树径，树径按测量基准点不同，分为四种形式；胸径是指距地面往上1.3米处的树干直径；米径是指距地面往上1.0米处的树干直径；地径是指距地面往上0.1米处的树干直径；基径是指距地面根颈处的树干直径
... restricted and unrestricted random walk : 限制与非限制随机走动[游动] walk : 游动；步行，走；步测 tree-walk : 树径 ...
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该方法可以同时对树木的树高、树径、树冠进行测量。
It can measure the height, diameter and crown of trees at the same time.
定高树径测量仪是基于单片机、超声波测距、条形码识别等多种技术而开发研制的在树木确定高度情况下进行测量树木直径的一种新型测量仪器。
Trees s fixed high diameter meter is a new kind measuring instrument, which bases on many kinds of technologies such as the one-chip computer, ultrasonic and bar code discerning.
到达目标后，在圈定好的500米区域内，他们用卷尺，测径规和手持激光设备对所有树木的高度和树围进行测量。
Once there, they use tape measures, callipers and a hand-held laser to measure the heights and girths of all the trees within a 500-square-metre plot.
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