Abstract
GIS Visualization for Modeling Commodity Flows from the PECAS Model
Track: Urban and Regional Planning
Authors: Grace Chung
The San Diego Association of Governments (SANDAG) is developing a small-area land use and spatial economic simulation model based on the Production, Exchange, and Consumption Allocation System (PECAS) framework. This framework models the land use changes that occur as a result of the spatial distribution of economic activity in the region. Additionally, the PECAS framework models commodity-specific origin-destination flows, including imports and exports and labor by occupation. As part of its economic allocation, PECAS produces rents by square foot for residential and nonresidential space types, as well as changes in quantities of space of each type.
In this paper, a GIS visualization model is developed to show the geographic flow of labor and other selected commodities, and changes in the exchange prices for these commodities. Through the visualizations, viewers can identify the hot spots for the exchange of labor, selected commodities and floor space in the San Diego region.