geo

Documentation

Index

• Variables
• func Bearings(pLat, pLng, qLat, qLng float64) (float64, float64)
• func Haversine(xLat, xLon, yLat, yLon float64) float64
• func HaversineInMeters(xLat, xLon, yLat, yLon float64) float64
• func IsInPath(...) bool

Variables

var PreComputedExtraAngles map[int]float64 = map[int]float64{
	100: 120.0,
	75:  88.0,
	50:  56.0,
	25:  28.0,
	20:  22.0,
	10:  12.0,
	0:   180.0,
}

Precalculated angles to speed up the process. This is to build the base of the cone based on how much further do we allow the the geo asset at its current position to go beyond its destination to reach the via point

Functions

func Bearings

func Bearings(pLat, pLng, qLat, qLng float64) (float64, float64)

Bearing calculates the initial and final angles (in degrees) taken on the route (P, Q) using Great Circle navigation. All latitudes and longitudes are expected to be in degrees. The current method is most suitable for short distances.

func Haversine

func Haversine(xLat, xLon, yLat, yLon float64) float64

Haversine uses the haversine formula to return a great-circle distance between two latitude/longitude points. Distance returned is in kilometers.

func HaversineInMeters

func HaversineInMeters(xLat, xLon, yLat, yLon float64) float64

Returns the distance between two points (given by lat and long coordinates) in meters

func IsInPath

func IsInPath(currentLat, currentLng, destinationLat, destinationLng, viaLat, viaLng, extraDestinationAngle, coneAngle float64) bool

isInPath determines whether the location via which we are going through is in the cone formed by the current position and the destination