You&#x27;ll have green pixels in areas covered by shrubs as well as in areas covered by 40m+ trees intertwined with massive undergrowth.<p>I&#x27;m sure we can count trees from pictures reasonably well, but we can&#x27;t count tree mass that&#x27;s entirely obscured by other objects.<p>To count trees accurately from pictures would require a vast quantity of footage taken from under the canopy.