Under the same measurement conditions, these errors will have the same magnitude and direction (positive or negative). Systematic errors are caused by the surveying equipment, observation methods, and certain environmental factors. Understand the difference between the two errors in order to minimize them. There are two types of errors, systematic and random. They can also be detected by carefully examining a plot of the collected survey points while in the office. Blunders can be detected and eliminated by reacting to “out-of-tolerance” messages by the data collector when they occur. The surveyor must remain alert and constantly examine measurements to eliminate these mistakes. Transposing numbers or misplacing the decimal point.Īll mistakes must be found and eliminated prior to submitting a survey for inclusion in the project mapping.Incorrectly entering a control point number in the data collector.Setting up the instrument or target over the wrong control point.Improperly leveling the surveying instrument.Blunders are typically the result of carelessness, miscommunication, fatigue, or poor judgment. MistakesĪ blunder (or gross error) is a significant, unpredictable mistake caused by human error that often leads to large discrepancies. Surveyors must possess skill in instrument operation and knowledge of surveying methods to minimize the amount of error in each measurement. The true value of a measurement is determined by taking the mean value of a series of repeated measurements. Errors, by definition, are the difference between a measured value and its true value. Even when carefully following established surveying procedures, observations may still contain errors. These variances are known as errors and will need to be reduced or eliminated to maintain specific survey standards. However, measurements are never exact and there will always be a degree of variance regardless of the survey instrument or method used. A discrepancy is defined as the difference between two or more measured values of the same quantity.
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