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Track: Health Care Services
John Cartwright
State of Colorado
4300 Cherry Creek Drive South
Denver, CO 80222-1530
Telephone: 303-692-3141
Fax: 303-782-5693
E-mail: john.cartwright@state.co.us
Rick Barrett, Barbara MacRae
MSGEIS-a GIS Application to Generate Mobile Source Emission Inventories
Defining Issue: Among its other tasks, the Air Pollution Control Division of the Colorado Department of Public Health and Environment is charged with creating inventories of mobile source pollution in the Denver metro area. Given a transportation network and traffic volume data, an inventory is created that contains the total emissions for each of a number of pollutants for each link in the road network. In the past this process required many separate steps and a considerable amount of user intervention. The networks often represent alternative transportation strategies and recent years have seen a dramatic increase in the number of inventories required. Demand had increased to the point where timely results could no longer be delivered using the manual process. GIS Solution: The Air Pollution Control Division developed the Mobile Source Emission Inventory System (MSGEIS), a workstation -based solution that uses ArcInfo along with external emission factor models to automate the emission inventory
process. This application reduces the amount of user time to a bare minimum and has dramatically increased the number of inventories that the Department can process. Methodology: The application uses a graphical user interface to collect information from the user such as temperature and pollutants of interest. This dialog at the initiation of the program is the only user intervention required, and any number of networks can be processed in sequence using these same parameters. The system takes an ASCII input file created by a transportation model and builds a coverage with a few associated INFO files. Because of Colorado's high altitude and its vehicle inspection and maintenance program, multiple runs of the emission factor models are required. This complexity is managed by a shell script, which is in turn called by the main AML. For each network a coverage is created where every link is attributed with its total contribution to the mobile source inventory. In addition, the user has the option of
generating a series of summary reports based on the calculations. Software: MSGEIS was develop primarily using AML, but also incorporated scripts written in Perl, Tcl/Tk, and the UNIX shell. In addition, the Mobile5a and Part5 emission factor models are integrated into the system. The purpose of this paper is to briefly describe the system and its functionality. The emphasis, however, will be on the architecture and development of the application and the use of ArcInfo as an integrating technology.
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