The vertical length among any two consecutive contours is called a contour interval. Suppose a map involves contour lines of a hundred m, ninety eight m, 96m, and so on. If your contour lines are not numerically labeled and adjacent lines provide the identical design (Along with the similar weight, https://johnnyzifkm.bloggactif.com/33600334/fascination-about-contour-survey-in-dhaka