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Transfer Polygon Attributes Wizard

Transfers the attributes from one polygon layer (source) to another (target) based on their spatial location (overlay). The user specifies the method for transferring the attributes of each field of the source polygon attribute table.

Inputs:

• Target layer - a polygon layer that will receive the attributes
• Source layer - a polygon layer which attributes will be transferred to the target layer
• Fields which values will be transferred
• The method that will be used to transfer the values for each field. The methods are discussed below
  • Count (only for numeric fields)
  • Value (only for numeric fields)
  • Type

Outputs:

• New  Polygon feature class. 
  • All the attributes of the Target layer are preserved
  • The fields of the Source layer selected for transfer will be added to the attribute table and their values will be calculated based on the transfer method specified

Transfer Methods:

The Source dataset has two polygons  A and B. The Target dataset has a single polygon - Z. The portion of the Target polygon that intersects with polygon "A" of the Source layer is polygon X, and the portion that intersects with polygon B is polygon Y.

• Count (sum proportion) - Typical application - transferring census data.

population_Z = population_A * area_X  / area_A +  population_B * area_Y / area_B

• Value (weighted average) -  Typical application - transferring rainfall data

rainfall_Z = (rainfall_A * area_X   +  rainfall_B * area_Y ) / area_Z

• Type (majority) - Typical application - transferring text data (soil type etc.)

IF area_X  / area_Z > area_Y / area_Z   THEN  soiltype_Z = soiltype_A

IF area_X  / area_Z < area_Y / area_Z   THEN  soiltype_Z = soiltype_B

Notes:

• In order correct results to be obtained both Source and Target datasets should be clean from overlaps
• The procedure performs cleaning of both Source and Target datasets to avoid incorrect results. The cleaning is performed on temporary datasets. No changes are applied to the input data. If the target dataset has overlapping polygons, a new polygon representing the overlap will be created in the output polygon dataset
• The spatial references of the Source and the Target datasets must have the same geographic coordinate system

Example:

	Source Data Transfer Methods County - Type Population - Count Rainfall - Value
	Results