Function cartesian

src/plots/geo/zoom.js:439–448

(spherical)

}

function cartesian(spherical) {
    var lambda = spherical[0] * radians;
    var phi = spherical[1] * radians;
    var cosPhi = Math.cos(phi);
    return [
        cosPhi * Math.cos(lambda),
        cosPhi * Math.sin(lambda),
        Math.sin(phi)
    ];
}

function dot(a, b) {
    var s = 0;