public static double Distance(
Coords loc1,
Coords loc2,
UnitSystem unitSystem = UnitSystem.SI,
DistanceFormula distanceFormula =
DistanceFormula.SphericalEarthProjection)
{
switch (distanceFormula)
{
case DistanceFormula.Haversine:
return(DistanceHaversine(loc1, loc2, unitSystem));
case DistanceFormula.SphericalEarthProjection:
return(DistanceSEP(loc1, loc2, unitSystem));
case DistanceFormula.SphericalLawOfCosines:
return(DistanceSLC(loc1, loc2, unitSystem));
default:
return(DistanceSEP(loc1, loc2, unitSystem));
}
}
/// <summary>
/// Returns the distance between the latitude and longitude coordinates that are specified by this GeoCoordinate and
/// another specified GeoCoordinate using the defined formula
/// </summary>
/// <returns>
/// The distance between the two coordinates, in meters.
/// </returns>
/// <param name="other">The GeoCoordinate for the location to calculate the distance to.</param>
/// <param name="Formula">The formula to use to calculate distance</param>
public double GetDistanceTo(GeoCoordinate other, DistanceFormula distanceFormula)
{
if (double.IsNaN(Latitude) || double.IsNaN(Longitude) || double.IsNaN(other.Latitude) ||
double.IsNaN(other.Longitude))
{
throw new ArgumentException("Argument latitude or longitude is not a number");
}
switch (distanceFormula)
{
case DistanceFormula.Haversine:
return(GetDistanceHaversine(other));
case DistanceFormula.SphericalLawOfCosinus:
return(GetDistanceSphericalLawOfCosines(other));
case DistanceFormula.Vicenty:
return(GetDistanceVicenty(other));
default:
throw new NotImplementedException();
}
}
public IOrderedEnumerable <NodeDistance <KDTreeNode <Face> > > GetNeighbors(double[] query, DistanceFormula distanceFormula)
{
/* https://scikit-learn.org/stable/modules/generated/sklearn.neighbors.DistanceMetric.html */
sw.Restart();
switch (distanceFormula)
{
case DistanceFormula.Manhattan:
Tree.Distance = new Accord.Math.Distances.Manhattan();
break;
case DistanceFormula.Euclidean:
Tree.Distance = new Accord.Math.Distances.Euclidean();
break;
case DistanceFormula.Chebyshev:
Tree.Distance = new Accord.Math.Distances.Chebyshev();
break;
}
var neighbours = Tree.Nearest(query, neighbors: _neighbors);
sw.Stop();
WriteLineColored($"\nThe first {_neighbors} neighbours for {Tree.Count} nodes [{sw.ElapsedMilliseconds} ms]:", ConsoleColor.Cyan);
return(neighbours.OrderBy(n => n.Distance));
}
