Final answer:
The most useful measuring tool for higher elevation measurements from ground level is a clinometer, which measures angles to calculate heights indirectly.
Step-by-step explanation:
When higher elevation measurements need to be taken from ground level, the most useful measuring tool is a clinometer. A clinometer allows you to measure the angle of elevation or depression to an object, from which you can calculate the object's height if the distance to the object is known. Tools like rulers, compasses, and protractors are not suitable for this task since they are designed for other specific measurements. A ruler is typically used for measuring short distances or lengths directly and cannot measure elevations, a compass is used for navigation and determining direction, and a protractor is used for measuring angles on a flat surface.
Therefore, the correct answer among the given options for a tool useful for taking higher elevation measurements is: 3) Clinometer.