Topographic Maps. A topographic map shows the elevation of an area on Earth Topographic maps allow...
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Transcript of Topographic Maps. A topographic map shows the elevation of an area on Earth Topographic maps allow...
![Page 1: Topographic Maps. A topographic map shows the elevation of an area on Earth Topographic maps allow you to see a three- dimensional landscape on a two-dimensional.](https://reader035.fdocuments.in/reader035/viewer/2022062308/56649d1c5503460f949f18ca/html5/thumbnails/1.jpg)
Topographic Maps
![Page 2: Topographic Maps. A topographic map shows the elevation of an area on Earth Topographic maps allow you to see a three- dimensional landscape on a two-dimensional.](https://reader035.fdocuments.in/reader035/viewer/2022062308/56649d1c5503460f949f18ca/html5/thumbnails/2.jpg)
Topographic Maps
• A topographic map shows the elevation of an area on Earth
• Topographic maps allow you to see a three-dimensional landscape on a two-dimensional surface
![Page 3: Topographic Maps. A topographic map shows the elevation of an area on Earth Topographic maps allow you to see a three- dimensional landscape on a two-dimensional.](https://reader035.fdocuments.in/reader035/viewer/2022062308/56649d1c5503460f949f18ca/html5/thumbnails/3.jpg)
Topographic Maps
• Topographic maps typically have a scale of 1:24,000 (which means that 1 inch measured on the map represents 24,000 inches on the ground)
![Page 4: Topographic Maps. A topographic map shows the elevation of an area on Earth Topographic maps allow you to see a three- dimensional landscape on a two-dimensional.](https://reader035.fdocuments.in/reader035/viewer/2022062308/56649d1c5503460f949f18ca/html5/thumbnails/4.jpg)
Contour Lines
• Elevation is indicated by contour lines
• A contour line is a line of equal elevation
• All points on a contour line have the same elevation
• Contour lines never touch or cross
![Page 5: Topographic Maps. A topographic map shows the elevation of an area on Earth Topographic maps allow you to see a three- dimensional landscape on a two-dimensional.](https://reader035.fdocuments.in/reader035/viewer/2022062308/56649d1c5503460f949f18ca/html5/thumbnails/5.jpg)
Contour Lines
• What do these concentric circles represent?– A peak (hill,
mountain, etc.)
![Page 6: Topographic Maps. A topographic map shows the elevation of an area on Earth Topographic maps allow you to see a three- dimensional landscape on a two-dimensional.](https://reader035.fdocuments.in/reader035/viewer/2022062308/56649d1c5503460f949f18ca/html5/thumbnails/6.jpg)
Consider an Island . . .
![Page 7: Topographic Maps. A topographic map shows the elevation of an area on Earth Topographic maps allow you to see a three- dimensional landscape on a two-dimensional.](https://reader035.fdocuments.in/reader035/viewer/2022062308/56649d1c5503460f949f18ca/html5/thumbnails/7.jpg)
Consider an Island . . .
• Contour lines are like imaginary shorelines
![Page 8: Topographic Maps. A topographic map shows the elevation of an area on Earth Topographic maps allow you to see a three- dimensional landscape on a two-dimensional.](https://reader035.fdocuments.in/reader035/viewer/2022062308/56649d1c5503460f949f18ca/html5/thumbnails/8.jpg)
Contour Lines
![Page 9: Topographic Maps. A topographic map shows the elevation of an area on Earth Topographic maps allow you to see a three- dimensional landscape on a two-dimensional.](https://reader035.fdocuments.in/reader035/viewer/2022062308/56649d1c5503460f949f18ca/html5/thumbnails/9.jpg)
Slope• You can tell how steep the terrain is by
how close the contour lines are to one another– If contour lines are close = steep slope– If contour lines are far apart = gentle slope
![Page 10: Topographic Maps. A topographic map shows the elevation of an area on Earth Topographic maps allow you to see a three- dimensional landscape on a two-dimensional.](https://reader035.fdocuments.in/reader035/viewer/2022062308/56649d1c5503460f949f18ca/html5/thumbnails/10.jpg)
What is the elevation at points X?
• X(a) – 540 m
• X(b) – 580 m
• X(c) – 600+ m
![Page 11: Topographic Maps. A topographic map shows the elevation of an area on Earth Topographic maps allow you to see a three- dimensional landscape on a two-dimensional.](https://reader035.fdocuments.in/reader035/viewer/2022062308/56649d1c5503460f949f18ca/html5/thumbnails/11.jpg)
Match the Contour Lines to the Topographic Profile
![Page 12: Topographic Maps. A topographic map shows the elevation of an area on Earth Topographic maps allow you to see a three- dimensional landscape on a two-dimensional.](https://reader035.fdocuments.in/reader035/viewer/2022062308/56649d1c5503460f949f18ca/html5/thumbnails/12.jpg)
Water Flow
• Which direction does water always flow?
DOWNHILL!• Water always flows perpendicular to
contour lines (i.e. downhill)
![Page 13: Topographic Maps. A topographic map shows the elevation of an area on Earth Topographic maps allow you to see a three- dimensional landscape on a two-dimensional.](https://reader035.fdocuments.in/reader035/viewer/2022062308/56649d1c5503460f949f18ca/html5/thumbnails/13.jpg)
Which direction will water flow?
![Page 14: Topographic Maps. A topographic map shows the elevation of an area on Earth Topographic maps allow you to see a three- dimensional landscape on a two-dimensional.](https://reader035.fdocuments.in/reader035/viewer/2022062308/56649d1c5503460f949f18ca/html5/thumbnails/14.jpg)
Topographic Map Rules
• Lines that are close together indicate steep slopes– The area circled in red is
very steep, because it has many lines crowded close together
• Lines that are far apart indicate gentle slopes– The area circled in blue is
not steep, because it has lines that are spread far apart
![Page 15: Topographic Maps. A topographic map shows the elevation of an area on Earth Topographic maps allow you to see a three- dimensional landscape on a two-dimensional.](https://reader035.fdocuments.in/reader035/viewer/2022062308/56649d1c5503460f949f18ca/html5/thumbnails/15.jpg)
Topographic Map Rules
• Since contour lines must remain at the same elevation, they bend when they cross riverbeds
• A riverbed drops downward, so the contour line must bend upstream to stay at the same elevation
• When contour lines cross a stream, they form a “V” that always points uphill
![Page 16: Topographic Maps. A topographic map shows the elevation of an area on Earth Topographic maps allow you to see a three- dimensional landscape on a two-dimensional.](https://reader035.fdocuments.in/reader035/viewer/2022062308/56649d1c5503460f949f18ca/html5/thumbnails/16.jpg)
Watersheds
• A watershed is the area of land where all of the water that drains off of it goes into the same place
![Page 17: Topographic Maps. A topographic map shows the elevation of an area on Earth Topographic maps allow you to see a three- dimensional landscape on a two-dimensional.](https://reader035.fdocuments.in/reader035/viewer/2022062308/56649d1c5503460f949f18ca/html5/thumbnails/17.jpg)
Delineating a Watershed
1. Mark the area of interest
2. Mark the high points adjacent to the area of interest
3. Starting at the area of interest, draw a line connecting all of the high points on one side of the waterbody
– Watershed lines must ALWAYS cross contour lines perpendicularly
![Page 18: Topographic Maps. A topographic map shows the elevation of an area on Earth Topographic maps allow you to see a three- dimensional landscape on a two-dimensional.](https://reader035.fdocuments.in/reader035/viewer/2022062308/56649d1c5503460f949f18ca/html5/thumbnails/18.jpg)
Delineating a Watershed
![Page 19: Topographic Maps. A topographic map shows the elevation of an area on Earth Topographic maps allow you to see a three- dimensional landscape on a two-dimensional.](https://reader035.fdocuments.in/reader035/viewer/2022062308/56649d1c5503460f949f18ca/html5/thumbnails/19.jpg)
Delineating a Watershed
![Page 20: Topographic Maps. A topographic map shows the elevation of an area on Earth Topographic maps allow you to see a three- dimensional landscape on a two-dimensional.](https://reader035.fdocuments.in/reader035/viewer/2022062308/56649d1c5503460f949f18ca/html5/thumbnails/20.jpg)
Practice Problem #1 Answer
![Page 21: Topographic Maps. A topographic map shows the elevation of an area on Earth Topographic maps allow you to see a three- dimensional landscape on a two-dimensional.](https://reader035.fdocuments.in/reader035/viewer/2022062308/56649d1c5503460f949f18ca/html5/thumbnails/21.jpg)
Practice Problem #2 Answer