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I am trying to add labels to my linear feature class. Some of my lines are vertical (i.e. I only see a point representing the start or end node of the line, because they have the same XY coordinates but different Z coordinates).

Unfortunately, it seems ArcMap cannot understand where to place the label (e.g. along the line, before the start, etc.) because the line itself is null (i.e. has 0 (zero) shape length).

The same seems to happen in ArcGIS Pro as well (although in the 3D viewer this problem does not occur, see the image below).

Is there a way to solve this?

enter image description here

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    It looks like that line with a Length = 0 is considered topologically incorrect. That is why it was excluded from rendering its label. Same behaviour happened in QGIS. – ahmadhanb Oct 30 '18 at 11:49
  • Is there a way to overcome this issue? Many ilnes I have have to be vertical because they really represent vertical features. – umbe1987 Oct 30 '18 at 11:50
  • as a workaround, you could try to use the midpoint of each line as a source of label – radouxju Oct 30 '18 at 11:53
  • @radouxju interesting. How? I mean, I don't want to add a point layer to achieve my aim. If you mean there's a setting somewhere in the label manager or similar where I can do this could you please tell me where? – umbe1987 Oct 30 '18 at 11:55
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    @NULL.Dude Lines to points did not work also, I have tried to convert lines to points (vertices), and for lines with length, I have got the points, but for the line with length = 0, the point was not created. – ahmadhanb Oct 30 '18 at 12:44
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I saw your comment that:

[You] don't want to add a point layer to achieve [your] aim

but if all else fails, then using ArcPy cursors to read the X,Y location of those vertical lines and creating a point feature class to label on should work.

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I finally ended up applying a small (1m) shift to the firstPoint coordinate of my vertical lines to be able to see the labels, although this is not the best, I had to avoid ctrating a parallel point layer as I would have had to manage two datasets and the final users (actually accessing the dataset from a web client) would have seen two layers (one for the lines and one for the labelled points) and this is not what I wanted.

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