topographic maps 15 september 2014. why are there two roads from louberg to luluville?
TRANSCRIPT
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Topographic Maps
15 September 2014
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Why are there two roads from Louberg to Luluville?
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And the answer why there are two roads from Louberg to Luluville is…
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Dingle Rd. goes around the mtns. while Bo Ring Way goes UP & OVER
the the mtns.
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Topographic map: map that shows topography & features
found on the earth’s surface --Examples?
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RELIEF: difference in elevation betw. two points
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CONTOUR LINE: connects points of EQUAL elevation (BROWN LINE)Elevation: land-based height above sea level
A map with topographic
contours.
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Sea Level =0 feet
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CONTOUR INTERVAL: distance in elevation between consecutive contour lines
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The island from above.
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II. Labeling Contours
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Island with itsCONTOUR LINES.
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Looking downfrom above.
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Contour Interval = ?
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Contour Interval(C.I.)=250 feet.
--Labeling EVERY line with an elevation getstoo cluttered.
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Instead, we use an INDEX CONTOUR: every FIFTH line is labeled and thicker.
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BENCHMARK: an exact point of elevation that can be marked with an X, +, or BM.
-indicate places where the elevation has actually
been surveyed
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What’s the elevation of points A, B, & C? Which is the highest of the three? Which is the lowest of the three?
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Notice: any place INSIDE a contour line is HIGHER than the contour line. Any place OUTSIDE a contour line is LOWER than the contour line.
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III. The V Rule
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*Contour lines bend to form a V when they cross a river. *The V points upstream.
-Therefore, the river flows the other way
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Summary:
Spruce Knob, W.Virginia:
-Contour Lines?
-Contour Interval?-Index Contour?-Elevation of A & B? -Relief? *From A – B?-Benchmark?-V-Rule?
AB
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NOTES ARE FINISHED FOR TODAY (15 Sept. 2014)
Work on assignment until the bell.
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IV. Depression Contours—Getting into and out of a hole.
17 September 2014
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The highest point (1397’) is on the rim between its outer slopes and crater.
C.I.=200’
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Contours betw. 517’ and 1397’ are fine. But, you cannot have a 1200’ line INSIDE a 1200’ line, and 1000’ line INSIDE a 1200’ line.
Everything insidea contour is supposed to beHIGHER than thecontour.
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DEPRESSION CONTOUR: indicated with “teeth” called HACHURES.
Hachured contours:a point inside a contour is lowerthan the contour.
--A point outside a contour is higherthan the contour.
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From the rim, the land goes down on BOTH sides—towards the outside of the volcano and inside the crater.
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V. Contour Spacing and Steepness (Gradient)
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NOTICE: the slope from atop Mt. Tipster is much STEEPER down to sea than the slope from atop Mt. Riddle down to sea.
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NOTICE: where the slopes are STEEPER the contour lines are CLOSER. Where the slopes are GENTLER the contour lines are FURTHER APART.
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What happens if you have a VERTICAL cliff?????!!!!!!!
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With a cliff, the contours will come together and merge. THIS IS THE ONLY TIME CONTOURS TOUCH!
CI = 10’
?
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THE END
Work on assignment for remainder of class.
17 September 2014