On 18/04/11 08:19, Johannes Radinger wrote:
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?
v.edit tool=break coords=CoordinatesOfYourPoints
v.net option=connect + some cleaning afterwards might be another
possible solution. For each point, it will create a line connecting it
to the river, breaking the river at the intersection.
v.distance should be able to do the labelling for you.
Moritz
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 <[email protected]>
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
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