public Coordinate(LatLonCoordinate coords)
{
var xDist = GetLonDistance(coords);
var yDist = Distance.Measure(coords, new LatLonCoordinate(-90f, coords.Long));
X = (long)xDist.InMeters;
Y = (long)yDist.InMeters;
FractionX = (float)(xDist.InMeters % 1);
FractionY = (float)(yDist.InMeters % 1);
}
private static Distance GetLonDistance(LatLonCoordinate coords)
{
if (coords.Long < 180f)
{
return(Distance.Measure(coords, new LatLonCoordinate(coords.Lat, 0.0)));
}
else
{
return(Distance.Measure(coords, new LatLonCoordinate(coords.Lat, 180)) +
Distance.Measure(new LatLonCoordinate(coords.Lat, 180), new LatLonCoordinate(coords.Lat, 0)));
}
}
public static Distance Measure(LatLonCoordinate p0, LatLonCoordinate p1)
{
var deltaLat = ToRad(p1.Lat - p0.Lat);
var deltaLong = ToRad(p1.Long - p0.Long);
var a = Math.Pow(Math.Sin(deltaLat / 2), 2) +
Math.Cos(ToRad(p0.Lat)) * Math.Cos(ToRad(p1.Lat)) *
Math.Pow(Math.Sin(deltaLong / 2), 2);
var c = 2 * Math.Atan2(Math.Sqrt(a), Math.Sqrt(1 - a));
return(Distance.FromKm(EarthRadius * c));
}
