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radios
2012 Sep 02
1
why variations in accuracy between R to ARCGIS for the same point reprojection?
...+ellps=WGS84"))
If I put the two outputs of the reprojections in the same map, they
are off by few meters in the tropics by up to 40km in the poles.
I decided to investigate how the reprojections are done and my
calculations are different from both R and ArcGis:
First, I calculated the radious of the Earth in two different ways:
=Re * (1 - e^2)/ (1 - e^2 *SIN(RADIANS(Latitude))^2)^(3/2)
=Re * SQRT(1 - e^2) / (1 - e^2 * (SIN(RADIANS(Latitude)))^2)
where Re is the radius of the Earth at the tropics(6378km) and e is
the eccentricity of the ellipsoid (0.081082).
According to several book...