Analysis of Geodetical Measurements' Accuracy for Forest Block Network in Tytuvėnai State Forest Enterprise

This article presents the analysis of state forest block network geodetical measurement accuracy. Geodetic measurement network is compared to the pre-formed block network, which is registered in the State Forestry cadaster. Preliminarily shaped forest block network lines are geodetically measured with analogous points X and Y, and then the coordinates were adjusted to blocks at intersection points. The axial line of objects was determined by estimating the linear object design width with accuracy of no less than 0.25 m and marked its middle. The coordinates of points determined at least 0.3 m accuracy at the outer limit of the forest and 0.5 m inside. Accuracy of measurements is calculated as "X" and "Y" coordinate difference between geodetically measured network points and same points in a pre-formed block network. The study used as a basic georeferenced cadastral data set GDB10LT, in which all static ground natural and anthropogenic objects are registered. Study was performed in Tytuvėnai State Forest Enterprise. Results showed, that intersection of forest block network lines in "X" axes was ± 2.62 m, and in "Y" axes ± 2.9m. Average distance between measured and pre-formed block points - ± 4.39 m. The difference between pre-formed block network line intersection and the geodetic measured block network line intersection varies from 0.00 m and 12.04 m.