Cesium limits the size of the zoom / limits the scope of the earth to zoom in and out

Mainly used to control the scope of the earth zoom

// 最小缩放高度（米）
viewer.scene.screenSpaceCameraController.minimumZoomDistance = 200;
// 最大缩放高度（米）
viewer.scene.screenSpaceCameraController.maximumZoomDistance = 100000;