 for Windows).

GRASS GRASS user
1

Dear GRASSusers,

in digitizing an area with the button ‘Digitize new area (boundary without category)’ no category number is (correctly) assigned to the boundary but only to the centroid.

In digitizing with ‘Digitize new boundary’ it seems that a category number is assigned anyway, even if in the attribute panel the Delete button is used. Is there a way to not assign a category number to a boundary?

Thanks

Aldo Clerici

2

Hi,

···

2016-04-26 13:03 GMT+02:00 Aldo CLERICI <aldo.clerici@unipr.it>:

In digitizing with ‘Digitize new boundary’ it seems that a category number is assigned anyway, even if in the attribute panel the Delete button is used. Is there a way to not assign a category number to a boundary?

go to Digitizer settings → Attibutes → Category mode → No category. We could probably add to General → Digitize area new option Assign category to boundaries (default: uncheck). What do you think? Martin

–

Martin Landa
http://geo.fsv.cvut.cz/gwiki/Landa
http://gismentors.cz/mentors/landa

3

On 26/04/16 13:03, Aldo CLERICI wrote:

Dear GRASSusers,

in digitizing an area with the button ‘Digitize new area (boundary
without category)’ no category number is (correctly) assigned to the
boundary but only to the centroid.

In digitizing with ‘Digitize new boundary’ it seems that a category
number is assigned anyway, even if in the attribute panel the Delete
button is used. Is there a way to not assign a category number to a
boundary?

You have to set category mode to 'no category' in the attribute tab.

If by 'Delete button', you mean the checkbox 'Delete record from table' this means that when you delete an object from the map, the entry in the table corresponding to that category is also erased.

Moritz

4

Dear Martin and Moritz,
thanks for your answers. Yes, the ‘No category’ option in ‘Digitization settings’ could be the solution. It’s really a bit hidden. Probably the options ‘Next not used’, ‘Manual entry’, ‘No category’ should be more handy if inserted in the ‘Define attribute’ panel (as in the old v.digit panel).
I have another question. Is there somewhere some kind of documentation about the ‘Digitization settings’? To know, for example, the way to defined the bounding box of the option ‘Select only feature inside of selection bounding box’ in ‘General’, or the use of the section ‘Geometry attributes’ (length, area, perimeter) in ‘Attributes’?
Many thanks again.

Aldo Clerici

-----Messaggio originale-----
Da: Moritz Lennert [mailto:mlennert@club.worldonline.be]
Inviato: martedì 26 aprile 2016 13:33
A: Aldo CLERICI <aldo.clerici@unipr.it>; grass-user@lists.osgeo.org
Oggetto: Re: [GRASS-user] Category number of boundaries (Vector Digitizer in GRASS7.0.3 for Windows).

On 26/04/16 13:03, Aldo CLERICI wrote:

Dear GRASSusers,

in digitizing an area with the button ‘Digitize new area (boundary
without category)’ no category number is (correctly) assigned to the
boundary but only to the centroid.

In digitizing with ‘Digitize new boundary’ it seems that a category
number is assigned anyway, even if in the attribute panel the Delete
button is used. Is there a way to not assign a category number to a
boundary?

You have to set category mode to 'no category' in the attribute tab.

If by 'Delete button', you mean the checkbox 'Delete record from table'
this means that when you delete an object from the map, the entry in the table corresponding to that category is also erased.

Moritz
Il 5xmille a favore dell’Università di Parma (indicando il codice fiscale 00308780345) è un gesto tanto semplice quanto importante per creare nuove opportunità di lavoro per giovani di talento nell'ambito della ricerca scientifica.