The development of a Geographic Information System (GIS) based system to relate the travel demand modeling process with air quality analysis - specifically with respect to carbon monoxide (CO) - is discussed in this paper. A case study of the Las Vegas (NV) metropolitan area is used to demonstrate the development and application of the system. This area has been designated to be in non-attainment of the National Ambient Air Quality Standards (NAAQS) for CO. This necessitates the development of a State Implementation Plan (SIP) which identifies plans for attaining comformity with NAAQS. Transportation sources of emissions account for a vast majority (greater than 90%) of the CO emissions in the Las Vegas valley. Thus, the development of a SIP requires explicit consideration of travel demand, vehicular emissions and dispersion models. This paper documents the linking of tools and models that could be used to support such efforts. The models include TRANPLAN (a travel demand forecasting model) and the Urban Airshed Model, UAM (used for dispersion modeling to calculate concentrations of pollutants). Due to the powerful capabilities afforded by a GIS to manage, manipulate, analyze and display spatial data and due to the spatial nature of data required to support the analysis and modeling processes described above, a GIS environment was a logical chice for developing the model linkages. ARC/INFO was the GIS program selected for implementing the system. The system incorporates inputs to and outputs from UAM into the GIS environment. It combines this information with other travel demand, demographic, and land use data. This facilitates evaluation of the impact or effectiveness of policies ranging from land use planning/ zoning alternatives to travel demand management strategies on CO concentrations in the valley. The paper also documents problems and issues encountered in developing the system.


  • English

Media Info

  • Features: Figures; References;
  • Pagination: p. 307-316

Subject/Index Terms

Filing Info

  • Accession Number: 00727031
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 2 1996 12:00AM