![]() ![]() Difference Between CPM and PERT/PERT Vs CPM.Difference Between Carpet Area and Built-up Area.Difference Between 33, 43 and 53 Grade Cement.smaller the scale, greater the interval ratio.įunds available: Lower the contour interval, the greater amount of work. The scale of the map: The contour interval should be the inverse ratio of the scale i.e. Where the large interval is used in large areas compared to less important works. Purpose of the survey: If the area is to be surveyed is small the contour interval is also small e.g. If it’s not large the contours will come too close. In another hand, which countries have hilly region the contour intervals are large. Nature of Ground In those countries which have flat and uniform sloping ground, the contour interval is small. There are various factors in contour surveying on which the selection of the appropriate contour interval depends. Factors affecting the selection of Contour Interval The horizontal distance between the two adjacent contours is called horizontal equivalent. The variable contour interval gives a false impression of the relative steepness of the surface in different parts of the map. We should use a constant contour interval through a map. The constant vertical distance between any two consecutive contours is called the contour interval. ![]() So contour map serves both, a plan and a section of that area. It also produces a plan of that particular portion. Here we can easily access the altitudes of the earth surface. A contour line consists of the same points so all the same points exist in a single contour line. The line which passes through saddles is called the watershed line.Ĭontour line can’t be a break, it must be continuous. It represents the junction of two ridges or a dip in a ridge. Four sets of contours are represented here. Depression between summits is called a saddle.Contour lines never run into one another unless there is a vertical cliff.Contour lines are not cross to each other whether there is an overhanging cliff.Contour lines can’t end anywhere but close on themselves or outside the map limit.If the higher value is inside it indicates ‘Ridge’ or if a higher value is outside the bend it denotes ‘Valley’. Contour lines are right angle in the valley or ridge portion.A series of closed contour lines are indicating depression if the higher value is outside.A series of contour line which is closed to each other indicated a hill and the higher value inside. ![]()
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