Survey equality of two instrument of measurement set of distance and azimuth (Trupulse360) and sonto Clinometers in measurement of tree height

This research was conducted in order to evaluation of efficiency and accuracy of measured data of height by measurement set of distance and azimuth (Trupulse360) in a Fraxinus stand situated in Chelir part of Kheyroud training and research forest In this study, total height of 155 trees and trunk height without branches in 199 trees were measured through both sonto Clinometers and measurement set of distance and azimuth (Trupulse360). Necessary calculation for total height and height without branches was conducted on data of sonto clinometers. Obtained heights from clinometers and TP360 instruments were entered to SPSS environment and t-test was used for compassion mean of two groups.
Significant levels (P-value) of comparing mean test (t-test) of obtained total height and trunk height without branches through two measurement sets were obtained 0 and 0.026 respectively. Therefore the differences between means of total height in two measurement sets are significant in two levels of 5 and 1 % but the differences between means of trunk without branches are significantly only in 5 percent. The results show that efficiency of TP360 set decrees when the tree have leaves. If the leaves and other visibility obstacle are removed and also this instrument be used in no leaves season, the efficiency will improve.