三等水準(zhǔn)測(cè)量中對(duì)測(cè)站限差要求有哪些?
(1)三等水準(zhǔn)測(cè)量前、后視距不超過 75m;
( 2)前后視距不等差不超過 2m;
( 3)前后視距不等差累計(jì)值不超過 5m;
( 4)同一根尺黑紅面讀數(shù)差( K+黑-紅)不超過 2mm;
( 5)同一站黑紅面所測(cè)高差之差不超過 3mm;
( 6)視線離地面高度應(yīng)超過 0.3m。
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