Tacheometry

Tacheometry

Tacheometry is a distance-measuring procedure that involves using the relationship between the angle subtended by a short base distance perpendicular to the bisector of the line and the length of the bisecting line. It can be done by measuring intervals between cross hairs on a rod or angles subtended between marks on a bar of known length, or a similar indirect method. The stadia system tacheometry specifically makes use of stadia line measurement together with a staff held in the vertical position.From: The Civil Engineering Handbook [2019], The Engineering Handbook [2018], Roadwork [2019]

Maps, drawings and surveying

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Purchase Book

Published in Malcolm Copson, Peter Kendrick, Steve Beresford, Roadwork, 2019

Malcolm Copson, Peter Kendrick, Steve Beresford

A tacheometer survey may be undertaken using one of several different techniques but the usual method is that described below. This requires a theodolite, having a measuring device inside it and hence sometimes referred to as a tacheometer, together with a normal graduated staff. By measuring distances in this manner, the chaining operation is eliminated and hence distances may be measured over broken ground or standing crops.

Geodetic Methods for Documenting and Modelling Cultural Heritage Objects

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Journal Information

Published in International Journal of Architectural Heritage, 2021

Dušan Petrovič, Dejan Grigillo, Mojca Kosmatin Fras, Tilen Urbančič, Klemen Kozmus Trajkovski

The main advantages of tacheometry are high precision of measurements and the possibility of surveying individual points, which is especially useful for the production of wireframes (significant objects and contour lines). The method is indispensable for indoor and underground surveys, as well as for the georeferencing of data using various technologies, e.g., terrestrial laser scanning, UAV and terrestrial photogrammetry. The main limitation is, however, need for the direct visibility between the standpoint and the measured point.

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Maps, drawings and surveying

Geodetic Methods for Documenting and Modelling Cultural Heritage Objects