Surveyor's Error in Observing and Plotting

Human error could be introduced during observation and plotting of details through the surveyor. These could be because of

• Objects not being bisected and sighted in sight vanes accurately,
• The centering of the alidade on the desired station point on paper might not be accurate,
• The radiating ray towards the desired object might not be correctly drawn by the referred station point, and
• plotting of details might not be properly completed or recorded.

Care should be exercised during observation procedure to eliminate these categories of errors. Random rechecking of a few details recorded at referred instrument station is desirable.