Hello,
I have a network of lines where I wanna detect and aggregate touching lines just as in the case shown below (lines that touches each other at the end or start node)
can someone help me with this, please ?
thank you
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9 May 2018
Hi @lianaolianov, the NetworkTopologyCalculator might help you. This transformer adds the same ID (Network ID Attribute) to all input lines belonging to the same connected network. You can then aggregate output lines using the Network ID as Group By attribute.
Hi @lianaolianov, the NetworkTopologyCalculator might help you. This transformer adds the same ID (Network ID Attribute) to all input lines belonging to the same connected network. You can then aggregate output lines using the Network ID as Group By attribute.
I have tried but it seems that there is somthing not working
The NetworkTopologyCalculator gives different IDs to connected lines in my case
Userlevel 3
+17
- Contributor
- 7538 replies
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9 May 2018
Hi @lianaolianov, the NetworkTopologyCalculator might help you. This transformer adds the same ID (Network ID Attribute) to all input lines belonging to the same connected network. You can then aggregate output lines using the Network ID as Group By attribute.
Do the lines exactly touch each other at their start/end nodes?
Here is another case
Userlevel 3
+17
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- 7538 replies
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9 May 2018
Do the lines exactly touch each other at their start/end nodes?
Userlevel 3
+17
- Contributor
- 7538 replies
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9 May 2018
Do the lines exactly touch each other at their start/end nodes?
Not sure. The transformer requires exact match on end nodes to determine that the lines form a connected network. If you check the coordinate values with Feature Information window in FME Data Inspector, do the values exactly match in full precision?
I think this was also the reason why, after using a LineCombiner transformer before, not all lines have been joined although they apparently seem perfectly connected.
How to deal with this issue please ?
To quick check, try sending the lines to the TopologyBuilder (set Yes to the Assume Clean Data parameter). If the lines belong to a connected network, point features would be output from the Node port for every start/end node of input lines.
Hower the NetworkTopologyCalculator still gives the same problem, is that normal ?
Thank you very much for the help, really appreciated.
Userlevel 3
+17
- Contributor
- 7538 replies
-
9 May 2018
To quick check, try sending the lines to the TopologyBuilder (set Yes to the Assume Clean Data parameter). If the lines belong to a connected network, point features would be output from the Node port for every start/end node of input lines.
After applying the snapper and the LineCombiner, NetworkTopologyCalculator is supposed to give the same ID to every set of connected lines, however, there was connected lines with different ID
+22
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9 May 2018
After applying the snapper and the LineCombiner, NetworkTopologyCalculator is supposed to give the same ID to every set of connected lines, however, there was connected lines with different ID
Are the lines that have a different ID in the NetworkTopologyCalculator properly noded? A line could touch another one, but if there isn't a node (not just a vertex) on both lines then they won't be connected in the same network.
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