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Gradual rasterization: redefining spatial resolution in transport modelling

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  • Rolf Moeckel
  • Rick Donnelly

Abstract

It is a challenge to find the appropriate level of spatial resolution in transport modelling. While the zone system has substantial influence on model results, the resolution and design of zones is rarely analyzed systematically, and even less commonly adjusted to a specific modelling need. In this paper we present a new methodology to automatically create a new zone system based on the quadtree algorithm specific to transport modelling. Gradual raster cells are generated, where smaller raster cells tend to be used in urban areas and larger raster cells dominate in low-density, rural areas. As changing the zonal resolution affects the number of intrazonal and interzonal trips, an algorithm has been developed that adjusts intrazonal trips in line with the network resolution. Trip tables of a travel demand model for the state of Georgia, USA were disaggregated using this new zone system of gradual raster cells. The traffic assignment results validate significantly better than when using the original zone system.

Suggested Citation

  • Rolf Moeckel & Rick Donnelly, 2015. "Gradual rasterization: redefining spatial resolution in transport modelling," Environment and Planning B, , vol. 42(5), pages 888-903, September.
    • Handle: RePEc:sae:envirb:v:42:y:2015:i:5:p:888-903
    DOI: 10.1068/b130199p
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    References listed on IDEAS

    as
    1. Rolf Moeckel, 2013. "Firm Location Choice Versus Job Location Choice in Microscopic Simulation Models," Advances in Spatial Science, in: Francesca Pagliara & Michiel de Bok & David Simmonds & Alan Wilson (ed.), Employment Location in Cities and Regions, edition 127, chapter 0, pages 223-242, Springer.
    2. Lovelace, Robin & Ballas, Dimitris & Watson, Matt, 2014. "A spatial microsimulation approach for the analysis of commuter patterns: from individual to regional levels," Journal of Transport Geography, Elsevier, vol. 34(C), pages 282-296.
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