SPM is a web-based scenario development, modeling, and data
organization tool developed to facilitate informed and
collaborative planning among counties/subregions, local
jurisdictions, other stakeholders, and the public. Built on
open-source software platforms, SPM includes a suite of tools and
analytical engines that help to quickly illustrate alternative
plans and policies and to estimate their transportation,
environmental, fiscal, public health, and community impacts.
Moreover, SPM provides a common data framework within which local
planning efforts can be easily integrated and synced with
regional plans.
Background
Senate Bill (SB) 375, which was passed by the California
Legislature and signed into law by the Governor in September
2008, requires each Metropolitan Planning Organization (MPO) to
develop a Sustainable Communities Strategy (SCS) for reducing
carbon emissions. Under SB375, each MPO needs to provide the
public with the necessary modeling information and tools for an
informed assessment of the issues and policy choices in the
development of SCS. Accordingly, in Spring 2011, SCAG developed
the Local Sustainability Planning Tool (LSPT), a GIS-based sketch
planning tool that allows users to create land use scenarios and
analyze their impacts. Provided with preliminary scenarios of
their planning areas, local planners were able to create, modify,
and compare different land use scenarios and their subsequent
impacts on vehicle ownership, vehicle miles traveled (VMT), mode
use and GHG emissions. This allowed the local government
participation in the development of the 2012 -2035 RTP/SCS to be
far more fruitful than it otherwise would have been.
When SCAG initiated the 2016-2040 Regional Transportation
Plan/Sustainable Communities Strategy (RTP/SCS) process,
additional functional and analytical needs were identified to
better foster the creation of a highly realistic and
implementable SCS through a “bottom-up” approach. After the
thorough review of scenario planning models and tools in
practice, SCAG joined other major Metropolitan Planning
Organizations (MPOs) in California – Sacramento Area Council of
Governments (SACOG) and San Diego Association of Government
(SANDAG) – in the enhancement and customization of
the open-source version of UrbanFootprint . In order to
make the customized tool useful to subregions and local
jurisdictions, SCAG formed a Working Group in 2013 that included
representatives from all counties and subregions in the SCAG
region to serve as an advisory group on functional and
operational aspects of the model. The Working Group offered an
invaluable source of support and guidance in the development and
implementation of UrbanFootprint based SCAG Scenario Planning
Model (SPM).
Primary Purpose And Current Use
The primary purpose of SPM is to enhance the Region’s ability to
address complex issues and evolving challenges by providing
better information about alternative future scenarios and by
building an improved linkage between local and regional planning.
Within SCAG’s integrated modeling
and forecasting system, SPM serves as a conduit for the
delivery of up-to-date and locally vetted data and plans to key
SCAG models by: delivering locally vetted data and plans to key
SCAG models 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.
SPM was initially deployed as two separate web services – SPM
Data Management (SPM-DM) and SPM Scenario Development and
Analysis (SPM-SD). SPM-DM tool was released in late 2017 to all
local jurisdictions in the SCAG region to support the 2020
Connect SoCal (or 2020-2045 RTP/SCS) process by providing a
common platform to share, review, update and disseminate data
between SCAG and local jurisdictions. SPM-DM was instrumental in
the timely and efficient review of and decision on important plan
datasets and had supported in building a local-regional database
connection until it was sunsetted in 2022. SPM-SD tool
incorporates multiple analytical modules that produce a variety
of critical metrics to inform and envision possible futures under
different demographic growth, land use, and transportation
scenarios. SPM-SD has primarily been used for regional plan
development and analysis activities and remains to play an
important role in facilitating scenario creation and editing with
advanced analytic capabilities.