Compile a list of data layers and attributes that would likely be included in a GIS for:
(a) Selecting the optimum corridor for constructing a new rapid-transit system to connect two major cities.
(b) Choosing the best location for a new airport in a large metropolitan area.
(c) Routing a fleet of school buses.
(d) Selecting the fastest routes for reaching locations of fires from various fire stations in a large city.