Measuring on the job

There were three Aggies; one crane operator, one pole climber, one guide. The guide tied the crane to the end of a pole. The crane operator would then pick the pole up on end. The climber climbed to the top and dropped a tape measure which the guide promptly read and noted the measurement. The crane operator then lowered the pole to the ground and repsitioned to pick up another pole. This went on several times when the foreman came over and asked why they couldn't measure the poles while they were laying on the ground? The Aggies replied, "we need to know how tall the poles are, not how long".