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22 lis 2016 · var a = Math.sin(dLat/2) * Math.sin(dLat/2) +. Math.sin(dLon/2) * Math.sin(dLon/2) * Math.cos(lat1) * Math.cos(lat2); var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a)); return earthRadiusKm * c; } Here are some examples of usage: distanceInKmBetweenEarthCoordinates(0,0,0,0) // Distance between same.
Parts of a degree of longitude or latitude can be indicated in decimal form. For example, the UWM campus has latitude 43.08º N and longitude 87.88º W. Alternatively, parts of a degree can be expressed in minutes and seconds. 1 minute = ! 1 60 degree. 1 second = ! 1 60 minute = ! 1 3600 degree.
Straight-Line Distance Calculation. Straight-line distance otherwise known as the crow flies is the simplest way of measuring distance between two destinations. However, this distance can be calculated using different formulas based on a variety of assumptions.
Divide the number of seconds by 60 to obtain decimal minutes (.mm = ss/60) Add the decimal minutes to the minutes (mm.mm = mm + ss/60); Divide the sum by 60 to obtain decimal degrees (.dd = mm.mm/60 = mm/60 + ss/3600); Add the decimal degrees to the degrees [dd.dd = dd + mm.mm/60 = dd + (mm + ss/60)/60 = dd + mm/60 + ss/3600].
Azimuth, Angles, & Bearings. Angles: If one bearing is in the NE and the other is in the SE or (NW and SW), add the two together and subtract the sum from 180°. 180°-(N15°50’25”W+S 20°10’15”W)=143°59’20”. Coordinate Geometry.
When finding the distance between two positions on the Earth's surface, we will use the arc length formula, $l=\frac{\theta}{360^\circ}2\pi r$ l = θ 3 6 0 ° 2 π r, with the angle $\theta$ θ being the angular distance from the centre of the Earth, as we described above.
Pythagorean Theorem to calculate the shortest distance between two points: straight_line_distance = sqrt ( ( x2 - x1 )**2 + ( y2 - y1 )**2 ); The variables x and y refer to co-ordinates in a two-dimensional plane and can reflect any unit of measurement, such as feet or miles.
