围尺
wéi chǐ
- 名bamboo ruler for measuring circumference
围尺-
目前，国内外在单株立木直径测量过程中，主要使用的还是需人工读取和记录测量数据的测径围尺或轮尺等树木测量工具。
Presently in standing tree 's diameter measuring process , the main tools are tape meter or caliper , which need manpower to read and record measure data .
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通常采用的传统测量方法，如光学参比法和围尺法，其操作者的劳动强度大，操作危险，测量效率低。
The traditional methods , such as optical reference method , enclosed ruler method , are hard and dangerous to operator , and their measuring efficiency is low .
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通过实验验证，仪器与围尺测量的相对误差在±1%以内，达到了预期设计指标。
The testing result verified the less relative error of this instrument ( within ± 1 % ) compared with tape measures , and the expected design index was fulfilled .