3 results about "Standing tree" patented technology

This invention discloses a method for determining the volume of a single standing tree based on a backpack-mounted lidar, belonging to the field of forestry surveying and remote sensing technology. During system operation, the three-dimensional point cloud acquired by the backpack-mounted lidar is preprocessed, a unified coordinate system is established, and non-terrestrial point clouds are extracted. Individual tree segmentation is achieved by combining density peak clustering and vertical profile connectivity analysis, obtaining individual tree point cloud clusters. Equally spaced evaluation layers are divided along the tree height direction, and the effective point density, azimuth coverage, and normal vector consistency of each layer are calculated to determine the data reliability level. A high-reliability layer is selected, and weighted least squares circle fitting is used to obtain the center and radius of the cross-section, which are then used as observation constraints. Typical trunk tapers of the same tree species and age group are introduced as morphological priors. The optimal parameterized surface model is solved through Bayesian inference, and finally, the volume of a single standing tree is calculated by integrating the Huber formula.

This application relates to the fields of micro-destructive testing of living trees and wood performance testing, and particularly to a micro-destructive sampling method for living trees and a rapid prediction method for wood performance. The micro-destructive sampling method for living trees includes: selecting a defect-free, healthy trunk area at a first preset height above the ground of the living tree as the sampling area; peeling off the bark of the sampling area using a woodworking chisel and marking the sampling area to obtain a marked area; cutting along the boundary of the marked area to a preset depth to form a rectangular window-shaped cutting slit of preset length × preset width, cooling the area by spraying distilled water during the cutting process; prying open a notch on the side of the rectangular window to obtain a cuboid wood block containing several complete growth rings from the bark inwards; placing the removed cuboid wood block into a sealed bag, adding distilled water to the sealed bag to keep the surface of the wood block moist, sealing it, and storing it in an environment within a preset temperature range.

The present application relates to a kind of wood mechanical property prediction method, system, equipment and medium based on live standing tree stress wave data, wherein, method includes: obtaining live standing tree longitudinal wave velocity data, green density, live standing tree moisture content, forest tree germplasm and tree age;Live standing tree longitudinal wave velocity data is screened based on wave velocity gradient mutation response trigger knot defect, and moisture content is combined to implement correction, output standard longitudinal wave velocity data, and boundary effect compensation is executed, generates log equivalent wave velocity, gradient correction is carried out in combination with the radial spatial distribution relationship of detection node and pith, and output corrected wave velocity parameter;Through the coupling of multiple sources, dynamic elastic modulus prediction model is constructed, and dynamic elastic modulus is predicted and output, and is converted into static reference modulus, conditionally introduces tree age attenuation factor to exert correction, and obtains final static elastic modulus.The present application significantly improves the precision and applicability of live standing tree mechanical property prediction by coupling analysis and dynamic correction mechanism of multiple source stress wave data.