【Cesium基础】从3dtiles 采高度，已知根据经纬度点集

sampleHeightMostDetailed

 * Initiates an asynchronous  query for an array of positions using the maximum level of detail for 3D Tilesets in the scene. The height of the input positions is ignored.Returns a promise that is resolved when the query completes. Each point height is modified in place.

使用场景中3D Tilesets的最大细节级别启动对位置数组的异步查询。输入位置的高度被忽略。返回查询完成时解析的promise,每个点的高度都被就地修改。

If a height cannot be determined because no geometry can be sampled at that location, or another error occurs, the height is set to undefined.

 * @example
 * const positions = [
 *     new Cesium.Cartographic(-1.31968, 0.69887),
 *     new Cesium.Cartographic(-1.10489, 0.83923)
 * ];
 * const promise = viewer.scene.sampleHeightMostDetailed(positions);
 * promise.then(function(updatedPosition) {
 *     // positions[0].height and positions[1].height have been updated.
 *     // updatedPositions is just a reference to positions.
 * }

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Scene.prototype.sampleHeightMostDetailed = function (
  positions,
  objectsToExclude,
  width
) {
  return this._picking.sampleHeightMostDetailed(
    this,
    positions,
    objectsToExclude,
    width
  );
};

 实验案例

        const positions = [new Cesium.Cartographic.fromDegrees(longitude, latitude),
        new Cesium.Cartographic.fromDegrees(longitude, latitude + 0.0001) ];
            const promise = scene.sampleHeightMostDetailed(positions);
            promise.then(function(updatedPositions) {
               positions[0].height = updatedPositions[0].height;
               console.log('Height at point:', height);
          });