[GRASSLIST:856] Re: v.segment

[Trevor Wiens]

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)