Resection

This method is just opposite method of intersection. In the method, the plotted position of stations is known and by intersection the plotted position of objects is obtained. In this method the plotted position of objects are known and the plotted position of station is get. If a, b and c are the plotted respectively positions of objects A, B and C, to locate instrument station P on the paper, the orientation of table is achieved through the help of a, b, c and then resectors Aa, Bb, Cc are drawn to obtain 'p' , the plotted position of P. therefore in the resection method chief work is to ensure suitable orientation by any one of the methods. In the method of resection the following methods are employed:

1. by back sighting
2. by compass
3. by solving three point problem.
4. by solving two point problem