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You are looking for what is called the "strongly connected components" in graph theory jargon. These network islands can be computed in QGIS with the grass plugin - See v.net.components.


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Per the comments, and as Erica originally suggested, your network isn't correctly set up for analysis as evidenced by a severe lack of junctions. This could result from either geometry issues with the data or how the connectivity policy is defined. I suspect both might be an issue in your case, as most junctions I see are at line endpoints, but there are ...


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I think you should check the "remove bad geometries" checkbox. There might be geometry issues with some of your routes or points dataset.


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there is a flipline tool, though it doesn't seem to allow queries on a feature. it may be that you can provide the tool with a feature layer based on the selected attributes. EDIT: As @JasonT mentioned, the flip tool should honor selections, so perhaps use make feature layer with a SQL clause on the features that should be flipped and pass that layer to ...


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Take a look at OD Cost Matrix within Network Analyst, sounds like it should work for what you describe you need.


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I have a similar problem but because my process is iterative, I can have it easier by reusing the path and updating the feature every iteration. I also coded the program to be a standalone python rather than trying to run it inside arcGIS. I've basically coded everything into its own function, so for example, the part where I solve and export the OD table ...


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I don't think you can name your feature classes as those {DC034A5A-77FD-4B9E-BD36-ECDE5ABD576B} for defining variable names in Python code. You should perhaps replace them with a string ("temp_layername"). I would recommend opening manually a GP tool in Network Analyst toolbox > define the parameters > run it > make sure it worked fine > go to Results window ...


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Clip won't work on the Network Dataset itself, but it should work on all the component feature classes that go into the dataset. Rather than clipping to a shapefile (which basically gives you all new features to start building a whole new network from the ground up), just clip/modify the existing feature classes in the gdb (making a copy first of course). As ...


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Ok,so I think I found an answer to my problem. Basically, hierarchy is used in long-distance networks where a lot of routes must be solved. Say if you are traveling from Vancouver to Seattle, hierarchy will help you solve the route faster. Instead of solving for all small routes, the solver will solve based on hierarchy and excludes smaller roads until it ...


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Ok, I tried everything again. I am working in a database so I created separate feature classes and removed all costs but length ( you need to at least have one to run the network ) yet ,it is not working. So I even made the network much simpler, I can't humanly make it simpler than this. Attached are the pictures: Note: the red line hierarchy :1 The green ...


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Have you followed the guidelines on these pages? http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//004700000057000000 http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//004700000020000000 "Using hierarchy by default As long as the network dataset has a hierarchy attribute, you can set any network analysis layer you create to use ...


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Network analyst will solve the graph that is provided to it. So you can either use a projection that is not "cut" at the opposite of a prime meridian, or create virtual East-West links with a zero length to make sure that the connections exist when you cross the day line.


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There have been some earlier Q&As here and postings on Esri's Mapping Center blog: How to represent overlapping lines in ArcGIS for Desktop? Cartographic techniques for symbolizing routing data display overlapping bus lines Show overlapping lines but they seem mostly to point back to an Esri Mapping Center blog entitled Create route maps with the ...


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There's basically no simple solution to this issue. Because the route traverses the same edge more than once, you're going to have overlap. You could add directional arrows to the lines, but then you'll still have overlap just with arrows pointing both directions. You could do the route as separate legs to each stop and color them differently, but you'll ...



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