SURVEYING IS THE WORD MAINLY USED FOR LAND SURVEYING , BY WHICH AN AREA MAY BE DEATAILED.
1. Distance Measurement between two points.(LENGTH)
2.Clockwise Angle Measurement of a line joining two points from Magnetic Meridian.(BEARING)
From Magnetic Meridian Clockwise Angle Measurement of a line AB in a direction from point A to B is called Fore Bearing and angle measured in a direction from point B to A is called Back Bearing.
Back Bearing = Fore Bearing + 180 , if F.B. < 180
Back Bearing = Fore Bearing - 180 , if F.B. > 180
Reduced Bearing Shows in NE, SE, SW, NW Directions. The Formula is.......
If Bearing < 90 , Reduced Bearing is NE = BEARING,
If Bearing > 90 < 180 , Reduced Bearing is SE = 180 - BEARING,
If Bearing >180 <270 , Reduced Bearing is SW = BEARING - 180 ,
If Bearing >270 < 360 , Reduced Bearing is NW = 360 - BEARING,.
Above are the some brief introductory principles of Land Surveying.