Draw Isolines With An Interval Of 1 at Drawing

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Draw Isolines With An Interval Of 1. Measure the distance from b to d. Calculate the gradient between points e and f.

Earth Science Drawing Isolines YouTube
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An isoline needs to be drawn for every interval. The three lines you drew are special isolines called isotherms. Or for those who wish to start with a simplified version of the contour drawings see the following:

Earth Science Drawing Isolines YouTube

Use the appropriate conversion factor to convert the horizontal map distance to horizontal ground distance. Divide by the interval required. Contour interval= chang in elevation/# of lines. Isolines connect points of equal value.