Network Analyst: strange build errors with 3d lines "below surface"

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03-10-2017 06:01 AM
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Occasional Contributor III

Hi,

I am trying to build my network on my newtork dataset, but I am having issues which I cannot understand.

I have already read this help page from ESRI (Common build errors), but none of the points listed there seems to fit my situation.

Basically, I am creating a network on 3d data (two polyline fefature classes, floorlines and floor transitions). The floorline FC contains lines with the same Z, which represent a specific floor. Each floor has its own lines with a Z associated (there are 5 floors in total). To give a precise idea, below is an image of my dataset (together with the floortransitions, in grey).

I checked that all geometries are ok running the "Check Geometry" tool. Moreover, to avoid any possible problem related to the proximity of the lines in the "XY" plane, I moved each floor so that the lines do not overlay in the XY coordinates for different floors (maybe this wasn't needed, but from I can see each floor at the same time from both ArcMap and Pro in 2d).

Another picture is given in order to give an idea on this as well (zoom is shown, scale is 1:50).

So, here comes my issue...

Whenever I try to build the network, I receive a warning saying that some errors have occurred. If I see which feature was creating this issue, all refer to the very first floor (see build errors lnes highlighted in purple). My idea is that, as the first floor is below the surface (according to the WorldElevation3D/Terrain3D surface provided by ESRI), the tool cannot create the network properly.

Moreover, I don't if it can be a matter of vertical coordinate system (I am using the WGS 1984 Geoid, WKID 105700).

I will try to move the very first floor (green lines) so it will be above the surface and will come back to this. Meanwhile, if anybody has had a similar problem or has some suggestions, I would be happy to hear it! Thanks in advance.

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Occasional Contributor III

I finally managed to make it working. I discovered there were some lines in the first floor that did not intersect. Strangely, this was only visible at a super smal scale (actually, at 1:0 !!!). After I fixed those issues, the routing was succesfull. Hope this could be of help.

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Occasional Contributor III

Moving up the surface my dataset did not solve the issue. I am still getting the same build errors.

So, I decided to remove and re-add those features which apparently were causing the problem. Then I rebuilt the network. This time no warnings. "Great!" I thought, but then the routing still does not work for the same first floor. Strangely, the generated junctions are "outside" of the actual floorline position (have a look at the red crosses in the picture below). It is becoming frustrating, I cannot get the network analyst to build my network. If anybody is intereseted in this situation, I would be happy to share the zipped gdb via email. Thanks in advance for any help!

Solve working from last to lower floor (not the very first one)

Solve not working from last to very first floor

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Occasional Contributor III

I finally managed to make it working. I discovered there were some lines in the first floor that did not intersect. Strangely, this was only visible at a super smal scale (actually, at 1:0 !!!). After I fixed those issues, the routing was succesfull. Hope this could be of help.

View solution in original post

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