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

[Johannes Radinger]

Am 16.04.2011 um 17:25 schrieb Daniel Victoria:

> Not sure how to split and label the rivers but to snap the point to
> the closest river you could use v.distance

I also thought about v.distance. There I get the coordinates of the
closest points on the new line (stdout). I just have to create a new
pointfile from the standard output coordinates...or is there any
simpler way?

And I also still don't know how to split the lines at these points.
I thought about v.split but here are segemnts created at equidistant
breakpoints and one can only set the distance in metres but
it is not possible to use coordinates as input...anyone knows how
to do that?

cheers
/johannes

>
> Cheers
> daniel
>
> http://grass.fbk.eu/grass65/manuals/html65_user/v.distance.html
>
> On Thu, Apr 14, 2011 at 6:36 AM, Johannes Radinger  
> <JRadinger at gmx.at> wrote:
>> Hello,
>>
>> I have a line-vector (river) and some points on that line. First I  
>> am straightening that line with v.generalize (method: boyle). Now,  
>> there is the problem that the points are not exactly on the line  
>> anymore. So I want to snap (move) the points to the new  
>> generalized line again. Which tool is able to do that?
>>
>> After that I want to split the line at these points and want to  
>> give the attribute value to the newly created segments. These  
>> segment values should represent the number/value of the upstream  
>> point (which was used to split). How can this be done in GRASS?
>>
>> Do you have any ideas to solve these two problems/challenges?
>>
>> thank you
>>
>> /johannes
>> --
>> GMX DSL Doppel-Flat ab 19,99 Euro/mtl.! Jetzt mit
>> gratis Handy-Flat! http://portal.gmx.net/de/go/dsl
>> _______________________________________________
>> grass-user mailing list
>> grass-user at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/grass-user
>>