Method and system for measuring three-dimensional green quantity of trees

Abstract

The invention discloses a tree three-dimensional green biomass measurement method which comprises the following steps of: acquiring sampling point information collected by a prism-free full-station instrument in real time by a green biomass calculator; extracting sampling point combination diaphragm layers with same layers, and generating an arc section polygon according to the coordinates of the sampling points in the diaphragm layers; calculating the volume of a tree crown formed by the projection of an arc section polygon of an upper diaphragm layer and an overlapped region of the arc section polygon of a lower diaphragm layer in adjacent diaphragm layers; calculating the volume of a tree crown formed by the projection of an arc section polygon of an upper diaphragm layer and a non-overlapped region of the arc section polygon of a lower diaphragm layer in adjacent diaphragm layers; calculating the total volume of the tree crown, wherein the total volume of the tree crown is the sum of the volume of the tree crown formed by the overlapped region and the volume of the crown formed by the non-overlapped region. The invention also discloses a tree three-dimensional green biomass measuring system. According to the invention, the sampling points collected by the prism-free full-station instrument can be processed in layers; and combined with the arc section polygon, the volume of the tree crown formed by the overlapped region and the volume of the tree crown formed by the non-overlapped region are calculated respectively, and the accuracy is high.

Description

technical field [0001] The invention relates to the field of forest resource monitoring, in particular to a method and system for measuring three-dimensional green quantity of trees. Background technique [0002] Three-dimensional green volume, also known as Living Vegetation Volume (LVV), refers to the volume of space occupied by the stems and leaves of all growing plants. Three-dimensional green quantity reveals the correlation between plant green three-dimensional volume (or leaf area index) and plant ecological function level through the calculation of stem and leaf volume, and then explains the ecological function and environmental benefits of plants themselves, plant communities and even urban forests . As a greening index, the three-dimensional green quantity breaks through the limitations of the original two-dimensional greening index, and can more accurately reflect the rationality of the spatial composition of urban forests, that is, to clarify the differences in ...

AI Technical Summary

Problems solved by technology

However, photogrammetry requires two cameras to take pictures of the trees at the same time. The focal length of the cameras is limited. If the trees are large, it is difficult to measure the whole picture of the trees, and the cost is high

[0008] In general, the existing methods have problems such as heavy workload and low precision.

Therefore, in order to overcome the many troubles that the existing methods inevitably bring during the three-dimensional green quantity measurement of forest standing trees and improve work efficiency, how to introduce new practical green quantity measurement techniques and methods to improve the efficiency of tree measurement , is the key issue of three-dimensional green quantity measurement

Images