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Three.js Orbitcontrols calculation for setting camera to rotate upwards for a birds eye view

I cannot seem to figure out the proper way to make my threejs camera, which is initially facing my object, rotate upwards so it's looking down at my object. I grabbed a simple checkerboard example and don't quite understand what's going on. I can fudge the camera rotation with random increasing numbers until I get the top-down view, but I'm trying to understand the proper way to do this.

var scene, camera, renderer, cube, controls, board;

function init() {

  scene = new THREE.Scene();
  camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000);

  renderer = new THREE.WebGLRenderer();
  renderer.setSize(window.innerWidth, window.innerHeight);
  document.body.appendChild(renderer.domElement);

  const square = new THREE.BoxGeometry(1, 0.1, 1);
  const lightsquare = new THREE.MeshBasicMaterial({ color: 0xE0C4A8 });
  const darksquare = new THREE.MeshBasicMaterial({ color: 0x6A4236 });

  board = new THREE.Group();

  let squareNumber = 1;
  for (let x = 0; x < 10; x++) {
    for (let z = 0; z < 10; z++) {
      let cube;
      if (z % 2 == 0) {
        cube = new THREE.Mesh(square, x % 2 == 0 ? lightsquare : darksquare);
        if (x % 2 != 0) {
          cube.userData.squareNumber = squareNumber;
          squareNumber++;
        }
      } else {
        cube = new THREE.Mesh(square, x % 2 == 0 ? darksquare : lightsquare);
        if (x % 2 == 0) {
          cube.userData.squareNumber = squareNumber;
          squareNumber++;
        }
      }

      cube.position.set(x, 0, z);
      board.add(cube);
    }
  }

  scene.add(board);

  camera.position.y = 1;
  camera.position.z = 3;

  controls = new THREE.OrbitControls(camera, renderer.domElement);

  controls.target.set(4.5, 0, 4.5);

  controls.enablePan = false;
  controls.maxPolarAngle = Math.PI / 2;

  controls.enableDamping = true;

  window.requestAnimationFrame(animate);
}

function animate() {
  controls.update();
  renderer.render(scene, camera);
  window.requestAnimationFrame(animate);
}

function onWindowResize() {

  camera.aspect = window.innerWidth / window.innerHeight;
  camera.updateProjectionMatrix();

  renderer.setSize(window.innerWidth, window.innerHeight);

}


window.addEventListener('resize', onWindowResize);

window.onload = init;

<script src="https://threejs.org/build/three.min.js"></script>
<script src="https://threejs.org/examples/js/controls/OrbitControls.js"></script>

The view I'm trying to achieve is this:

about 4 years ago · Juan Pablo Isaza

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Three.js Orbitcontrols calculation for setting camera to rotate upwards for a birds eye view

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