The angle between the arbitrary meridian and a line is known as the ‘arbitrary bearing’ of the line.Ĥ. Sometimes the starting line of a survey is taken as the arbitrary meridian. Arbitrary meridian Sometimes for the survey of small area, a convenient direction is assumed as a meridian, known as the ‘arbitrary meridian’. The angle between the magnetic meridian and a line is known as the ‘magnetic bearing’ or simply the ‘bearing’ of the lineģ. This direction is known as the ‘magnetic meridian’. Magnetic meridian When a magnetic needle is suspended freely and balanced properly, unaffected by magnetic substances, it indicates a direction. The angle between the true meridian and a line is known as ‘true bearing’ of the line. The true meridians passing through different points on the earth’s surface are not parallel, but converge towards the poles.īut for surveys is small areas, the true meridians passing through different points are assumed parallel. The true meridian at a station is constant. 1.True meridian The line or plane passing through the geographical north pole, geographical south pole and any point on the surface of the earth, is known as the ‘true meridian’ or ‘geographical merdian’.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |