1. A method for generating map data, the method comprising: receiving visual data from a device, wherein the visual data is tagged with information comprising source identifying information associated with an at least one signal emitting device; identifying at least one visual feature from the visual data; determining a coordinate on a map at which the visual data was acquired based on identifying the at least one visual feature from the visual data; and associating the coordinate on the map with the information associated with the at least one signal emitting device.