A traverse survey is the frame work consists of a series of connected lines, the lengths and directions of which are measured with chain or a tape and with an angular measuring instrument respectively. I. Closed traverse : A traverse is said to be closed when it returns to the starting point forming a closed polygon. E.g. plot II. unclosed or open traverse : A traverse is said to be an open traverse when it does not return to the starting point. E.g.. Road, river, railway METHODS OF TRAVERSING 1. BY THE CHAIN ANGLES: - • Linear measurements are taken • Angles fixed by the lateral measurements are known as chain angles. 2. COMPASS TRAVERSING /FREE NEEDLE/ LOOSE NEEDLE METHOD • Angles are measured by compass and length measured by chain • In this method an angular measuring instrument, is set up at each of the successive stations and the bearing of each line is taken with reference to the magnetic meridian. • In this system the errors are n...
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