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  ERRORS IN SURVEYING   There is a possibility of the following types of errors creeping into the survey work  (1) Natural error  (2) Instrumental error  (3) Personal error  (1) Natural error   This errors in survey comes in due to bad weather , storm ,heat,rains, scorching sun , moisture, magnetic clash . survey work should be stopped in bad weather. (2) Instrumental error   This error creeps in due to surveying with defective or faulty instruments. The measurements obtained on the field with such instrument would not be trusted. (3) Personal error   The surveyor not being healthy for the survey work ,or his being weak sighted . incorrect identification of the aim , drawing projections incorrectly , carelessness or forgetfulness in noting down measurements not understanding the sign of the assistant correctly, being disinterested in work are some such personal errors which can be avoided by being attentive. Classification errors   (1) C...