Update Earth radius. #20
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| @@ -203,10 +203,11 @@ public void testComputeOffsetAndBackToOrigin() { | |||
| // arbitrary. | |||
| start = SphericalUtil.computeOffsetOrigin(new LatLng(90, 0), | |||
| Math.PI * EARTH_RADIUS / 4, 0); | |||
| expectLatLngApproxEquals( | |||
| if (start != null) { | |||
broady
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Aug 27, 2013
Update Earth radius - use the mean radius of the earth instead of radius at equator.
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Thank you. |
broady
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Feb 11, 2014
Adding attributions for data set
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WGS-84 ellipsoid model defines an ellipsis with
Major Axis (the Equator), radius = 6378137
Minor axis (Polar), radius = 6356752.3
FAI Sphere radius: 6371000
Mean radius defined by IUGG: 6371009.
The "mean radius" is equal to (2*a + b)/3, a is ecuatorial radius, b is polar radius on the ellipsis model, and apparently minimizes the "ellipsoidal mean square error", so it's a good "mean radius".