pgRouting

Forum #23 - Topic #43 - Message List

Difficulty with creating road network

Hey all,

I'm having issues with creating a road network with my new dataset.

My old dataset had some spots in the data where the roads were not perfect, we eventually narrowed it down to a .0004 tolerance worked for the dataset.

Now I am on a better dataset, where the roads are spot on (zoomed in with QGIS to 1e-10 decimal degrees and the data looks exact), however my old snapping tollerance of .0004 is not working anymore. Nor is anything smaller. When I run the assign_vertex_id with the .0004 and create the graph tables and try and route across even a single intersection I get no routes returned.

My current data is made up of MULTILINESTRINGs each containing a number of LINESTRINGs. My last dataset contained the same wrapper opbject (MULTILINESTRING) but each contained only a single LINESTRING. Not sure that is why it would madder (and I hope it doesn't as converting all these many part MULTILINESTRINGS to single part MULTILINESTRINGS would be a pain).

But aside from that and the accuracy of my data there are no differences between my two data sets.

Anyone have any idea why my road network is no longer being created?

- Brian Peck

peckb1
09/05/07 03:07:52
Tree View Flat View (newer first) Flat View (older first)
  • Message #157

    Hi Brian,

    It is hard to tell what's the reason without seeing your dataset. Can you post here or send me by email small pieces of both datasets?

    anton
    09/12/07 13:56:02
    • Message #158

      I can, though when I try and reply there is no option for an attachment, can you e-mail me your e-mail so I can send it that way?

      - Brian Peck

      --email removed--

      peckb1
      09/12/07 23:45:37
Tree View Flat View (newer first) Flat View (older first)