ERRORS THAT OCCUR IN CHAIN SURVEYING
An error is a mistake or shortcoming that happens during the survey process leading to wrong measurements. It is sometimes called discrepancies . The following are the type of errors or discrepancies in chain surveying. Sources of Errors in Chain Survey and Their Correction The errors can be divided into three groups: Cumulative (systematic) errors Compensating (accidental) errors Gross Errors Cumulative Errors: Cumulative errors are said to be systematic errors as they are one-directional hence keep on accumulating as the survey progresses. If not checked they have serious implications to the accuracy of the survey. Errors in this class include incorrect length of the tape, page of the tape or the tape not being in line. Since the sources of these errors are known, they can be eliminated. They can either be positive or negative errors. While positive errors shortens the measurement (e.g. where the tape length is shorter than what it should be) while negative errors elongates th...