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thread159-315400: what's chainage in road survey?!!!

I came across this (above) thread and feel it's my duty to correct some misunderstandings throughout it.

Chainage is a linear distance measurement used for linear transportation infrastructure. Chainage can be either slope distance or horizontal distance. Generally, this is dependent on what stage of the project the chainage is referring to.

At construction planning phase, chainage will be horizontal as it corresponds to legal drawings and ROWs which are defined in 2D.

The surveyor will then relate the plan to real world, which will allow topographic (3D) information for better planning of material QTO, safety related design work, etc.

As-built chainage is the slope distance. For a road, the as-built chainage does actually represent the length of the road.
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RE: Chainage

I thought that it may have been to the use of engineers' and surveyors' chains that were used in older time by surveyors. My old textbook "Surveying", 4 th Ed. by Davis and Foote describes these chains but does not use the term chainage.

RE: Chainage

Chainage is the historical term for Stationing. The two are the same but stations were used at hundred foot increments where a monument (nail, post, etc) would have been placed and used for surveying.

You're correct it is a result of using Gunther's chain. And the term "-age" is added to this unit of measurement to signify it as a rate/accumulation.

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