Hi, Maybe this thread about closing contour polylines can give some hints: http://postgis.refractions.net/pipermail/postgis-users/2012-May/034149.html
Do you have sample data we could play with ? Nicolas On 5 September 2012 19:15, Max Pyziur <p...@brama.com> wrote: > > Greetings, > > I'm trying to figure out a way of constructing linestrings between > endpoints. > > Shapefile data for pipelines and railroads does not present continuous > lines; instead they are in the form of small line segments. The applications > are using data for roads, pipelines, or railroads. > > Interstate 70 is not one complete linestring between Washington DC and the > middle of Utah; instead it is a series of segments. The same with pipeline > and railroad data. > > The problem becomes more cumbersome (at least to me) when there is no > knowledge of the data between two points (say Edmonton and Vancouver) and > you want to see if there is a way to string a set of segments between two > points (to answer a question like is there a railline between Edmonton and > Vancouver)? > > I would appreciate any advice on how to proceed. > > Much thanks, > > Max Pyziur > p...@brama.com > _______________________________________________ > postgis-users mailing list > postgis-users@postgis.refractions.net > http://postgis.refractions.net/mailman/listinfo/postgis-users _______________________________________________ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
