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How to remove self-intersecting polylines in ArcGIS

  1. Feature to polygon to remove non-closed polylines and create closed polygons that you want to remove
  2. Feature to line to get the closed lines only
  3. Erase output 2 from the original!
  4. Create a new integer field “LineID” and copy OID to this field
  5. Multipart to Singlepart
  6. Unsplit
  7. Remove short lines