10-meter wind speed
n. Wind speed ten meters (33 feet) above the surrounding vegetation.
In most of the world, the standard height above the surrounding vegetation for measuring open wind speed is ten meters (33 feet); in the United States, it is measured 20 feet above the surrounding vegetation (20-ft wind speed). Multiply 20-foot wind speed by 1.15 to estimate 10-meter wind speed; alternately, divide 10-meter wind speed by 1.15 to estimate 20-foot wind speed (Turner and Lawson 1978).
In forested stands, ten-meter wind speed is measured ten meters above the top of the tree canopy; in shrublands, it is measured ten meters above the top of the shrub vegetation.