In the proposed work, we compute the zip codes by reverse
geocoding the spatial data. Reverse geocoding is the process of
converting a location point to a readable address or place name. For
example, reverse geocoding latitude: 41.976216 and longitude: -
87.90331, produces the address 1-99 Access Road Chicago,
Illinois, 60666, USA. From the address, we extract the zip code
(i.e. 60666) component. This zip code extraction is done for each
bus stop, rail line, and bus route to construct the zip code index.
For reverse geocoding services, we use Yahoo’s Reverse
Geocoding API [34]