How can i check, if all my lines are ahve a connection to each other. I have a net of multilines and i want check that all lines have a connection to min. 1 neighborline. Case: Can the bus drive from point 'a' to the point 'b' without any interrupt way/lines.?
Try using the NetworkTopologyCalculator. You should only have a single value of "_network_id" on the output features. If you have more than one value, you have disconnected edges.
Be aware that a connection is defined by start/end-node only, meaning that two intersecting lines (like an X) doesn't necessarily mean that they are topologically connected.
You can use the TopologyBuilder to force connections at all intersections. Sometimes a Snapper can also be useful as a pre-processing tool if you have some tiny gaps in your line connections.
+28- Contributor
The NetworkTopologyCalculator will assign a unique ID to every set of connected lines. You can aggregate or use the statisticsCalculator on the _network_id to get a count per network.
Alternatively you can use the topologyBuilder to identify nodes that have only one connection (dangle nodes) and then identify the lines where both nodes are dangle to get isolated lines.
For the use case of driving a bus from point a to point b you can use the ShortestPathFinder, if a route is not possible it will come out of the NoPath port.
+47- Celebrity
I used a different approach: SpatialFilter set to "Filter TOUCHES Candidate" and then input the lines as both Filter and Candidate.
1 person upvoted this
redgeographics wrote:
I used a different approach: SpatialFilter set to "Filter TOUCHES Candidate" and then input the lines as both Filter and Candidate.
+47- Celebrity
david_r wrote:
Will that work for crossing lines that has no intersection node?
+28- Contributor
david_r wrote:
Will that work for crossing lines that has no intersection node?
+16- Supporter
Yet another approach would be to use the LIneJoiner, the join will take place only where segments are properly connecting.
itay wrote:
Yet another approach would be to use the LIneJoiner, the join will take place only where segments are properly connecting.
+28- Contributor
itay wrote:
Yet another approach would be to use the LIneJoiner, the join will take place only where segments are properly connecting.
+15- Contributor
@jdh "Could you explain how the Linejoiner would identify isolated segments?"
Generate a list on the LineJoiner. List with 1 element (object itself) will have not joined to anyone.
Use ListElementCounter
+28- Contributor
gio wrote:
@jdh "Could you explain how the Linejoiner would identify isolated segments?"
Generate a list on the LineJoiner. List with 1 element (object itself) will have not joined to anyone.
Use ListElementCounter
david_r wrote:
Try using the NetworkTopologyCalculator. You should only have a single value of "_network_id" on the output features. If you have more than one value, you have disconnected edges.
Be aware that a connection is defined by start/end-node only, meaning that two intersecting lines (like an X) doesn't necessarily mean that they are topologically connected.
You can use the TopologyBuilder to force connections at all intersections. Sometimes a Snapper can also be useful as a pre-processing tool if you have some tiny gaps in your line connections.
redgeographics wrote:
I used a different approach: SpatialFilter set to "Filter TOUCHES Candidate" and then input the lines as both Filter and Candidate.
ivopaffrath wrote:
The snapper works nice in 50% case. So i want flag the lines and correct it self. How i can i transform the multilines/polylines to singlelines?
There is also the Chopper, but I suspect that's not what you want?
ivopaffrath wrote:
They not show lines who cross another line without a same node. Its important that i also this lines. Idea to complete the script?
david_r wrote:
Try using the NetworkTopologyCalculator. You should only have a single value of "_network_id" on the output features. If you have more than one value, you have disconnected edges.
Be aware that a connection is defined by start/end-node only, meaning that two intersecting lines (like an X) doesn't necessarily mean that they are topologically connected.
You can use the TopologyBuilder to force connections at all intersections. Sometimes a Snapper can also be useful as a pre-processing tool if you have some tiny gaps in your line connections.
Control with ShortestPathFinder
Thx @all!
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