The IRPUD model projects the location decisions of industry, residential developers and households, the travel patterns that result from location decisions, construction activity and land-use development, and the impacts of public policies in the fields of industrial development, housing, public facilities, and transportation within an urban area over a specified amount of time.
The IRPUD model consists of six integrated submodels that address the following factors: transportation; changes to population, employment, residential buildings and non-residential buildings due to biological, technological or long-term socioeconomic trends; public programs; private construction; regional labor market; and regional housing market. Together, the six submodels form one comprehensive stand-alone model system.
General Info
Developers:
Michael Wegener
Website:
irpud.raumplanung.uni-dortmund.de/irpud/index_e.htm
Email:
mw@irpud.rp.uni-dortmund.de
Strengths:
• The IRPUD model studies the impacts of policies from the fields of industrial development, housing, public facilities, and transportation. The model addresses global policies (i.e., those that affect urban development in the whole region) and local policies (i.e., regulatory or direct zone-specific investment projects).
• The IRPUD model differs from other operational urban models due to its high temporal resolution and its full integration of land-use transport interaction in each simulation period. This makes it a truly dynamic model (compared with other approaches, such as cross-sectional equilibrium approaches).
• The IRPUD model introduces assumptions about human spatial behavior drawn from time-space geography based on time and cost budgets and satisfying behavior into urban modeling. This makes the model uniquely suitable to model elastic trip generation behavior (responsible for much of the growth in mobility in metropolitan regions).
Outputs:
The IRPUD model generates graphical and tabular outputs. Graphical outputs are in the form of trajectories-curves representing the development of a particular model variable or output indicator over time-or maps. The table below lists examples of indicators that a user can select for output. Tabular output is in the form of ASCII printer output files. Graphical output is either on-screen or in WordPerfect WPG format for later post-processing and printing. In addition, custom-written programs are used to extract model results from the model data base for mapping.
Resources
User Input Requirements:
The user of the IRPUD model must provide four groups of data as inputs: model parameters, regional data, zonal data and network data. The table below presents the types of inputs that fall into each of these groups. All user input is in the form of ASCII files.
Time Commitment:
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Data Input Requirements:
Model Parameters
These inputs influence the model equations contained in the IRPUD model.
• Demographic parameters
• Household parameters
• Housing parameters
• Technical parameters
• Monetary parameters
• Preference parameters
Zonal Data
This information describes activities in the urban region undergoing analysis during the base year simulated by the IRPUD model. Each zone in the urban region must have the following information:
• Population
• Labor force/unemployment
• Households
• Dwellings
• Households/housing
• Employment/workplaces
• Public facilities
• Land use
• Rents/prices
Regional Data
The IRPUD model requires information on the total urban region to project intraregional changes.
• Employment
• Immigration
• Outmigration
Network Data
modes car, public transportation and walk/bicycle. The model codes the following network information link by link using a multimodal coding scheme:
• Link type
• From-node
• To-node
• Link length
• Link travel time (public transportation)
• Base speed (road)
For each public transportation line, the IRPUD model codes the following information:
• List of nodes
• Peak-hour headway
Equipment Needs:
The IRPUD model requires a 300 MHz or higher PC with 128 MB or more RAM, 4 GB or more hard drive space, color monitor (1024x768), color printer, Windows NT operating system, programming language compilers (e.g., Fortran, C, C++), and statistical analysis software (e.g., SAS, SPSS). In addition, a geographical information system (e.g., ArcInfo) is used to prepare the data needed to run the model. The model has its own result representation and analysis tools.
Limitations:
• Limitations of the present version of the IRPUD model include its coarse spatial resolution and its lack of a submodel of urban freight transportation. The model developer is addressing both limitations in the ongoing revision of the model through the PROPOLIS project.
Staff Requirements:
The consulting services of the model developer are required to use the IRPUD model. The use and calibration of the model by the user requires land use modeling expertise.
Software Cost:
The IRPUD model is a research model developed through academic research projects funded by the German National Research Council. It is not available for purchase off-the-shelf as a self-contained software package. It is presently being used in a research project funded by the European Commission. In future projects, the IRPUD model will be included as a component of overall consulting services by the model developer, with the price of the overall consulting services being set on a project-by-project basis depending on several factors, including the needs of the client, the size of the study area, and the amount and condition of the data available for incorporation into the system.
Preview:
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Maintenance Costs:
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