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Hoe vind ik drie-weg kruispunten?

PaulFrissora1

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Ik heb twee lagen: Laag A heeft Junctions als een Point-bestand; Laag B heeft edges als een Line-bestand. <\/STRONG><\/P> <\/P>Het probleem: <\/STRONG>Ik zoek naar junctions die worden gekruist door precies drie lijnen (niet meer, niet minder). Zoals dit: <\/P> <\/P> \<\/P> &nbs p;&nbs p;<\/P>&nbs p;&nbs p;x-------------&nbs p;&nbs p;&nbs p;&nbs p;&nbs p;&nbs p;&nbs p;&nbs p;&nbs p;&nbs p;&nbs p;&nbs p;&nbs p;&nbs p;&nbs p;<\/P>&nbs p;&nbs p;&nbs p;&nbs p;&nbs p;&nbs p;/<\/P>&nbs p;/<\/P>&nbs p;<\/P>Ik zoek een manier om deze junctions te vinden, hetzij door selectie of door een apart shapefile te maken. Het lijkt erop dat dit kan via het aanmaken van een Geometric Network of Network Analyst dataset, maar ik heb niet veel informatie kunnen vinden in de forums en documentatie online.&nbs p;<\/P>&nbs p;<\/P>Heeft iemand dit eerder gedaan?&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;

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MikeMillerGIS

If you create a geometric network, you can take advantage of the Select Junction by Edge count tool in the water utility add in.

Water Utility Network Reporting toolbar - Water Utility Network Editing and Analysis | ArcGIS Solutions for Water

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PaulFrissora1

Thank you! This worked perfectly

RobertBorchert

Are your lines broken at the intersections?

Create points from the end points of your lines. populate them with X,Y

bring them into MS Access and run a query to look for duplicates.

If the lines are not broken at intersections then generate points of vertices.

It sounds like your not already in a geometric network, so you will probably have lines that are really close to each other but not actually touching. So then use the points and the Generate Near Table analysis to find lines and the distance to them. If it is only a few inches to feet then it is an area to look at first.

This all makes a strong case for a geometric network, it gives you assurance that everything is connected and more accurate.

MikeMillerGIS

If you create a geometric network, you can take advantage of the Select Junction by Edge count tool in the water utility add in.

Water Utility Network Reporting toolbar - Water Utility Network Editing and Analysis | ArcGIS Solutions for Water

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