# Topography PowerPoint Presentation, PPT - DocSlides

2017-01-18 98K 98 0 0

##### Description

A . map . showing the surface features of an area. Topography is based on an area’s elevation, relief, and landforms. What is topographic map?. Example:. Contour lines. Contour intervals. Reliefs. How to read . ID: 511301

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### Presentations text content in Topography

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Topography

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A map showing the surface features of an areaTopography is based on an area’s elevation, relief, and landforms

What is topographic map?

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Example:

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Contour linesContour intervalsReliefs

a topographic

map

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A line that connects points of equal elevation.Image an island. (land surrounded by water on all sides). If you walked along the beach where the water and land meet would you be at the same elevation line?If you traced out your path on a map you would have traced out a contour line. A line that follows equal elevation. It might look like this:

Contour Lines

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Now image that the water rose 10 meters and you walked along the path where the water and land meet up. What would your path look like then?

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What if the water rose another 10 meters? How would the contour lines continue to look?

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Contour lines by themselves do not tell you much about the shape of the land but stacking the contour lines together can.

Stacking Contour Lines

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Estimating Elevation

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The change in elevation from one contour line to the nextThe shorter the distance between two contour lines, the steeper the slope

Contour interval

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The change in elevation between contour lines. The contour interval is the same for a given map. The index contours are usually given in round numbers. ( ie. 600 meters or 20 meters)Usually index contours are a bolder looking line. The units of the contour are usually given on the map or located within the legend of the map.

Contour Intervals

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How can you find t

he

contour interval?

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Contour lines that are close together would represent what?A steep slope – the lines being close together means the elevation is changing a lot in a small distance.Contour lines that are far apart would represent what? A gentle slope – the lines being far apart would represent that the slope is not changing much over a large area.

Interpreting Topographical Maps

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If you are walking in a direction where the contour lines are decreasing, are you walking uphill or downhill? Downhill If you are walking in a direction where the contour lines are increasing, are you walking uphill or downhill? Uphill

Interpreting Topographical Maps

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Uphill or Downhill?

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Contour lines in the shape of a V indicate a valley or a ridge line.If the V is pointed downhill, that indicates a ridge line.If the V is pointed uphill, that indicates a valley. ( A possible location of a steam or river)

Interpreting Topographical Maps

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Ridge or Valley?

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The difference between the highest and lowest elevations in an area

Relief

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Many uses in science, business, government, and everyday lifeGPS (hiking climbing, navigating)Planning tripsPlanning buildings, parks, schools, churches

Real world applications

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