[GRASS-user] snap point to line/break line at given points

[Moritz Lennert]

On 18/04/11 12:55, Micha Silver wrote:
> On 04/18/2011 12:55 PM, Moritz Lennert wrote:

>> v.distance should be able to do the labelling for you.
>>
>
> I tried this part, but couldn't get it to work :-( . I used v.what.vect
> (and v.distance directly) to get the cat values from the new points into
> the river vector line segments, but each time it gave me:
>
> ~ > v.distance from=river to=new_pts upload=cat col=pt_cat to_col=cat
> 100%
> 100%
> 1 categories exist in the table
> 0 records updated
> v.distance complete.
>
> But the new_pts vector has 6 cats:
> ~ > v.category new_pts opt=print
> 1
> 2
> 3
> 4
> 5
> 6
>
> and the river vector has 7 segments:

Yes, but how many cat values. probably all segments have the same cat 
value. You might have to use v.category to create separate cat values 
for each line.

Moritz