Part 7: Topographic Maps and Contour Lines


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1 Part 7: Topographic Maps and Contour Lines SCALE We have already discussed horizontal scales: for example:. SCALE The vertical scale is also known as. It shows how the looks in. Contour Lines: Contour lines are used to determine and are on a map that are produced from of equal (elevation refers to height in feet, or meters, above sea level). Every on a contour line represents the same. Contour lines can never one another. Each line represents a elevation, and you can t have two elevations at the same point. Moving from one line to another always indicates a change in. To determine if it is a positive ( ) or negative ( ) change you must look at the contours on either. The contour lines are to one another, the the slope is in the real world. If the contour lines are it is a slope, if they are not evenly spaced the slope. Creating topographic profiles: Remember that topographic maps represent a view of the landscape as seen from. For producing a detailed study of a it is necessary to construct a topographic or through a particular interval. A topographic profile is a view along a line drawn through a portion of a topographic map.
2 Part 7: Topographic Maps and Contour Lines HORIZONTAL SCALE We have already discussed horizontal scales: for example: 1:100,000. VERTICAL SCALE The vertical scale is also known as contour intervals. It shows how the surface looks in 3D space. Contour Lines: Contour lines are used to determine elevations and are lines on a map that are produced from connecting points of equal elevation (elevation refers to height in feet, or meters, above sea level). Every point on a contour line represents the exact same elevation. Contour lines can never cross one another. Each line represents a separate elevation, and you can t have two different elevations at the same point. Moving from one contour line to another always indicates a change in elevation. To determine if it is a positive (uphill) or negative (downhill) change you must look at the contours on either side. The closer contour lines are to one another, the steeper the slope is in the real world. If the contour lines are evenly spaced it is a constant slope, if they are not evenly spaced the slope changes. Creating topographic profiles: Remember that topographic maps represent a view of the landscape as seen from above. For producing a detailed study of a landform it is necessary to construct a topographic profile or crosssection through a particular interval. A topographic profile is a crosssectional view along a line drawn through a portion of a topographic map.
3 A profile may be constructed quickly and accurately across any straight line on a map by following this procedure:
4 Contour Lines of a Stream Bed
5
6 HOWTO GUIDE : Topographic Profile (Crosssection) 1) Pencil the line of your interest in lightly on your map. 2) Place a blank piece of paper along the line you have drawn. 3) On both the blank paper and the map, mark clearly the starting and ending points of your line of section. Below these marks, write down the elevation of the starting and ending points of your section. 4) Make a tic mark wherever the paper crosses a contour line on the map. Write the elevation of the contours below their tics on your paper. Make a note of the highest and lowest points on the profile for use later. 5) Once you are certain you have all of the appropriate tic marks and elevations, remove your paper from the map. Get a piece of graph paper that is at least as long as your line of section (you can piece them together if you have to, but make sure all the grids line up). Place your paper with the tic marks on the graph paper (once again, you may want to tape it down) and mark the starting and ending points of your line of section on the graph paper. 6) Draw vertical lines above your starting and ending points, these will be the boundaries of your profile. Use the maximum and minimum elevations along your line of section to determine how long to draw these lines.
7 7) Beginning with your starting elevation, go directly above the tic mark on your paper and make a small dot on the graph paper at the corresponding elevation. Make a small dot for each tic mark on your paper. 8) Connect the dots on the graph paper, and you have a topographic profile!
8 TO DO: Create a cross section (topographic profile) of A to B from this map. Assume the length from A to B is 500 m. Draw your cross section on the grid. A B
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