SEjARAH
Ketika perangkat selular (A) hidup akan selalu berkomunikasi dengan pemancar BTS (base transmission sistem) (B) , dari komunikasi tersebut perangkat selular kita mengirimkan data-data, baik berupa data aspasial maupun spasial, kemudian data (data spasial) yang diterima BTS akan di kirimkan ke server map (google maps) (C), yang kemudian data tersebut diolah dan ditampilkan dalam bentuk peta sesuai permintaan pada perangkat selular.
Of
course, geolocation is starting to make its way into the media world and will
have a wide impact on how publishers deliver content and advertising. But most
of us have little idea how HTML5
and mobile applications like Foursquare actually work.
Below are the four methods currently used to help pinpoint
usersBy IP Address,
Services like Firefox rely
primarily on calculating your location based on wireless access points and your
current IP address. Your IP Address is a number that is assigned to your
computer when it is participating in a connected network like, say, the Internet.
Internet service providers often are responsible for ranges of IP addresses so
many services can take your IP address and pass it through a database to then
determine your location down to a fairly broad area (think to the
county).
If you live in Westchester, New York and wonder how some online dating advertisements can say “find women in women in Westchester” it is because they are using your IP address to determine your rough location.
The latest version of HTML will encourage more browsers like Firefox to have geolocation as a default feature. Don't worry though, it will always be an opt-in experience.
See it at work here: http://ipinfodb.com/GPS
The simplest way to calculate position is using GPS coordinates. Most modern phones are GPS-enabled, and are able to send a signal to several satellites in space that help triangulate your exact position. GPS calculations typically rely on having a clear line of sight to the sky, so they can be finicky indoors.
A new “Assisted GPS” (A-GPS) system is being used to combine GPS data will cell phone signals to help increase the accuracy of GPS in cities and indoors.
See how it all works here: http://www.wmexperts.com/articles/gps_vs_agps_a_quick_tutorial.htmlCell phone towers
Calculating location based on cell phone towers, known as GSM localization, works much like GPS. A cell phone signal is triangulated between three cell phones towers to help determine the user's location.See how it all works here: http://news.bbc.co.uk/2/hi/technology/4738219.stm