Application of 3D laser scanning system in mensurating standing volume.;

And then the out-turn percentage of the timber kind is converted to standing volume.

The results show that the estimating equation of standing volume is effective and therefore can be put into practical use.

A Study on Nonlinear Dependently Estimated Tree Volume Model System f or Tibet;

Based on the data of 305 sample trees in 156 standard plots of Eucalyptus plantations in Guangxi,the two-way tree volume dynamic model for Eucalyptus plantations was established by applying modern modeling theory.

Based on the correlation analysis of 370 sample trees between ground diameter（D0）equations for D0 and tree volume were established.

Study on measurement precision of standing tree volume;

nigra,which can provide useful reference for estimating standing tree volume,was worked out.

Then the three-dimensional laser scanning system was used to scan the standing trees and to measure the standing tree volume.

The existing problems to volume estimation in continuous forest inventory(CFI) in China are firstly analyzed in this paper.

All models of seven groups have high precision , the total and the mean relative errors for stand volume estimation are between ±1 % , the mean absolute relative errors are lower than 3%.

The relative tree height curve models of 6 tree species groups in Tibet, that is Fir, Spruce, Cypress, Pine, Oak and other broadleaves, are established by using 554 sample plots of CFI in 2001 in Tibet All models have high precision for volume estimation, and can be used in various kinds of forest inventories in Tibe

Construction of volume tables of Euro-American poplar in Henan Province;

The best and final equations used to construct the overbark ( V d ) and underbark ( V q ) volume tables are V d =3.