contour lines Flashcards

1
Q

1

A

every point on a contour line is the exact same elevation, they connect points of equal elevation, they survey then connect

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2
Q

2

A

INTERPOLATION is used to estimate the elevation of point b, a equals 100 and c equals 300 so be must be 200.

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3
Q

3

A

EXTRAPOLATION is used to estimate beyond point c, a equals 100 and b equals 400 so must equal 500.

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4
Q

4

A

contour lines always separate points of higher elevation to lower elevation, you must determine which elevation is higher by checking adjacent elevations

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5
Q

5

A

contour lines close to form an irregular circle, but sometimes they form beyond the mapped area so you can’t see the entire circle formed

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6
Q

6

A

the elevation of two adjacent contour lines of different elevations are called CONTOUR INTERVALS, heavier contour lines are known as INDEX CONTOURS

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7
Q

7

A

never cross each other but when they do they are called DASHED CONTOUR, only when overhanging is present,

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8
Q

8

A

contour lines can merge to form a single contour line only where there is a VERTICAL CLIFF

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9
Q

9

A

every space of a contour line represent a UNIFORM SLOPE

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10
Q

10

A

the CLOSER the STEEPER the slope or steeper the closer

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11
Q

11

A

CONCENTRIC SERIES represents a hill

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12
Q

12

A

DEPRESSION CONTOURS have hachure marks on the downhill side and represent a closed depression

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13
Q

13

A

contour lines form a V pattern when crossing streams, the v of the apex always represents uphill(upstream)

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14
Q

14

A

opposite sides of a valley ridge occur in pairs

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