SCAG develops and applies state-of-the-art models, integrated into a comprehensive modeling and forecasting framework (see the chart below) to develop growth projections, travel forecasts, and emissions estimates to support the Region’s various planning programs.

Model System and Integration Flowchart

Within this integrated modeling and forecasting system, SPM serves as a conduit between local jurisdictions and key SCAG models by:

  • Delivering locally vetted data and plans to key SCAG models for the analysis of plan performances to ensure that regional plans are consistent with local data and policy inputs; and
  • Providing directional and order-of-magnitude impacts of local land use and policy decisions that will assist in the development of regional plans and associated scenario analysis.

Click each model below to learn more:

Small Area Forecasting Model

Small Area Forecasting Model

SCAG develops, refines and maintains regional and small area socio-economic forecasting and allocation models to develop socioeconomic estimates and growth projections for cities, transportation analysis zones and below.
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Land Use Model

Land Use Model

SCAG Land Use Model provides a guide to socioeconomic forecasts under constrained and unconstrained conditions, and region-wide impact analysis for policy scenarios.
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Transportation Model

Transportation Model

SCAG develops and maintains state-of-the art transportation models including Trip-Based Model, Activity-Based Model, Subregional Modeling Tool, and Heavy-Duty Truck Model.
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Air Quality Model

Air Quality Model

SCAG is responsible for the Transportation Air Quality Conformity Determination on the Regional Transportation Plan (RTP) and the Federal Transportation Improvement Program (FTIP).
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