A method comprising: obtaining at a mobile device one or more signals comprising information indicative of a location of the mobile device; wirelessly transmitting, by the mobile device, the information indicative of the location of the mobile device to a positioning server of one or more servers; wirelessly receiving, by the mobile device, a location context identifier responsive to said transmitting of the information indicative of the location of the mobile device, the location context identifier corresponding to a localized environment at which the mobile device is located, wherein the localized environment is a locally defined area or other environment not mapped according to a global coordinate system, the location context identifier determined by the positioning server of the one or more servers based, at least in part, on the information indicative of the location of the mobile device obtained by the mobile device; wirelessly transmitting, by the mobile device, the location context identifier corresponding to the localized environment at which the mobile device is located to a location-based data server of the one or more servers; wirelessly receiving, by the mobile device from the location-based data server, location-based data responsive to said transmitting of the location context identifier corresponding to the localized environment at which the mobile device is located, the location-based data being associated with the location context identifier and pertaining to the localized environment wherein the location-based data comprises information pertaining to one or more wireless access devices corresponding to the localized environment at which the mobile device is located, the information pertaining to the one or more wireless access devices comprising locations of the one or more wireless access devices; and determining the location of the mobile device with respect to the localized environment corresponding to the location context identifier based, at least in part, on the location-based data. obtaining at a mobile device one or more signals comprising information indicative of a location of the mobile device; wirelessly transmitting, by the mobile device, the information indicative of the location of the mobile device to a positioning server of one or more servers; wirelessly receiving, by the mobile device, a location context identifier responsive to said transmitting of the information indicative of the location of the mobile device, the location context identifier corresponding to a localized environment at which the mobile device is located, wherein the localized environment is a locally defined area or other environment not mapped according to a global coordinate system, the location context identifier determined by the positioning server of the one or more servers based, at least in part, on the information indicative of the location of the mobile device obtained by the mobile device; wirelessly transmitting, by the mobile device, the location context identifier corresponding to the localized environment at which the mobile device is located to a location-based data server of the one or more servers; wirelessly receiving, by the mobile device from the location-based data server, location-based data responsive to said transmitting of the location context identifier corresponding to the localized environment at which the mobile device is located, the location-based data being associated with the location context identifier and pertaining to the localized environment wherein the location-based data comprises information pertaining to one or more wireless access devices corresponding to the localized environment at which the mobile device is located, the information pertaining to the one or more wireless access devices comprising locations of the one or more wireless access devices; and determining the location of the mobile device with respect to the localized environment corresponding to the location context identifier based, at least in part, on the location-based data.