contour lines Flashcards
1
every point on a contour line is the exact same elevation, they connect points of equal elevation, they survey then connect
2
INTERPOLATION is used to estimate the elevation of point b, a equals 100 and c equals 300 so be must be 200.
3
EXTRAPOLATION is used to estimate beyond point c, a equals 100 and b equals 400 so must equal 500.
4
contour lines always separate points of higher elevation to lower elevation, you must determine which elevation is higher by checking adjacent elevations
5
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
6
the elevation of two adjacent contour lines of different elevations are called CONTOUR INTERVALS, heavier contour lines are known as INDEX CONTOURS
7
never cross each other but when they do they are called DASHED CONTOUR, only when overhanging is present,
8
contour lines can merge to form a single contour line only where there is a VERTICAL CLIFF
9
every space of a contour line represent a UNIFORM SLOPE
10
the CLOSER the STEEPER the slope or steeper the closer
11
CONCENTRIC SERIES represents a hill
12
DEPRESSION CONTOURS have hachure marks on the downhill side and represent a closed depression
13
contour lines form a V pattern when crossing streams, the v of the apex always represents uphill(upstream)
14
opposite sides of a valley ridge occur in pairs