NAME='Robots'/> MY FORWARD WORK: what is contour and their use

what is contour and their use



Upendra Kumar
The line of intersection of the level surface with the surface of the ground is called contour line. or the line joining at the same elevation above the datum surface. A level surface is a curved surface that has every point on which is equidistant from the center of the earth. A level line is a line on a surface at all the points.
Uses of contour
1. In civil work-(a) For information about the tract of the region, which is flat, undulating or mountainous, etc.
(b) For observation of suitable areas for engaging works, Such as reservoir, canal, sewer line, the road may be approximately selected.
(c) Quantities of earthwork may be computed from the contour map.
(d) To determine the area of the drainage basin and the capacity of the reservoir.
(e) To visibility of the given point can be estimated.
2. In mining - (a) Any change in level, flat or inclined seams, the anticlines or synclinal structures, domes or basins, etc. can be asserted from a contour map and direction of dip can be calculated.




(b) it is a line of the strike and the amount
(c) Determination of the position of shaft inclines and any position of projects can be located.
(d) To mark the highest flood level line.
(e) To determine the gradient of the proposed haul and haulage road in an opencast and underground mine.
(f) It is used for the installation of a pump head from the contour map.
(g) To determine cover over coal seams from stratum contour and surface contour.
(h) Tracing of the outcrop of the seams
(I) To the analysis of geological irritation.
 Locating of contours-There are two methods for locating contours.
1. Direct Method 2. Indirect Method
1. Direct methods very slow and tedious but it is more accurate and is utilized for a small area in countering. In this method, the level of the points on the ground is exactly marked by level instrument or total station, and the position of the points is marked by theodolite, compass, plane table, or total station. The position of the points plotted on the plan and contour drawn by joining them by dotted curve lines.
2. Indirect methods - In this method, the spot of the points are taken in a series of the line along the cross-section or on the corner of the square. The position of spot Hight was taken by the use of total station, DGPS, or tachometer. Then the position of points plotted the plan contours are drawn by interpolation.
what- is -contour- and- their- use


                                    To preparation of above map use of arc gis software 
                           SEE ALSO:-How to calculate co-ordinate



















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