public static double ConvertDistanceToMeters(DistanceMeasurementType _fromType,
double _fromValue)
{
double multiplier = 1.0;
switch (_fromType)
{
case DistanceMeasurementType.Feet:
{
multiplier = .3048;
break;
}
case DistanceMeasurementType.Kilometer:
{
multiplier = 1000.0;
break;
}
case DistanceMeasurementType.Mile:
{
multiplier = 1609.344;
break;
}
case DistanceMeasurementType.Meter:
default:
{
multiplier = 1.0;
break;
}
}
return multiplier*_fromValue;
}
public static double ConvertDistanceFromMeters(DistanceMeasurementType _toType,
double _fromValue)
{
double multiplier = 1.0;
switch (_toType)
{
case DistanceMeasurementType.Feet:
{
multiplier = 3.2808399;
break;
}
case DistanceMeasurementType.Kilometer:
{
multiplier = .001;
break;
}
case DistanceMeasurementType.Mile:
{
multiplier = .000621371192;
break;
}
case DistanceMeasurementType.Meter:
default:
{
multiplier = 1.0;
break;
}
}
return multiplier*_fromValue;
}
public static double ConvertDistance(DistanceMeasurementType _fromType,
DistanceMeasurementType _toType, double _fromValue)
{
if (_fromType == _toType)
{
return _fromValue;
}
double meterValue = ConvertDistanceToMeters(_fromType, _fromValue);
return ConvertDistanceFromMeters(_toType, meterValue);
}
/// <summary>
/// Calculate distance.
/// </summary>
/// <param name="longitude1">The longitude1.</param>
/// <param name="latitude1">The latitude1.</param>
/// <param name="longitude2">The longitude2.</param>
/// <param name="latitude2">The latitude2.</param>
/// <param name="measurement">The measurement.</param>
public static double Distance(
double longitude1,
double latitude1,
double longitude2,
double latitude2,
DistanceMeasurementType measurement = DistanceMeasurementType.Kilometers)
{
double diff = longitude1 - longitude2;
double distance = (System.Math.Sin(MathHelper.DegreesToRadians(latitude1)) * System.Math.Sin(MathHelper.DegreesToRadians(latitude2))) +
(System.Math.Cos(MathHelper.DegreesToRadians(latitude1)) * System.Math.Cos(MathHelper.DegreesToRadians(latitude2)) * System.Math.Cos(MathHelper.DegreesToRadians(diff)));
distance = System.Math.Acos(distance);
distance = MathHelper.RadiansToDegrees(distance);
distance = distance * 60 * 1.1515;
switch (measurement)
{
case DistanceMeasurementType.Meters:
distance = distance * 1.609344 * 1000;
break;
case DistanceMeasurementType.Feet:
distance = distance * 1.609344 * 1000 * 3.2808399;
break;
case DistanceMeasurementType.Kilometers:
distance *= 1.609344;
break;
case DistanceMeasurementType.StatuteMiles:
// default
break;
case DistanceMeasurementType.NauticalMiles:
distance *= 0.8684;
break;
default:
throw new SwitchCaseDefaultException(measurement);
}
return(distance);
}
/// <summary>
/// Calculate distance.
/// </summary>
/// <param name="coordinate1">The coordinate1.</param>
/// <param name="coordinate2">The coordinate2.</param>
/// <param name="measurement">The measurement.</param>
public static double Distance(
CartesianCoordinate coordinate1,
CartesianCoordinate coordinate2,
DistanceMeasurementType measurement) =>
Distance(coordinate1.Longitude, coordinate1.Latitude, coordinate2.Longitude, coordinate2.Latitude, measurement);
public void Distance(double expected, double latitude1, double longitude1, double latitude2, double longitude2, DistanceMeasurementType measurement)
{
// Act
var actual = GeoSpatialHelper.Distance(latitude1, longitude1, latitude2, longitude2, measurement);
// Assert
Assert.Equal(expected, actual);
}
public void Distance_CartesianCoordinate(double expected, double latitude1, double longitude1, double latitude2, double longitude2, DistanceMeasurementType measurement)
{
// Arrange
var coordinate1 = new CartesianCoordinate(latitude1, longitude1);
var coordinate2 = new CartesianCoordinate(latitude2, longitude2);
// Act
var actual = GeoSpatialHelper.Distance(coordinate1, coordinate2, measurement);
// Assert
Assert.Equal(expected, actual);
}
