I can help you with a bit of the theory. Triangulation is basically finding the intersection point of 3 circles. Each mobile tower is the center of a circle. The size of the circle is relative to the signal strength of that tower. The place where the 3 circles overlap is where the user is. … Read more
I have it, Nominatim is a tool to search OSM data by name and address and to generate synthetic addresses of OSM points (reverse geocoding). http://nominatim.openstreetmap.org/search?q=135+pilkington+avenue,+birmingham&format=json&polygon=1&addressdetails=1
UPDATED ANSWER: Wikilocation has been retired and now there is an OFFICIAL WIKIPEDIA API ? action=query & list=geosearch & gsradius=<radius-in-meters> & gscoord=<lat>|<lon> HTML example | JSON Example
The latitude must be a number between -90 and 90 and the longitude between -180 and 180.
Yes you can, by using a script field. For instance, assuming your doc have a geo-point field called location, you could use the following: (note the \u0027 is just an escaped single quote, so \u0027location\u0027 is really ‘location’) curl -XGET ‘http://127.0.0.1:9200/geonames/_search?pretty=1’ -d ‘ { “script_fields” : { “distance” : { “params” : { “lat” : … Read more
Access to location data is restricted to users who have granted you access to their location data at the time that the OAuth token was generated. You have to specifically request access to location data in the scope parameter.
Mapping IP addresses to geolocations is done via tables, where an IP maps to a particular location. This location, however, doesn’t need to be accurate, since IP addresses don’t carry any information about their locations, these are approximated. From Wikipedia’s article on Internet geolocation: The primary source for IP address data is the regional Internet … Read more
Totally free, LGPL, not easily found in google: ip2c.org
No you can’t – IP addresses get reallocated and reassigned from time to time, so the mapping of IP to location will also change over time. If you want to find out the location that an IP address currently maps to you can either download a geolocation database, such as GeoLite from MaxMind, or use … Read more
FSPL depends on two parameters: First is the frequency of radio signals；Second is the wireless transmission distance. The following formula can reflect the relationship between them. FSPL (dB) = 20log10(d) + 20log10(f) + K d = distance f = frequency K= constant that depends on the units used for d and f If d is … Read more