12/28/2023 0 Comments Contour line definition scienceGradient - Topographic maps are not just used for determining elevation, they can also be used to help visualize topography.One of the most basic topographic observation that can be made is the gradient (or slope) of the ground surface. Both scales should be converted to the same units before dividing. Vertical Exaggeration - Vertical exaggeration is computed by dividing the horizontal scale of the map by the vertical scale of the profile. One can think of a profile as a slice through a portion of the terrain (as you were slicing a cake and looking at the vertical face the slice). Profile - A topographic profile is a cross-sectional view along a line drawn through a portion of a topographic map. The point of the V points uphill the legs of the "V" point downhill.Ī hachured contour line, lying between two different contour lines, is the same elevation as the lower contour line.Ī closed contour line, lying between two different contour lines, is at a higher elevation than the lower contour line.Ĭontour lines close together = steep slope RULE OF "Vs" - Contour lines form a "V" when they cross a stream or river. The innermost hachured contour has the lowest elevation the outermost hachured contour has the highest elevation. HACHURED LINES - Represent depressions, volcanic craters, and basins. The inner most closed contour has the highest elevation the outermost closed contour has the lowest elevation If the numbers associated with specific contour lines are increasing, the elevation of the terrain is also increasing.ĬLOSED CONTOURS - Represent hills or mountains. A contour is a line on a map that connects adjacent points of equal elevation.ĬONTOUR INTERVAL (C.I.) - A contour interval is the vertical distance or difference in elevation between contour lines. Topographic maps employ contours as the best way of efficiently and accurately representing the three-dimensional character of the Earth’s surface on a flat, two-dimensional surface. Materials needed to complete this lab: ruler, string, and a calculator.Įlevation - The Earth’s surface is highly irregular, displaying mountains, valleys, cliffs, slopes and depressions. MAPS: CONTOURS, PROFILES, AND GRADIENT - Pages 45 through 58 in your lab manual
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