BuildPolygon

Build Polygons

Builds polygon layer from a polyline layer

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

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 function.
- 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 will snap the dangling nodes to the closest polylines only if they are withing the Fuzzy tolerance, therefore it is very important to use Clean Dangling Nodes function in order to ensure that there will be no loss of data.
- The third step is the actual building of the polygons
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.

Source Polyline Layer

Result Polygon Layer

Parameters

Expression	Explanation
Function Name	BuildPolygons
<input dataset>	A String representing the input layer. Must be of Polyline type.
<output dataset>	A String - the full name of the output layer.
<Fuzzy Tolerance>	A Double representing the Fuzzy tolerance (in the units of the input dataset) to be used to resolve intersections.
{Label Points}	A point layer to be used as a source for the polygon attributes.

ETGWPath used in the table below is the full path to ETGWRun.exe (E.G. "C:\Program Files\ETSpatial Techniques\ETGeo Wizards\ETGWRun.exe")

Language	Syntax
Python	subprocess.call([ETGWPath, "BuildPolygons", "input dataset", "output dataset", "Fuzzy Tolerance", "Label Points"])
.NET using ETGWRun.exe	StartInfo.FileName = ETGWPath StartInfo.Arguments = "BuildPolygons" "input dataset" "output dataset" "Fuzzy Tolerance" "Label Points"
.NET using ETGWOutX.dll	BuildPolygons(input dataset, output dataset, Fuzzy Tolerance, Label Points)
ArcPy	arcpy.BuildPolygons(input dataset, output dataset, "Fuzzy Tolerance", "Label Points")

Notes:

<> - required parameter
{} - optional parameter
See examples for Python , .NET or ArcPy
The argument separator for StartInfo.Arguments is space. If a string might contain a space, you need to double quote it.