Atlanta Public Transit Equity Explorer

Center for Spatial Planning Analytics and Visualization

Conventional Public Transit System

On-demand Multimodal Transit System

Transit Inequity: demand-supply gap Help

Current

ODMTS

Transit Inequality by Level of Demand Help

Current

ODMTS

Low-demand neighborhoods

Mid-demand neighborhoods

High-demand neighborhoods

Transit demand type

Transit demand unit

Trip type

Accesibility Type

Accessible within minutes

30 minutes 75 minutes

Accessible within X driving time

Equal 3 times

Help

How is the 'Transit Inequality' measured?

×
  • The numeric values are Gap indices that summarize the overall gap between transit supply (i.e., accessibility) and demand, which is measured by:

    $$ \sum_{i=1}^n(\mid ServiceSupply_{i}^{percentile}\mid - \mid ServiceDemand_{i}^{percentile}\mid) \over n $$

  • The Gap index ranges from 0 to 1, where a value of 1 represents total inequity.
  • The scatterplot shows how the transit service supply is distributed with respect to the transit demand variable.

Transit Inequity: demand-supply gap Help

Current

ODMTS

How is the 'Transit Inequality' measured?

×
  • The numeric values are Gini indices which represent the degree of inequality among neighborhoods with low/mid/high transit demand, respectively.
  • A high value of Gini index means the distribution is far from equal.
  • The plot is showing Lorenz curves which also indicate the degree of inequality based on how far it is from the line of equality.

Transit Inequality by Level of Demand Help

Current

ODMTS

Low-demand neighborhoods

Mid-demand neighborhoods

High-demand neighborhoods

How does the legend work?

×
  • The legend shows the level of transit accessibility and transit demand that each Block Group falls under
  • Purple means transit is over-supplied compared to the low transit demand
  • Red means transit is under-spplied compared to the high transit demand
  • Ivory means transit supply corresponds to the transit demand
  • Click each of the nine boxes to highlight neighborhoods in each category; or click each circle on the axes to highlight by row/column