Tree diameter estimation Clause Samples

Tree diameter estimation. The tree diameter is estimated from a spatial cluster of its cross-section at some height above terrain. Point cloud cross-section and spatial clusters must be created by the module Cross-section and the Group_by_distance. The tree diameter estimation procedures calculates also diameters from mult i cross- sections of trees. The spatial clusters of tree cross-sections can be interactively visualized, edited and estimated by the Cross-sections analyst. Initial procedures of tree diameter estimation derive position and diameter of a given cross-section from its geometrical properties. The initial methods of diameter estimation include: • the minimum bounding box method (MBB), • the centroid method (CEN), • the maximum distance method (MDS). Initial estimations can be improved by refining methods. The refining methods use optimization algorithms to minimize a root mean square error of circle-fitting residuals. The refining methods of diameter estimation include: • the Monte Carlo method (MC), • the optimal circle method (OC).
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