Implementation of Haversine Formula on the Limitation of E-Voting Radius Based on Android

The evolution of Information Technology (IT) has enabled the development of an electronic voting system involving festival visitors as voters. Electronic voting (e-voting) is the application of voting that refers to the use of information technology. The use of android smartphone for e-voting can be an option, because it already combines computer and internet network in one single device. The android smartphone has a device id that can be enabled to avoid multiple voters. Restrictions on the distance or radius of voters to festivals are allowed to vote, using Location Based Service (LBS) technology from GPS smartphone voters. But the number generated by LBS is still the number of coordinates in the form of latitude and longitude, then it takes a conversion to change the coordinates into distances or radius in meters. One method of converting coordinates into distances can use Haversine formulas. Implementation of e-voting is made in the form of android application. Stage as the center point of coordinates. Visitors at a distance or radius determined by the committee are counted as voters. The voters who are outside the radius that has been determined by the committee not as a voter. Therefore, limiting the radius of the voters to the Haversine formula can be applied to e-voting.