[GRASS-user] Load attributes of point theme into adjoining line
theme - possible?
Wolfgang.Qual at gmx.net
Tue Feb 6 07:12:54 EST 2007
in some cases of my dataset, there is sometimes more than one point related to one line-segment. In that case, only the information of the nearest point should be transferred to the corresponding line segment. Possible?
> Hamish napisał(a):
> > Wolfgang Qual wrote:
> >> Hi list,
> >> another question with a small picture: my dataset consists of two
> >> themes, a point theme, representing locations where the traffic
> >> density of an adjoining segment of a street was measuredd and the
> >> corresponing line theme - the street. Now, I would like to add the
> >> traffic information to the line theme (in the picture below, three
> >> measurement stations are drawn).
> >> x(45)
> >> ----------------�\
> >> \ x(100)
> >> \--------------------------
> >> /
> >> /
> >> -------------�
> >> x(55)
> >> Is it possible to perform such an operation within GRASS? Any ideas
> >> are welcome!
> > v.distance
> > ?
> > Hamish
> > _______________________________________________
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> well, question seems to be unclear...
> it depends on how many traffic points are on the one line segment If one
> to one the situation is very simple. Use v.distance with to_attr
> parameter (from line to point!), if there are more mesurment points it
> could be the problem. relation between points and line shall to be
> crated (v.distance from points to line with cat attrribute), and the
> rest of work in database. If there are more than one point to segment
> please let me know I will try to describe how to make it in detail.
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