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visualizing job accessibility with

visualizing job accessibility with. GIS. linthicum plan512 July 2006. who lives where?. population available from 2000 Census tracts. who works where?. job locations available by tract from 2000 CTPP. jobs/housing balance. jobs to total population by Census tract.

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visualizing job accessibility with

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  1. visualizing job accessibility with GIS linthicum plan512 July 2006

  2. who lives where? population available from 2000 Census tracts

  3. who works where? job locations available by tract from 2000 CTPP

  4. jobs/housing balance jobs to total population by Census tract

  5. what does this data explain? job housing balance distribution density what doesn’t it explain? consideration of costs (travel time) access to jobs in other districts access to jobs by mode

  6. O1 O2 O3 O4 what is job accessibility? accessibility – number of opportunities within a certain distance or travel time(1) Ai – accessibility of zone I Oj – opportunities at zone j dij – distance between zones λ – friction factor A1 (1) Hanson, Susan. “The Context of Urban Travel: Concepts and Recent Trends.” Geography of Urban Transportation, Third Edition, Susan Hanson and Genevieve Giuliano, Editors. New York: The Guilford Press. 2004. pp 4-7

  7. how to calculate λ the interaction formula becomes plot/regress ln(I) vs ln(d) to calculate the slope λ All Modes λ = -0.404 Auto λ = -0.293 Non-Auto λ = -0.251

  8. job accessibility – by all modes All Modes λ = -0.404

  9. job accessibility – by automobile Auto λ = -0.293

  10. job accessibility – by non-auto Non-Auto λ = -0.251

  11. accessibility analysis shortcomings treats everyone in a tract as if they have the same mobility does not consider temporal variations such as peak / non-peak travel requires significant amounts of data does not distinguish between voluntary and necessary travel

  12. questions?

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