Hi
Tom, in Atlanta, we have developed an algorithm for TAZ disaggregation, which
basically consists in a GIS- based
regional control
forecast
allocation tool, currently operable as an ESRI ArcMap 9.3 extension with the requirement of a Spatial
Analyst license,
and written in VB.net. The tool uses a tab structure in the form of a GUI
interface to load data, to set and calibrate the model parameters, to run the spatial
allocation model,
and to generate an animation of results. It furthermore provides an optimal
weighting matrix, for a predetermined set of spatial influence layers, that
most replicates historical time series spatial growth patterns. Currently, our TAZ-D
extension makes the user adjust the shares (by Superdistrict area) of control
totals of employment and households manually, with subsequent machine
interpolation of the shares matrix. This interpolation function tool will be
improved so that rebalancing of shares between Superdistricts occurs in a more
automated fashion.
Additional
details are available at:
http://www.ampo.org/assets/604_arctazdisaggregator.pdf
Animation
of results & visualization examples are available at:
http://www.youtube.com/user/ARCModeling
Thanks,
Guy
Guy
Rousseau
Traffic
Modeling Manager
Atlanta
Regional Commission
From:
ctpp-news-bounces@chrispy.net [mailto:ctpp-news-bounces@chrispy.net] On
Behalf Of Tom Krenzke
Sent: Tuesday, February 23, 2010 6:13 PM
To: ctpp-news@chrispy.net
Subject: [CTPP] Aggregating Census TAZs
Has anyone tried aggregating Census TAZs for the nation into
something larger (e.g., 20K in population) that still makes sense for
transportation planning (e.g., corridors, MIS, Districts, planning areas etc.)?
Or do you have an algorithm that combines TAZs? If you do, would you have
a correspondence file to share with us, and the purpose for which this
aggregation was made?
Thanks,
--Tom Krenzke
Westat