Snapping problem causes wrong network dataset creation

EleniBoboti

Dear colleagues,

I am facing a problem that I cannot solve and would like to ask you for any ideas.

I want to create a network dataset from digitized road features. I digitized the features myself from a scanned map making use of the snapping option in the Editor.
However the nodes of my edges do not snap properly to the other edges. They appear to be snapping correctly at first but when I zoom in, there is still a gap (see attached picture: [ATTACH]7553[/ATTACH]). Thus in the network dataset edges do not get properly connected either.

Now I've tried a way to get around that which was not successful:
It seems the snapping is connected to the XY Tolerance which one can set, when creating a feature data set. By default the tolerance is set to 0.001 meters. So below 1 mm distance coordinates are considered to be equal. Hence the snapping goes somewhat wrong. There is always 1 mm distance between the node and the edge like in the picture.

So I changed the XY Tolerance to 0 in the feature data set. Then I used the Integrate tool on the road features with a tolerance of 0.002. Now all the nodes which were 1mm appart from the edges now appear to have snapped to the edges. However much I zoom in now, I cannot see a gap any more. Nevertheless the network dataset generation still does go wrong. There still seems to be a tiny little gap between the nodes and the edges.

My question is now. Is there a way to set an XY Tolerance for the network dataset generation or is there a way to snap the nodes correctly to the edges?

Any suggestion is appreciated!

Thank you so much.
Eleni

snapping_problem.png

JoeBorgione

Dear Alan,

Thank you for your explanation, it definitely helped me understand the situation a bit more. However, I still do not understand why I have to use the Integrate tool to my features before generating my network dataset. Even if I set a higher tolerace (like 0.002) to my original dataset and then generate the network dataset, there are no connections. Even if the nodes are only 0.001 m away from the edges. Shouldn't it work without using the integrate tool?

Kind regards,

Eleni

Eleni; the integrate tool actually moves feature elements (vetexes in you case) to become absolutely coincident with others found within the snapping tolerence.  Is it possible for you to post a portion of your data with known inconsistencies here on the forum?  I would be happy to execute the integrate tool upon those features to see if I can recreate the issue you are having.