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Land Surveyor's Dictionary is an ongoing community project to crowdsource surveying definitions and terms with examples for the next generation land surveyor to learn from. If you are a Land Surveyor, add a term to the Almanac with its definition and examples. Help improve the collective knowledge of the community by improving upon terms added by other surveyors by commenting with your examples and applications in your local surveying environment.
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Double Rodding

Double Rodding

Double rodding is a form of differential leveling in which a continuous check is maintained on the accuracy of the leveling procedure. It is called double rodding because it can be done most conveniently by two rodmen. However, it is possible to carry out the procedure using only one rodman.

In double rodding, you determine the HI at each setup point by backlights taken on two different TPs. If no mistake or large error hasbeen made, the result will be two HIs that differ slightly from each other. Elevations computed this way will also differ slightly. In each case, the average is taken as the elevation.

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