Hi @ring_a I've never tried 1M From-To lines but it should work in theory. If the error message is accurate it sounds like a problem with a particular From-To line. Try sending a different group of 100 or 1000 From-To lines to see if you can narrow down the problem. If you get this error message every time then please report your problem here.

Hi @ring_a,

I might have run into this before when my input lines actually formed multiple valid networks. Have you run your From-To lines through a NetworkTopologyCalculator? I wonder if you get more than one feature out of this transformer.

Hope this helps,

Nathan

Thanks Nathan,

I do have multiple networks within my network. is there a way to extract the single largest network?

Rings

Thanks Dan,

After splitting my lines into groups, I seem to get this problem occasionally. I can't see anything wrong with the From-To lines as there are all valid lines generated from vertex creaters and using the same coordinate system as the network. I feel like the problem comes from the network.

Rings

How complicated are your from_to lines? I've seen the error before but i can't recall the circumstance. Normally if it's an issue with the from-to line you'd just get data output via the NoRoute port with a more specific error message "The source node at (0, 5) in the shortest path calculation is not a valid node in the network" so i agree it sounds like something else

Hi @ring_a,

I suppose one way would be to calculate the length of all the lines coming out of the NetworkTopologyCalculator, then aggregate by the network_id and sum. Sort and sample the largest number. Or if your lines are already all the same length, just count the number of lines in each network_id group and take the largest number.

hi Nathan,

I managed to extract the largest network by fanning out through network id. But unfortunately, having rerun the shortestpathfinder with this new network, i still get the same errors.

Any other thoughts?

cheers,

rings

Dan,

many thanks,

Are you sure that every start/end node of the From-To lines exactly matches a node belonging to the largest network you have extracted?

Hello @ring_a

Check that your network vertices are split at intersections, if not run a TopologyBuilder before the ShortestPathFinder (not 100% sure this matters).

Cheers

Can you put a Chopper transformer into the Network stream of data and set Maximum Vertices to 2? A trap I just fell for is that your from-to lines must meet the END node of a line. They won't snap to a vertex in the middle of a line. The Chopper would resolve that.