[GRASSLIST:858] Re: v.segment

[Dylan Beaudette]

Trevor,

not sure if this would do what you want, but I made a module called 
d.bearing for the creation of transects, with some notes on dividing up 
the main line segment into points along that line:

http://casoilresource.lawr.ucdavis.edu/drupal/node/149

cheers,

Dylan

On Apr 24, 2006, at 11:26 PM, Trevor Wiens wrote:

> On Mon, 24 Apr 2006 23:00:15 -0700
> Michael Barton <michael.barton at asu.edu> wrote:
>
>> Use v.category to attach categories.
>>
>> V.to.db to add information to attribute table? I don't know if this 
>> works
>> with v.segment output or not. In fact, I can't figure out how 
>> v.segment
>> works either.
>>
>> Create a dbf file using a spreadsheet (OO or Excel -- OO works 
>> better). Call
>> the first column "cat", make it an integer, and fill it with a 
>> sequence of
>> numbers equal to the number of points you have. Then use v.db.connect 
>> to
>> link them up.
>>
>
> Michael,
>
> Thanks, but not really what I wanted to hear.
>
> I wrote a script to make stops on Breeding Bird Survey route lines at
> equal intervals, and manipulated the category values to be meaningful.
>
> Unfortunately, v.segment doesn't create an attribute table so I used
> v.build with the cdump option to get a list of the categories and then
> used db.execute to add them one by one into a table. Very slow.
>
> I can see now I could get a list easier using v.category, but
> unfortunately it won't automagically create an attribute table with the
> categories in it.
>
> I was hoping for an easy way to do this as it would make the script a
> lot more elegant and faster, but it appears that my ugly hack is the
> only solution.
>
> Thanks
>
> T
> -- 
> Trevor Wiens
> twiens at interbaun.com
>
> The significant problems that we face cannot be solved at the same
> level of thinking we were at when we created them.
> (Albert Einstein)
>
>
--
Dylan Beaudette
Soils and Biogeochemistry Graduate Group
University of California at Davis
530.754.7341