32 lines
742 B
Go
32 lines
742 B
Go
package rover
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import (
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"math"
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)
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const (
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m1 = 111132.92 // Latitude calculation term 1
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m2 = -559.82 // Latitude calculation term 2
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m3 = 1.175 // Latitude calculation term 3
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m4 = -0.0023 // Latitude calculation term 4
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p1 = 111412.84 // Longitude calculation term 1
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p2 = -93.5 // Longitude calculation term 2
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p3 = 0.118 // Longitude calculation term 3
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)
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func deg2rad(deg float64) float64 {
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return deg * math.Pi / 180
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}
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func LatitudeLen(deg float64) float64 {
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rad := deg2rad(deg)
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return m1 + (m2 * math.Cos(2*rad)) + (m3 * math.Cos(4*rad)) +
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(m4 * math.Cos(6*rad))
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}
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func LongitudeLen(deg float64) float64 {
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rad := deg2rad(deg)
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return (p1 * math.Cos(rad)) + (p2 * math.Cos(3*rad)) +
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(p3 * math.Cos(5*rad))
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}
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