Remi,
I didn't tell you before but I want to use the main river line as the
line for labeling river's name. So an approximation to the main river is
good enough for me.
For a major number of cases (rivers tend to be quite linear), I can use
the st_longestline to get an approximation for the
Thanks Remi,
I thought that but I have no starting/ending points. St_StartPoint and
St_EndPoint are not working with MultiLinestrings
I'll give it some more intense thought. :)
Cheers.
*Toni Hernández Vallès*
Servei de Sistemes d'Informació Geogràfica i Teledetecció
-
Universitat de Girona
only the main river. Smoothline???
Thanks Remi,
I thought that but I have no starting/ending points. St_StartPoint and
St_EndPoint are not working with MultiLinestrings
I'll give it some more intense thought. :)
Cheers.
*Toni Hernández Vallès*
Servei de Sistemes d'Informació Geogràfica i
@lists.osgeo.org
*Objet :* Re: [postgis-users] Get only the main river. Smoothline???
Thanks Remi,
I thought that but I have no starting/ending points. St_StartPoint
and St_EndPoint are not working with MultiLinestrings
I'll give it some more intense thought. :)
Cheers
Hi everyone,
I have a multilinestring with a river and all its afluents as you can
see in this image
http://sigserver4.udg.edu/apps/geometries.png
I got geometry A using St_StraithSkeleton.
Is there a way to go from geometry A to geometry B??
Maybe something similar to SmoothLine???
--
if you have start and end point of geom B,
you can get the river path with a shortest path method (one liner using
python, can be done in few hours using plpgsql).
The idea is that you cut your geom into segments(pairs of points)
, the length of the segment is the weight of this edge
, and you
