Two observers are located at points $C$ and $D$, which are $3\text{ km}$ apart, along a straight line. They simultaneously measure the angle of elevation of a drone flying above the line segment $CD$. Observer $C$ measures an angle of elevation to be ${30}^{\circ }$, while observer $D$ measures an angle of elevation to be ${60}^{\circ }$. Assuming that the drone is directly above the line segment between $C$ and $D$, what will be the height of the drone located above the ground?