Laser Technology’s Criterion RD 1000 is the first electronic BAF-scope and dendrometer that is capable of visually determining if trees fall in or out of a given plot as related to a specified Basal Area Factor (BAF). It also internally computes the limiting distance for questionable, borderline trees and determines if they are in or out of the plot. It measures the diameter of a tree at any given height and provides the ability to determine the height at which a specific diameter occurs.  This video demonstrates how to timber cruise and determine if trees are in or out of a sample plot and how to measure a diameter of a tree.

However, they needed to capture the vertical datum in NAVD88. This explains the differences between Height Above Ellipsoid captured by Mobile GIS apps and how to convert that elevation data to MSL (NAVD88).

This article breaks down the explanation of how RTK and NTRIP work to get field users centimeter level accuracy in real-time.