Question
Download Solution PDFWhich of the following is TRUE for the limit of accuracy in a compass surveying?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Accuracy
The accuracy of a set of repeated observations is defined as the amount of closeness of their mean to the population or distribution mean, i.e., the closeness of the mean of observations to the true value.
Degree of accuracy
- The degree of accuracy indicates the accuracy attained in the measurements.
- It is usually expressed as the ratio of the error and the associated measured value.
- For example, a degree of accuracy of 1 in 10,000 indicates that there is an error of 1 unit in 10,000 units of measured/observed value.
Note:
For linear measurement:
The degree of accuracy of linear measurement is usually expressed as the ratio of the probable error and the measured distance.
For example, if there is a probable error of ± 0.05 m in a measured distance of 584.65 m, the degree of accuracy is 1 in 11700 as explained below.
For angular measurement:
For angular measurements, the degree of accuracy is usually expressed as k × √N, where N = Number of angles measured
The angular measurement taken in compass surveying has the error should not be more than 5 minutes. Thus, the limit of accuracy is not more than 5 minutes.
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