Published in Scientific Papers. Series "Journal of Young Scientist", Vol. 3
Written by Claudia PRAJANU
The paper aims to identify and analyse factors that affect the precision of determination in the horizontal plane of points, located within a larger forest area in Brasov county.For this purpose 2704 point where measured using a GPS equipment. The precision of such measurements is affected by a series of factors like the forest canopy and the terrain orography. The coordinates of the points were obtained using the semi-kinematic method, Stop&Go with postprocessing, which has an average precision, acceptable in this field. The points were then grouped according to the following criteria: localization, forest formation, orography, exhibition (S-N, E-V), forest consistency (<0.7, 0.7-0.8, 0.9-1.0), tree age (21-40 years, 41-60 years, 61-80 years, 81-100 years, >100 years).The points have been processed using software AutoCAD Map 3D and specific modules of ArcGIS. Data have been processed using a statistical program, Statistica 8.0. The distributions were analysed using several statistical indicators (maximum, minimum, mean, standard error of mean, mode, frequency of mode, standard deviation, coefficient of variation).Accuracies obtained were analyzed both for each category as well as for combinations of 2, 3 and 4 factors.After analysing all the results obtained, it can be expressed the idea that, on the whole, the accuracy of determining the point coordinates in forest lands is relatively good and that there are rare cases where exaggerated values are obtained.
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