cesium图标贴地

  viewer.entities.add({
                position: positions[0],
                name:"measurePolyline",
                billboard: {
                    image: "./MyJS/CesiumTools/img/start.png",
                    verticalOrigin: VerticalOrigin.BOTTOM,//贴地属性
                },
                point: {
                    pixelSize: 5,
                    color: Color.RED,
                    outlineColor: Color.WHITE,
                    outlineWidth: 2,
                },
            });

效果：