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When using the default symbology for 3D lines, the lines display according to the Z-values that denote elevation or depth. Lines with positive Z-values lie above the surface whereas lines with negative Z-values lie below the ground and are invisible on the map.
In some cases, 3D lines with both positive and negative values display above the surface in small scale. Lines with negative Z-values disappear, showing the actual elevation of the surface, only when the map is zoomed into large scale.
This problem may occur due to one of the following reasons:
Depending on the cause(s), select one of the options below to resolve the problem.
Note the difference between the Tube (A) and Strip (B) symbology as shown in the image below. The section of the lines with negative Z-values are no longer visible on the map surface when using the Strip symbology.