1. A method for generating map data, the method comprising: receiving visual data captured by a camera coupled to a device, wherein the visual data is tagged with source identifying information associated with a wireless access point other than the device by including the source identifying information in metadata attached to the visual data, wherein the metadata describes attributes associated with the visual data; acquiring the source identifying information associated with the wireless access point from the metadata attached to the visual data; 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 source identifying information associated with the wireless access point acquired from the metadata attached to the visual data.