Difference between revisions of "Height of the instrument (HI)"

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1. In surveying, the sum of the [[benchmark]] elevation and a rod reading at the benchmark, from which all subsequent readings are subtracted to establish elevations. The benchmark elevation may be established from older surveys, or may be arbitrarily assigned to provide a consistent basis for comparison.<br><br>
 
1. In surveying, the sum of the [[benchmark]] elevation and a rod reading at the benchmark, from which all subsequent readings are subtracted to establish elevations. The benchmark elevation may be established from older surveys, or may be arbitrarily assigned to provide a consistent basis for comparison.<br><br>
http://www.ci.salem.va.us/depts/engineering/images/tools3.jpg<br><br>
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http://surveying.structural-analyser.com/_internal/images/Book_constrSurv_00159_642x450.jpg<br><br>
Here is a surveyor's tool which will be used to determine the height of the instrument by adding the [[benchmark]] elevation and a [[rod reading]] at the benchmark.<br>
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Assuming the height of the instrument is known, elevation is set by means of level instrument.<br>
Source: http://www.ci.salem.va.us/depts/engineering/
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Source: http://surveying.structural-analyser.com/chapter10/<br><br>

Latest revision as of 18:54, 5 October 2017


1. In surveying, the sum of the benchmark elevation and a rod reading at the benchmark, from which all subsequent readings are subtracted to establish elevations. The benchmark elevation may be established from older surveys, or may be arbitrarily assigned to provide a consistent basis for comparison.

Book_constrSurv_00159_642x450.jpg

Assuming the height of the instrument is known, elevation is set by means of level instrument.
Source: http://surveying.structural-analyser.com/chapter10/