经纬仪二倍半丝法视距测量的精度分析

Discussi on about double half-thread reading in measurement of sight lengths by theodolite

笔者针对采用经纬仪二倍半丝读数能否作为视距的问题进行讨论.经过严密的数学推导,得出了采用二倍半丝与采用全丝读数视距差值的数学模型;通过绘制差值的变化曲线和视距测量的精度进行比较,对该问题做出了明确的结论和建议.

The paper discusses whethter the doubled half-thread reading value read from a theodolite can be taken as a sight-length. After strict derivation in math the mathematic model error value of between the doubled half-thread reading and the full-thread reading is achieved; comparing the drawn error value curve with the accuracy of aurveyed sight-length numbers the paper gives clear conclusions and suggestions.