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A local reference height set for one job.
Also known as: TBM marking, Site datum marking
A temporary benchmark is a mark established on site for the duration of a job, its height transferred from a permanent one and used as the local reference for all levels on that work.
Provides a local height reference for the duration of one job, transferred from a permanent mark.
Contexts: Maps
Carries the accumulated error of the transfer, so every level on a site is only as good as the chain of measurements back to a permanent mark.
Contexts: Maps
A painted cross, a cut line or a bolted plate on a stable feature on site, labelled with its transferred height.