2results about How to "Overcome volume" 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.

The invention belongs to the technical field of traffic infrastructure underground disease detection, and particularly relates to an underground cavity detection and filling quality safety assessment method based on elastic wave exploration. Comprising the following steps: step 1, arranging elastic wave exploration survey lines along the longitudinal direction and the transverse direction of a target area, simultaneously extracting three feature values of reflection intensity, two-way travel time and instantaneous spectral bandwidth for each voxel to identify a cavity area, dividing injection and filling subareas through three-dimensional connected domain search, and determining a target filling volume of each injection and filling subarea; and 2, after filling media are injected into all the cavity areas, the filling effect is evaluated in combination with settlement monitoring, and a differential inspection management scheme is formulated. According to the invention, cavity refined partition identification based on elastic wave exploration, quantitative evaluation of filling quality and differentiated inspection management of multi-source data fusion are realized.