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Create routes from existing polylines

Creates routes by merging existing polylines that have the same common identifier.

Inputs:

• A Polyline feature layer
• Route Identifier field
• Method for route creation
• Output Spatial Reference

Output:

• A PolylineM feature class. The polylines are measured depending on the method selected - based on the length of the polylines, the values of a single field or two fields (From Measure and To Measure)

Measuring Methods 

• Using the lengths of the source polylines. 
  • The user controls the direction of the routes by specifying the coordinate priority of the starting measure (see notes)
  • If there are spatial gaps between the polylines to be joined, the user specifies whether these gaps to be taken into account when assigning the measures (see notes)
• Using the values in a single numeric field
  • The user controls the direction of the routes by specifying the coordinate priority of the starting measure (see notes)
  • If there are spatial gaps between the polylines to be joined, the user specifies whether these gaps to be taken into account when assigning the measures (see notes)
• Using known measures in two numeric fields. From Measure and To Measure. 
  • Very important factor in this case is the orientation of the original polylines. The polylines must be oriented in the direction of increasing measure
  • Since known measures are used for each polyline, the Spatial Gaps parameter is not used when using this method 

Notes:

• Coordinate Priority (not used if the third method above is used). This parameter defines the direction of the output routes and the order in which the original polylines will participate in the route. The available options are
  • Lower Left ("ll")
  • Lower Right ("lr")
  • Upper Right ("ur"
  • Upper Left ("ul")

  The options are determined by the minimum bounding rectangle for each route. If the "Lower Left" option is used the routes will start from South-West All original polylines will be oriented to go in North-East direction and the measures will increase in this direction.

  	Original Polylines
  	Route Coordinate Priority = "Lower Left"
  	Route Coordinate Priority = "Lower Right"

• Spatial Gaps: In many cases a route consists of disjoined parts A road for example that have the same name on both sides of a river might be represented by a single route. For such cases the user has to specify how the spatial gaps between the disjoined parts of the route will be handled when calculating the measures. 

	Original Polylines
	Ignore Spatial Gaps option selected - Continuous measurements
	Ignore Spatial Gaps option not selected - The gap distance incorporated into the measures. The straight-line distance between the disjoined nodes added to the measures

• The user can specify output spatial reference that is different from the projection of the input dataset. The Output Spatial Reference must have the same geographic coordinate system as the input dataset