public static SqlDouble fHtmIDToSquareArcmin(SqlInt64 hid)
{
HtmTrixel htm = new HtmTrixel();
double t1, t2, t3;
double area;
if (htm.getAngles((Int64)hid, out t1, out t2, out t3))
{
// Area in stearadians A = R^2[(t1 + t2 + t3 ) - Pi], but R=1.
area = (t1 + t2 + t3) - Cartesian.Pi;
area *= Cartesian.RTOD * Cartesian.RTOD; // to get square degrees;
area *= 3600.0; // square arc minutes
}
else
{
area = 0.0;
}
return (area);
}
