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I have a forked river with multiple x,y data points along it and I need to measure the distance between these points when travelling along the river. However the forked part is throwing a wrench into things. I need the total distance as you move from 1-2, 2-3, 3-4 etc. The problem is the points are not sequential along the river and some points are in one fork while the next points are in the other. This is in ArcMap10. Thanks

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I think you'll need to post more information about the data and any related data you may have such as a corresponding line feature class. You should also more clearly state exactly what distance you are trying to measure, and whether there is an attribute or combination of attributes that can be used to identify the features making up that distance. Also screenshots of the geography and the attributes would help, but you may not yet have enough reputation to add images (links might work though). – blah238 Nov 15 '11 at 0:51
I assume you have a multilinestring? You could create a graph based on all your data points and use shortest_path algorithms on that mini graph. Or you could cut the river in two at the fork and work with that. Then your points should be sequential again. – mrg Nov 15 '11 at 9:19

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