Content Comparison

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• Close the attribute table, remove the join, and establish a new join basing on RIGHT_FID.  Anticipate all records matching.
• This time there should be no need to make a definition query, as there should be no null values.
• Open the output polyline shapefile attribute table.
• Use the Field Calculator to calculate all the RIGHT_Ax values (for the RIGHT_Ax fileds recently added to the polyline shapefile ) equal to the coresponding administrative levels of the polygon shapefile.
• Create a definition query to select the line segments with different LEFT_A0 and RIGHT_A0 attributes.

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  Administrative levels in boundary polygon shapefile	Required calculations
  Administrative level 0
  Administrative levels 0 and 1	polyline shapefile RIGHT_A0 = polygon shapefile Adm0codepolyline shapefile RIGHT_A1 = polygon shapefile Adm1code
  Administrative levels 0, 1, and 2	polyline shapefile RIGHT_A0 = polygon shapefile Adm0code polyline shapefile RIGHT_A1 = polygon shapefile Adm1code polyline shapefile RIGHT_A2 = polygon shapefile Adm2code
  Administrative levels 0, 1, 2, and 3	polyline shapefile RIGHT_A0 = polygon shapefile Adm0code polyline shapefile RIGHT_A1 = polygon shapefile Adm1code polyline shapefile RIGHT_A2 = polygon shapefile Adm2codepolyline shapefile RIGHT_A3 = polygon shapefile Adm3code

  
  

[IF THIS DOES NOT WORK, ENTER ' "LEFT_A0" IS NULL']

• Open attribute table and calculate AdminLevel = 0
• Open (Unless the Adm0 lines are all shoreline or all international boundary ... IN WHICH CASE....) open an editing session for the line shapefile.
• Manually select line segments that represent shorelines (splitting line segments where an international border meets the water).  It may be useful to add a world country layer or neighboring country layers.

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