Intersection Method of Plane Table Surveying
Select two instrument stations P and Q, such that all the points or details to be located are visible from both the stations. Now set the table on P and make it centered and level. Using the plumbing form locate the ground station on the sheet i.e. p, such that the point p on the sheet is exactly over the point P on the ground. Measure the distance between P
Physical Features of the Earth
Physical features refer to the natural characteristics and elements of a particular geographical area. They include various aspects such as mountains, rivers, slopes, plains, and other landforms. These features are essential for understanding the topography and geography of a region. The physical features map includes the existence of the: Mountains Rivers Slope or plain areaGround Control
In order to produce an accurate map from aerial photograph it is absolutely necessary to established ground control. It consists in locating the positions of a no of pts. All over the area to be surveyed det their levels. These control pts short be such that can be easily identified on the photographs.Surveying Dictionary Words Definitions Starting from M, N, O, P
Magnetic declination is the horizontal angle between true north (i.e., the geographic meridian) and magnetic north (i.e., the magnetic meridian). There are two conventions for specifying the angle. One is to indicate the magnitude (e.g., 6o) and direction as E or W of north. The other considers positive values to be toward the east and negative values to be toward the west.
