A tool that prepares data for an areal interpolation

http://www.mediafire.com/?1s6n2kc891yg4oa

(C) Copyright: Jong-Geun Kim. 2006-2011. All rights reserved.

This tool cannot be used for any commercial purposes without a written permission of the author. Contact the author (j g k i m 2 5 at gmail.com) for any questions.
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This is a ArcGIS tool developed by model builder that prepares data for an areal interpolation. This tool requires two polygon feature classes (FC) and overlays the two. Originally base FC is assumed to be Traffic Analysis Zone (TAZ) while source FC being a census FC (tracts). Source FC must have a field representing population for each feature.

This tool transfers source FC's attributes to base FC while estimating the proportion of population (Pop_Portion) in the overlaid area. This Pop_portion value can be interpreted as the proportion of souce FC's contribution to the base FC. Implicit assumption is that each feature in the source FC has an even distribution of population, which is not necessarily the case with the featuers in the base FC.

Once Pop_portion fied is populated by this tool, next steps are 1) multiply an attribute field with the Pop_portion; 2) summarize the product by the case field uniquely assigned for base FC (e.g: TAZ_Name).