✓ Find the quotient of the difference between two contour index lines (step 2) and the number of lines between two index lines by adding 1 (step 4). ✓ Let’s take a simple example: If the number of lines between two index lines is 5. ✓ The number of lines calculated in the above step is noted and added with 1. ✓ We need to calculate the number of non-index lines contour lines between the 2 index contour lines selected for the contour interval calculated in Step 1. To note the difference, now minus the higher elevated line with the lower elevated line reading. ✓ Now, find the difference between the 2 chosen index contour lines from a map. ✓ At first, we need to locate two index contour lines that are given with a specific elevation. ✓ To calculate the contour interval, we need to divide the difference in elevation between the index contour lines by the number of contour lines from one index contour line to the next.Ģ. ✓ The commonly utilized contour interval is 20 feet for a 1:24,000 map scale.
✓ The contour interval is described in every map on the right-bottom side. ” If THE area to be mapped is larger, THE contour interval will be larger & vice versa” ✓ Different contour interval is taken for the various maps. Example Calculation of Contour IntervalĪ contour interval is a vertical distance or the difference in the elevation between the two contour lines in a topographical map.
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