convertCart2Sph converts arrays of cartesian vectors to spherical coordinates
function (xyz, OMIT_MAG) {
    
    var azi, elev, r;
    var aziElevR = new Array(xyz.length);
    
    for (var i=0; i<xyz.length; i++) {
        azi = Math.atan2( xyz[i][1], xyz[i][0] );
        elev = Math.atan2( xyz[i][2], Math.sqrt(xyz[i][0]*xyz[i][0] + xyz[i][1]*xyz[i][1]) );
        if (OMIT_MAG==1) {
            aziElevR[i] = [azi,elev];
        }
        else {
            r = Math.sqrt(xyz[i][0]*xyz[i][0] + xyz[i][1]*xyz[i][1] + xyz[i][2]*xyz[i][2]);
            aziElevR[i] = [azi,elev,r];
        }
    }
    return aziElevR;
}