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Distance of junction points from a single point feature along a polyline.
+6- Participant
I have a multi-part polyline with junction points along the line. I'd like to measure the distance of each junction points along the line from a single source point feature. All parts flow away from the source already. I am also trying to determine the length of each part from the starting point to the end point of each segment that branches off from the junction points...
.. Best answer by geospatiallover
I followed exactly what you said and took a good bit of time to undersand how the FromTo and Shortest PathFinder works. Thank you very much and I appreciate the help.
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+6- Participant
Error on the drawing... the blue colored junction points were meant to be the end points of every junction and not a junction point.
Hi,
In the case of such tree structure graph, I would try using the ShortestPathFinder.
(1) Send the polyline to an Intersector or a TopologyBuilder to transform it into network lines.
(2) Create from-to lines for each junction point so that each line connects between a junction point and the source point.
(3) Add a ShortestPathFinder; send the network lines to the Neetwork port; send the from-to lines to the From-To port.
(4) Calculate the lengths of the resulting shortest paths. The length is the distance measured along the path between a junction and the source.
Takashi
+6- Participant
Deleted the previous comment and replaced with this. 
Thanks for the quick response and I really appreciate your help. I got it to work somewhat but there must be something wrong with my network. Noticed two problems: the From To Builder builds paths "as the crow flies" from the source to each junction. Secondly, my results does not get into the Path output port of the ShortestPathFinder. I would think that the two are related. Please comment on my workspace when you have a chance. Below is a picture of my workspace:
There could be a problem on parameter setting of the FromToBuilder. Try using this process, instead of the transformer. This process is basically the same as the transformer definition.
(1) Extract coordinate (_x, _y) of the source point with a CoordinateExtractor.
(2) Add a FeatureMerger to merge the coordinate (_x, _y) to every junction point unconditionally.
Junction points --> Requestor
Source point --> Supplier
Join On: <set the same value (e.g. 1) to both requestor and supplier so that the unconditional merging will be performed>
(3) Connect a VertexCreator to the Merged port of the FeatureMerger to add the source point to each node point.
Mode: Add Point
X Value: _x
Y Value: _y
+6- Participant
- Best Answer
I followed exactly what you said and took a good bit of time to undersand how the FromTo and Shortest PathFinder works. Thank you very much and I appreciate the help.