Retail Gravity Models and GIS. Jonathan Dorwart GIS Analyst / Planner Wikstrom Planning and Economic Consultants April 5, 2007. Retail Gravity Models and GIS. Typical market analysis estimates competitive position on the basis of trade areas…. 5 min. 10 min. 15 min. Travel time….
GIS Analyst / Planner
Wikstrom Planning and Economic Consultants
April 5, 2007
Fixed radii and breakpoints…
Sales data from individuals…
Why develop a gravity model in GIS to model retail competition?
Estimating the friction of distance using multiple linear regression… Gravity model’s multiplicative nature allows log linear form to be taken, which can be regressed upon.
For the sake of simplicity many stores were aggregated into shopping centers/areas. Strip nature of retail development and point based representation used in gravity model is problematic.
This is an example of a simplified dasymetric map –current urban land use constrains population density