Tree volume measuring method based on digital elevation model

Abstract

The invention discloses a tree volume measuring method based on a digital elevation model. According to the method, in the condition of not cutting down a standing tree, the tree is scanned through a three-dimensional laser scanning system, standing tree three-dimensional space lattice data is obtained, thus a three-dimensional space model of the standing tree is established, the volume of the tree is calculated by utilizing an earthwork calculation function of a digital ground model method of a digitized mapping data acquisition system, working efficiency is raised greatly, labor intensity is reduced, especially a phenomenon that in a traditional tree volume measuring process, a large number of trees are needed to be cut down to obtain and distinguish a section diameter, and great damage is caused to a forest is avoided , and the method has a broad market prospect.

Description

technical field [0001] The present invention relates to a method for calculating three-dimensional green quantity, in particular to accurately measuring the volume of standing trees when they are not felled, using a tree volume measurement method based on a digital elevation model. technical background [0002] The premise of three-dimensional green volume research is to measure the three-dimensional volume of trees. For many years, when calculating the volume of trees in forestry, most of them adopt traditional methods, that is, cut down a large number of standing trees as sample trees, and use the felled trees to distinguish the quadrature formula Calculate the volume; this method has caused great damage to the forest; in practice, the standing tree division quadrature method such as the standing tree length division method, the cumulative height method and the height-seeking method are used to measure the volume of the standing wood, although the damage to the forest has b...

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Problems solved by technology

[0002] The premise of three-dimensional green quantity research is to measure the three-dimensional volume of trees. For many years, when calculating the volume of trees in forestry, most of them use traditional methods, that is, cut down a large number of standing trees as sample trees, and use the felled trees to distinguish the quadrature formula Calculate the volume; this method causes great damage to the forest; in practice, the standing tree division quadrature method, cumulative height method, etc. are used to measure the volume of standing trees, although the damage to the forest has been avoided. However, it is limited by the environment and accuracy of the measuring instruments, and the workload is very large, which is not conducive to the establishment of the green quantity database and the unification of data storage, management and application. "A method of tree volume measurement based on digital elevation model" uses a computer The simulation calculation of the method replaces the complex manual three-dimensional measurement. At the same time, the volume calculated by this method can be more than 10 times more accurate than the volume calculated by the conventional volume method, which avoids the relatively large relative error of using an artificial tape measure due to the large height of urban greening plants. ills

The traditional standing volume calculation either needs to cut down a large number of trees, causing great damage to the forest; or requires a large number of manpower to measure and calculate, and the accuracy cannot meet the requirements of accurate forestry measurement. Today, the ecological environment is increasingly valued and attention is paid to accuracy and speed. , these two methods have disadvantages