[GRASS-user] category number incrementing when digitising
mlennert at club.worldonline.be
Fri Nov 18 05:19:34 EST 2011
On 16/11/11 07:12, Shane Litherland wrote:
> Hi all,
> 6.4.2RC1 on ubuntu 10.04.3, using wxgui
> when digitising new vector, in 'digitisation settings' on 'attributes'
> tab, I can play around with settings to add record to table, auto or
> manual cat etc.
> Noted that when cat mode is 'next to use' clicking the checkbox on/off
> for 'add new record into table', the number keeps going up by one for
> each click. same happens for the listbox for category mode if i keep
> clicking on the 'next to use'
Assigning category numbers to a geometrical object is independent from
the fact whether you add a record to a table or not. Category numbers
are identifiers you can assign to objects. If you wish you can link a
specific layer to a table and then those objects whose category number
appears in a specified key column in that table have attribute
information in the table, others don't.
So, if you use 'next to use' mode, but check off 'add new record into
table', you assign a category value to the objects you will digitize,
but no corresponding entry is added to the category table. This can be
very useful when all you need is categories and not other attributes
(e.g. you use specific integer codes for land use classes and just
assign each polygon the relevant land use class code as category value
without creating an attribute table).
I'm not sure, but I have the feeling that the above explanation might
also respond to all your other issues.
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