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Aggregate Polygons

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

Combines the polygons that are within the user specified distance into new polygons. Can be used also to generalize buildings.

Inputs:

• A polygon feature class
• Aggregation distance. The polygons that are closer to each other than this distance will be combined
• Minimum area of the holes to be preserved - all holes with area less than this tolerance will be removed. 

Outputs:

• New  polygon feature class 

Notes: 

• The new feature class will not have any attributes. The Transfer Attributes function can be used to get summarized attributes from the original polygons.
• The Aggregation distance and the Minimum area of holes should be specified in the units of the spatial reference of the input feature class
• If no Minimum area of holes is specified only the holes with area  smaller than 2 x Aggregation distance x Aggregation distance will be removed
• The function is CPU and RAM intensive. Using it on large datasets might need long processing time. 

Examples:

• General polygons

Input Dataset	Result (No Minimum area of holes specified)	Result (Minimum area of holes specified)

• Buildings

Input Dataset	Aggregate distance = 1 meter	Aggregate distance = 5 meters	Aggregate distance = 10 m	Aggregate distance = 20 m