Introduction of Professional Terminology in Surveying

In our daily vision measurement and image measurement, we often encounter some measurement terms. Today, we collect some professional terms in measurement to introduce them in detail.

1. Measurement: An operation to determine a value.

2. Measured value: the value obtained directly from the measuring instrument or through necessary calculation.

3. Accuracy of measurement: the degree of consistency between the measured results and the agreed true values of the measured values.

4. Repeatability of measurements: Under the following conditions, continuous measurements of the same measurements are made, and the consistency between the measurements is achieved.

Including: the same measurement method; the same observer; the same measurement instrument; the same location; the same conditions of use; repeated in a short time interval.

5. Reproducibility of measurements: Change one or more of the following conditions to continuously measure the same measurements, and the degree of consistency between the measurements.

Including: measurement methods, observers, measuring instruments, location, use conditions, time and so on.

6. Uncertainty of measurement: the evaluation of the range of the measured true value.

7. Absolute error of measurement: the difference between the measured result and the agreed true value of the measured value.

8. Relative error: the ratio of the absolute error of measurement to the true value of measurement.

9. Random error: The component of measurement error that varies unknowingly in the course of multiple measurements of the same measurement.

10. Systematic error: The component of measurement error that remains constant or varies in a predictable manner during multiple measurements of the same measurement.

11. Personnel errors: errors caused by subjective factors and operation techniques of surveyors.

12. Environmental Error: The component of measurement error that can vary with the environment.

13. Method Error: Error caused by imperfect measurement method.

14. Adjustment error: The error caused by the failure to adjust the measuring instrument or object to the correct position or state.

15. Reading errors: errors caused by inaccurate reading of measuring instruments by observers.

Parallax: Errors caused by the observer's deviation from the correct direction of observation in reading or aiming.

17. Estimation error: The error caused by the estimation within the range of the grading value.

18. Gross error: Obviously exceeding the expected error under specified conditions.

19. Measuring force: The measuring pressure exerted by the measuring instrument on the measured surface (position) of the measured part.

20. Measuring Instruments: Instruments that can be used separately or together with other devices to determine geometric quantities.

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