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Build Polygon

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Builds polygon feature class from a polyline layer

Inputs:

• A polyline feature layer
• Optional point dataset that represents polygon labels and is to be used for attaching attributes to the resulting polygons.

Outputs:

• New polygon feature class

Notes :

• The process goes through several steps
  • Cleans the polyline theme with user specified Fuzzy tolerance  - creates intersections and removes duplicate polylines. It is highly recommended the polyline layer to be cleaned beforehand with the Clean Polyline Wizard.
  • During the second step the process removes all non polygon elements. All the polylines having a dangling node will be removed. Note that the function do not make an attempt to snap the dangling nodes to the closest polylines, therefore it is very important to use Clean Dangling Nodes function in order to be ensured that there will be no loss of data. The process of removing non polygon elements might go through several iterations, because in many cases removing one dangling polyline makes another polyline dangling.
  • The third step is the actual  building of the polygons
  • The forth step cleans the resulting polygon feature class from some minor inconsistencies
• Although not required three data preparation steps are very important as mentioned above
  • Use Clean Polyline function to clean the input polyline data set.
  • Use Clean Dangling Nodes function to clean all dangling polylines.
  • Use Export Nodes function to verify that all the polylines are correctly connected.

Example:

Source Polyline Layer	Result Polygon Layer

ToolBox implementation

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Command line syntax

ET_GPBuildPolygons <input_dataset> <out_feature class> {clean_polylines} {fuzzy_tolerance}

Parameters

Scripting syntax

ET_GPBuildPolygons (input_dataset, out_feature class, clean_polylines, fuzzy_tolerance,label_points)

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