createCenterlines

Not available in the versions of ET GeoWizards for ArcGIS 8.x

Creates centerlines from polygon features.

Inputs:

A polygon feature class.
Maximum Width.
Minimum Width.
Centerline type
- Inside - the centerlines will be created inside the polygons - suitable for deriving centerlines from rivers and streets represented by polygons
- Outside - the centerlines will be created in the gaps between polygons - suitable for deriving street centerlines from cadastral data.

Outputs:

Notes:

If the "Inside" option is used, the input polygons should represent linear by nature features (rivers, roads, etc.)
If the "Outside" option is used, the gaps between the input polygons should represent linear by nature features (streets, etc.)
The new feature class will not have any attributes.
Maximum and Minimum widths should be specified in the units of the spatial reference of the input feature class
Use reasonable for your data Maximum and Minimum widths.
The results might contain some unwanted lines. Inspect the results and remove undesired features.
An option is available for smoothing the resulting centerlines. It is recommended not to use this option, but use the Smooth Polylines function after inspecting the results.
The function is CPU and RAM intensive. Using it on large datasets might need long processing time.

Examples:

Input Dataset	Result	Result (Detail)

Input Dataset	Result	Result (Detail)

ToolBox implementation
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Command line syntax

ET_GPCreateCenterlines <input_dataset> <out_feature class> <maximum_width> <minimum_width> <centerlines_type> {smooth_centerlines}

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 (A feature class with the same full name should not exist)
<maximum_width>	A Double representing the aggregation distance. The polygons that are closer to each other than this distance will be combined
<minimum_width>	A Double representing the minimum area of holes to be preserved. All holes with area less than this tolerance will be removed.
<centerlines_type>	Required. A String indicating the type of centerlines to be created. Case sensitive. Inside - the centerlines will be created inside the polygons - suitable for deriving centerlines from rivers and streets represented by polygons Outside - the centerlines will be created in the gaps between polygons - suitable for deriving street centerlines from cadastral data.
{smooth_centerlines}	A Boolean indicating whether the resulting centerlines will be smoothed. B-Spline smoothing algorithm is used

Scripting syntax

ET_GPCreateCenterlines (input_dataset, out_feature class, maximum_width, minimum_width,centerlines_type, smooth_centerlines )

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