thx Posted November 6, 2003 Report Share Posted November 6, 2003 Hi, all! I'm programming a radar to keep track of AI traffic. Anyone know the BEST code for determining the MOST ACCURATE distance of AI based on both our LAT and LON's?? I want to be quite specific cuz I'm using distance trend data to perform trajectory projection and closure rate calculations... Is there another way to get accurate AI traffic distances? I'm coding in VB using FSUIPC. Thanks! Danny Link to comment Share on other sites More sharing options...
jd Posted November 6, 2003 Report Share Posted November 6, 2003 this is what i use Public Function fix_to_fix_distance(lat1 As Single, lon1 As Single, lat2 As Single, lon2 As Single) As Single Dim pi As Double Dim degtorad As Double Dim latx1 As Double Dim latx2 As Double Dim lonx1 As Double Dim lonx2 As Double pi = 3.1415926535 degtorad = (pi / 180) latx1 = lat1 * degtorad latx2 = lat2 * degtorad lonx1 = -lon1 * degtorad lonx2 = -lon2 * degtorad fix_to_fix_distance = ArcCos((Sin(latx1) * Sin(latx2)) + (Cos(latx1) * Cos(latx2) * Cos(lonx1 - lonx2))) fix_to_fix_distance = fix_to_fix_distance * 180 * 60 / pi End Function Link to comment Share on other sites More sharing options...
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