Draggable Placemark

Relevant Cesium Source

Relevant Google Earth Source (link)

placemark.setName('Drag Me!');

// listen for mousedown on the window (look specifically for point placemarks)
                    google.earth.addEventListener(ge.getWindow(), 'mousedown', function(event) {
                        if (event.getTarget().getType() == 'KmlPlacemark' &&
                            event.getTarget().getGeometry().getType() == 'KmlPoint') {
                            //event.preventDefault();
                            var placemark = event.getTarget();

dragInfo = {
                                placemark : event.getTarget(),
                                dragged : false
                            };
                        }
                    });

// listen for mousemove on the globe
                    google.earth.addEventListener(ge.getGlobe(), 'mousemove', function(event) {
                        if (dragInfo) {
                            event.preventDefault();
                            var point = dragInfo.placemark.getGeometry();
                            point.setLatitude(event.getLatitude());
                            point.setLongitude(event.getLongitude());
                            dragInfo.dragged = true;
                        }
                    });

// listen for mouseup on the window
                    google.earth.addEventListener(ge.getWindow(), 'mouseup', function(event) {
                        if (dragInfo) {
                            if (dragInfo.dragged) {
                                // if the placemark was dragged, prevent balloons from popping up
                                event.preventDefault();
                            }

dragInfo = null;
                        }
                    });