Grid meridian

Sometimes, for preparing a map some state agencies assume several lines parallel to the true meridian for a particular zone. These lines are termed as ’grid lines’ and the central line the ‘grid meridian. Technical Data used in the field explained in civil surveyor course in rawalpindi .the hearing of a line with respect to the grid meridian is known as the ‘grid bearing’ of the line.

Magnetic bearings are designated by two systems, whole circle bearing ,quadrantal bearing. The magnetic bearing of a line measured clockwise from the north pole towards the line, is known as the ‘whole circle bearing, of that line. Such a bearing may have any value between 0 degree and 360 degree. The whole circle bearing of a line is obtained by prismatic compass. Some more details of civil surveyor course in rawalpindi are as under. The magnetic bearing of a line measured clockwise or counterclockwise from the north pole or south pole ,whichever is nearer the line, towards the East or West ,is known the’ quadrantal bearing of the line. This system consists of four quadrants.

NE,SE,SW and NW. the value of a quadrantal bearing lies between 0 degree and 90 degree, but the quadrants should always be mentioned. quadrantal bearings are obtained by the surveyor’s compass. For example, QB of AB=NØ1E,QB of AC=SØ2E,QB of AD=SØ3W,QB of AE=NØ4. When the whole circle bearing of a line is converted to quadrantal bearing, it is termed the ‘reduced bearing’. TSK Training for Skills and Knowledge is the best institute in Rawalpindi Islamabad for Pakistani Students who wants to join civil surveyor course in islamabad.

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