Method for measuring crown volume based on elevation isoline method

Abstract

The invention discloses a method for measuring crown volume based on an elevation isoline method. In the method, under the condition of not hewing down standing trees, three-dimensional space coordinates of a crown is obtained through a prism-free laser overall meter so as to draw contour lines of the crown, and a digital elevation model of the crown is established by using the counter lines, andthen the volume of the crown is calculated; therefore, work efficiency is greatly improved, labor intensity is reduced, and particularly, serious damage to forests due to the fact that section diameters are obtained and distinguished by hewing down a great amount of trees during the traditional tree volume measurement process can be avoided. The method has a broad market prospect.

Description

technical field [0001] The invention relates to a method for calculating the crown volume, in particular to a method for measuring the volume of the crown based on an elevation contour method for accurately measuring the volume of standing trees when they are not felled. technical background [0002] Tree canopy volume is a must-measure item in forestry survey planning. It is an important parameter for detecting tree growth, predicting tree biomass, and reflecting forest productivity. It is an important basic data for digital gardens. Therefore, it has always been a hot spot in forestry research. For many years, when calculating the volume of trees in forestry, the traditional method is mostly adopted, that is, a large number of standing trees are cut down as sample trees, and the volume is calculated by using the felled wood division to calculate the volume; this method causes great damage to the forest; in practice Using standing tree equal length division quadrature metho...

AI Technical Summary

Problems solved by technology

For many years, when calculating the volume of trees in forestry, the traditional method is mostly adopted, that is, a large number of standing trees are cut down as sample trees, and the volume is calculated by using the felled wood division to calculate the volume; this method causes great damage to the forest; in practice Using standing tree equal length division quadrature method, cumulative height method and other standing tree division quadrature method and height method to measure the volume of standing trees, although the damage to the forest is avoided, but it is limited by the limitations of the measuring instrument environment and accuracy, and the workload is very large. It is not conducive to the establishment of the green quantity database and the unification of data storage, management and application. "A method for measuring the crown volume based on the elevation contour method" avoids the prism laser total station measuring the surface coordinates of the crown and measuring the crown volume. 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, avoiding the disadvantages of large relative errors caused by the use of artificial tape measure due to the large height of urban greening plants

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