两种测高器的改良使用

对勃鲁莱测高器不改变仪器本身,只改观测高度值为角度值,变换计算公式,即可避免复杂林地阻碍仪器使用的缺陷,可以任选测点测得树高。对克里斯登测高器只作简易变更,用法不变,即可使观测值精度提高100倍,观测值增加231个,且具有校核作用。经检验,两种测高器精度均达98％以上。

The Improvement and Use of Two Kinds of Hypsometers

There are two ways of improving on the Hypsometers. First don't alter the instruments of Blume-lejse hypsometer, just change the height reading to angle reading and vary the formulas, and the hypsometer can be used at the complex forest land just tne same, and we can willfully choose survey point to mensurate the tree height . Second , a little change is made in Christen hypsometer, but the operating way remains unchanged , and the precision of observation value is increased by 100 times, with 231 more observation values obtained. The hypsometer altered in this way has the proofread function. The test shows that both precisions of two hypsometers reach above 98%.