Cesium Click to obtain longitude and latitude (2D coordinates)

The following code applies to Two dimensional coordinates , Obtain the longitude and latitude coordinates of the ellipsoid surface .

handler = new Cesium.ScreenSpaceEventHandler(viewer.scene.canvas);
handler.setInputAction(event => {
    
  //  Screen coordinates are converted to spatial coordinates 
  let cartesian = viewer.camera.pickEllipsoid(event.position, viewer.scene.globe.ellipsoid);
  if (cartesian == undefined) {
    
    console.log(' No coordinates obtained ')
  } else {
    
    //  Space coordinates to world coordinates ( radian )
    let cartographic = Cesium.Cartographic.fromCartesian(cartesian);
    //  Radian to angle （ Longitude and latitude ）
    let lon = Cesium.Math.toDegrees(cartographic.longitude);  //  Longitude value 
    let lat = Cesium.Math.toDegrees(cartographic.latitude);   //  Latitude value 

    console.log(' Longitude and latitude are ：', {
     x: lon, y: lat });
  }
}, Cesium.ScreenSpaceEventType.LEFT_CLICK)

Cancel the left click event

handler = new Cesium.ScreenSpaceEventHandler(viewer.scene.canvas);
handler.removeInputAction(Cesium.ScreenSpaceEventType.LEFT_CLICK)

Be careful ： pickEllipsoid There is a certain error when loading the terrain , The more concave and convex the terrain is , The greater the error , Therefore, the above aspects can only be used for Two dimensional coordinates Acquisition .

See my other article on 3D coordinates