Edges are the lines on your graph; nodes are the points where they meet up. The
osm data is organised by data type (point, line, poly) - so you need to spend
some time getting your data read - select out just the roads from
planet_osm_line that you want to form your graph with. When you pass these
lines into the GraphBuilder it will build a graph with edges and nodes; it is
this structure that you find the shortest line in.
I a not sure you mentioned you were using OSM before? The tricky thing with all
graph route finding stuff is data quality.
You may also wish to look at:
http://geotoolsnews.blogspot.com/2010/05/open-trip-planner.html They have there
own graph code internally; but they use geotools to load the data out of
postgis if needed.
Jody
On 08/06/2010, at 10:38 PM, laura siewe wrote:
> Hello everybody,
>
> In my PostGIS database, I have 6 tables: planet_osm_line, planet_osm_point,
> planet_osm_polygon, planet_osm_roads, spatial_ref_sys, geometry_columns. I
> don't have Nodes and Edges.
>
> In the file.xml, I have node with latitude and longitude, I have also way but
> not Edge.
>
> This all the information I have. What do you mean by Nodes and Edges in this
> informations. How can I do to have this in my PostGIS database?
>
> Thanks for your help.
>
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