polygonToPolylineAdvanced

Converts the polygon boundaries to polylines.

Creates a topologically correct (nodes at intersections, no overlaps) Polyline feature class
For each polyline the left and right polygon attributes are added.
Optionally the labels of the polygons are exported as points. The point attribute table contains all original attributes.

Inputs:

A polygon feature layer
Link Field - the values of this field will be saved as Left and Right polygons for each polyline
Fuzzy tolerance - will be used to clean the polygon boundaries

Outputs:

New topologically correct Polyline feature class. Fields added to the polyline attribute table
- [ET_Left] - stores the Left polygon link values
- [ET_Right] - stores the Right polygon link values
Optional Point feature class representing the labels of the input polygons. The attributes of the input polygons are preserved in the Point Attribute Table

Notes :

The default Fuzzy tolerance is calculated from the extents of the input layer using the formulae (W + H) / 2000000 where W and H are the with and height of the extent envelope.
Larger values of the Fuzzy tolerance may be used to clean some bigger Gaps and Slivers, but it might lead to unwanted approximation of the input shapes.
A Fuzzy tolerance of 0 will be replaced by the default value
If a polyline does not have Left polygon, the value of the ET_Left field will be set to -999999999. In topologically correct polygon dataset this should indicate the outer boundary (neighboring with the so-called Universal Polygon. Values of -999999999 in the interior of the polygon dataset will indicate gaps or overlaps in the data.
If the input feature class has multi-part features and the Object ID field is used as a link field, the polylines will have for Left and Right polygons the IDs of the original polygons. The label points however will carry in the ET_ID field the IDs of the exploded polygons.

Example:

	Original polygons
	Derived polylines. Nodes in intersections No duplicates The polylines on the boundary of the area will have ET_Left = -999999999
	Polylines labeled with their Left and Right polygons. Polygons labeled with the Link field used in the function.
	Multi-part polygons. Object ID used in the function as a link field.

ToolBox implementation
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Command line syntax

ET_GPPolygonToPolylineAdvanced <input_dataset> <out_feature_class><fuzzy_tolerance> <link_field> {label_feature_class}

Parameters

Expression	Explanation
<input_dataset>	A Polyline feature class or feature layer
<out_feature_class>	A String - the full name of the output feature class.
<fuzzy_tolerance>	A Double - the gaps smaller than this tolerance will be closed. The units of the parameter are in the spatial reference of the input feature class
<link_field>	A String - the name of the field to be used as a link. The field must exists in the input feature class. The type of the field can be Short Integer , Long Integer, Double, Single, String or Object ID. The values of this field will be saved as Left and Right polygons for each polyline.
{label_feature_class}	A String - the full name of the label feature class.

Scripting syntax

ET_GPCleanContourGaps (input_dataset, out_feature_ class, fuzzy_tolerance, link_field,label_feature_class)

See the explanations above:
<> - required parameter
{} - optional parameter