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第六章 小地区控制测量 PowerPoint PPT Presentation


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第六章 小地区控制测量. 控制测量概述. . 导线测量. . 角度前方交会法. . . 三角高程测量. §6.1 控制测量概述. 一、为什么要做控制测量?. 普通测量的任务: 测绘地形图、施工放样. 可控制全局 减少误差积累 可分组进行作业. 例如测图这样的工作,如果从一个点开始,逐步依据前一个点测定后一个点的位置,必然会将前一个点的误差带到后一个点上。这样测量误差逐步积累,最终导致测量成果不能满足要求。. 所以 测量工作必须遵循 “从整体到局部”、“先控制后碎部” 的原则来组织实施。. 二、 什么是控制测量?.

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第六章 小地区控制测量

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