[GRASSLIST:3994] Re: how to access built-in vector attributes (GRASS 5.7)?

[William K]

egads!  that's a lot of work.

Actually, I was trying something similar, from bits here and there off 
the mailing list.  I had trouble creating the DB at first.  Then it 
looks like I missed the cat thing - I wasn't reclassing the cats to 
unique numbers, and I wasn't populating the db with the cats first.  
(Oh, why can't there be a simple one-for-one relationship between 
features and attributes, instead of messing around with this category 
stuff?)


On Jul 22, 2004, at 7:06 AM, Markus Neteler wrote:

> On Wed, Jul 21, 2004 at 03:59:41PM -0500, William K wrote:
>> Or whatever they're called.  Right now I'm looking at lines.  When you
>> d.what.vect, it shows cats, fields and attributes, and length and line
>> height.  I haven't checked polgons yet, but I'm guessing they have
>> perimeter and area instead of length.
>>
>> 1. I would like to v.extract to extract lines above a certain length -
>> ie weed out those short blips.
>
> You need to use v.to.db.
>
> .....
>

-----
William Kyngesburye <kyngchaos at charter.net>
http://webpages.charter.net/kyngchaos/

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First Pogril: I don't know either.  Wretched, isn't it?

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