The areas in a city vary by time of day and the starting point of the trip. Certain parts of the city go dark depending on the time of day and how long one is willing to spend on a trip. The variability of access to particular parts of the city can affect the ease of access to social services, grocery stores, household services, and employment centers.
Use the map below to explore reachability by changing the start location, as well as other parameters. The area that is not shaded is the reachable area by a person given the preferred walking speed of 1.23 meters per second.
To determine reachability from an arbitrary point, click on the map to add a 'you are here' marker. Drag it around to change the position. Changing the parameters in the form below the map will interactively update the map, as well as the count of places reachable in the neighboring legend.
Try clicking/dragging the marker around Madison to see how location changes reachability of destinations in Madison. Note how the reachability counts change in the legend. Next, try dragging the slider to change the time of day that a trip starts at. The size of the circles signifies the reachable area by walking, radiating from a reachable bus stop.
Clicking on the circles will display detailed information, and clicking on bus routes will yield a link to the official bus route page.
The following sites were instrumental in getting this implementation up and running:
There are a couple things still that can be implemented, while the majority of the technical work to gather the data has been done:
5/1/2014: Cloudmade removed access to their styled map tiles, so the map above now uses the OSM defaults.
If you have any comments, please let me know!! I would love to hear suggestions of things you would find neat to do with this map. My e-mail: firstname.lastname@example.org (HTML-encoded, so hopefully the bots don't get it :))
Reachable Areas Accessible by Transit in Madison by Alper Sarikaya is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
Based on a work at http://cs.wisc.edu/~sarikaya/new/transit.php