In former days,the sample trees were felled by the same tools,were measured by the same sectional measurement method,then the wood volumes were calculated.To change the status quo,combining photoelectric theodolite and computer and using special programming development software system technology,a set tree measuring system was formed,which gave a full play to the angle measurement function of photoelectric theodolite with high precision,organized workers to take the ground diameter and the diameter at breast height,then employed specialized software for the trunk diameter at breast height,tree height,anywhere in diameter,and finally calculated the surface area and volume of the volume and crown.The statistical analysis on 99 trees 107-Yang show that the binary volume variances of photoelectric theodolite precise measurement variance were σmax=0.130 3,σmin=0.001 3; the distributions of every set of variables were concentrated,the degree of dispersion was in a lesser extent,meantime the small Cv value was less than normal,and the numbers of the positive skewed was equivalent to that of negative skewed,all these confirmed the obtained data have good stability,are worthy of trust.
NETL
NSTL
万方数据
维普
