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haversine formula distance between two points. Where DlatDifference lat1 lat2 difference of latitude DlonDifference lon1 lon2 difference of longitude R is radius of earth ie 6371 KM or 3961 miles. A sin²DlatDifference2 coslat1coslt2sin²DlonDifference2 c 2atan2a 1a d Rc.
We start by discussing the problem of measuring distances between points in Cartesian and polar coordinate systems. Calculate the closest position to user. F 2 asin sin f 1 cos d cos f 1 sin d cos th l 2 l 1 atan2 sin th sin d cos f 1 cos d sin f 1 sin f 2 where.
Where DlatDifference lat1 lat2 difference of latitude DlonDifference lon1 lon2 difference of longitude R is radius of earth ie 6371 KM or 3961 miles.
C. The two points are specified by their latitude and longitude in degrees. F 2 asin sin f 1 cos d cos f 1 sin d cos th l 2 l 1 atan2 sin th sin d cos f 1 cos d sin f 1 sin f 2 where. If youre close to the pole or computing longer distances you should use a different library.