v.category problem - was Re: [GRASS-dev] Keywords, help pages...

[Markus Neteler]

Trevor Wiens wrote on 08/28/2006 03:20 PM:
> Posting an answer to the user list....
>
> On Mon, 28 Aug 2006 22:14:56 +1200
> Hamish <hamish_nospam at yahoo.com> wrote:
>
>   
>> In GRASS-land boundaries + centroids make polygons, so convert lines to
>> boundaries with v.type and add centroids with "v.category option=add".
>>     
>
> Here is a classic case of something being difficult to find where
> properly defined keywords might help. I'd wondered about how to add
> centroids to areas before, but never bothered to figure it out when
> nothing obvious showed up scanning the command listing and descriptions.
>
> Even trickier, with v.category the option=add with the type=centroid
> doesn't add centroids, the type must be set to areas. I can't imagine
> how the naming could be more counter-intuitive.

This sounds like a bug to me.

Markus

>  Even the help page
> example isn't all that clear on this IMHO. 
>
> Would it be a good idea to add something explicit about this on
> v.category page as well as the grass vector intro page??
>
> T
>