SinusoidalProjection returns the incorrect results
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Key: LUCENE-2519
URL: https://issues.apache.org/jira/browse/LUCENE-2519
Project: Lucene - Java
Issue Type: Bug
Components: contrib/spatial
Reporter: Grant Ingersoll
Currently, the SinusoidalProjection does:
{code}
public double[] coords(double latitude, double longitude) {
double rlat = Math.toRadians(latitude);
double rlong = Math.toRadians(longitude);
double nlat = rlong * Math.cos(rlat);
return new double[]{nlat, rlong};
}
{code}
But the correct formula (from
http://en.wikipedia.org/wiki/Sinusoidal_projection) is:
{quote}
x = (gamma - gamma[0]) cos(phi)
y = phi
{quote}
where gamma[0] is assumed to be the prime meridian in this case (0), gamma is
the incoming longitude and phi is the latitude
Thus, the above code should return:
{quote}
{nlat, rlat}
{quote}
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