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Strange lines radiate to the upper left corner, and to the bottom of the ArcMap draw window, when data is symbolized with a double line symbol.
The display problem is caused by intersection errors in the data.
Solution or Workaround
- For ArcInfo coverages, change the FUZZY tolerance to a lower value. For example,
Arc: tolerance <coverage_name> fuzzy .001
Import the coverage line features to a file geodatabase.
- For CAD data, import the polyline feature class from the CAD file to a file geodatabase.