A B Depressions Contour lines which show a depression,
crater, or sinkhole on a map. Shown by dashed lines (hachure marks) on the inside of a contour line The elevation of the first depression contour is the same as the lowest regular contour near it.
Rules for Contours The lowest possible elevation for a depression is 1 more than what the next contour should be.
90 90 80
The lowest possible elevation of a depression is just above the value of the next line that is not shown
51 70 60 50
100 100 50 Benchmarks
a location whose exact elevation is known and is noted on a brass or aluminum plate. bench marks are
shown on maps by an X with the letters BM written next to them. Map Scales Indicates the distance on the map compared to
distance in the real world Graphical - by a line divided into equal parts and marked in units of length. Map Scales
Numerically usually by writing a fraction to show what part of the true distances map distances really are. 1:63,360 One inch on the map equals 63,360 Inches in the real world. (There are 63,360 inches in a mile)
Gradient The slope between any two points on a hill Gradient =
Change in Field Value Distance Gradient A trail is four miles long as measured by the scale on a map. The beginning of the
trail is at the 1,060 ft contour line and the end of the trail is at the 960 ft contour line. Calculate the gradient of the trail. Gradient = 1060 ft 960 ft
4 miles = 25.0 ft/mi Gradient Contour Interval = 20 ft
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