This Site Customer Feedback Digital Camera Tree Stem Measurement and Evaluation Abstract. The USDA Forest Service, in cooperation with individual states, intensively measures a subset of permanent forest sample plots annually within each geographic region to obtain estimates of tree volume and products. The detailed field measurements required for this type of sampling are both time consuming and error prone. We are attempting to reduce both of these factors with the aid of a commercially available solid-state matrix camera. This device, along with clinometer angle measurements and distance, can be used to rapidly capture data of an entire tree stem.
Subsequent analysis can generate bole heights, diameters, volume, and form measurements.
We have found the diameter measurements taken from digital images to be nearly equal to caliper measurements on felled trees. Volume measurements are much more accurate than using DBH and volume equations. We are developing specifications for both the camera system and data collection protocol. Provided estimates of diameter and volume errors in relation to existing equipment and techniques. Established preliminary measurement protocols and potential sources of error.