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Get/Extract/Determine the DIRECTION of a line

Question asked by geonetadmin on Sep 28, 2011
Latest reply on Oct 19, 2011 by geonetadmin
Original User: DeSchlong

We all know that simple polylines, when digitized, are given a DIRECTION.  This is why the function "Flip Lines" exists in ArcToolbox.  However, I would like to select all the lines of a certain direction (left to right, or Clockwise/Counter-Clockwise, for example, or however they are described), and FLIP only these lines.  How do I do this?

The purpose of this is to add line decorations which need to point a certain way - in this case I have depression contours symbolized with tick marks that need to point inward but the direction of the tick marks is dependent on the direction the line was digitized originally.