Intervals Depressions Gradients Rivers

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Presentation transcript:

Intervals Depressions Gradients Rivers Contour Maps Intervals Depressions Gradients Rivers

Intervals 20 meters 10 meters Interval- the difference in value between any two adjacent isolines

Notice the “different” lines – Called Hachure lines Depressions and Hills Hills Depressions Notice the “different” lines – Called Hachure lines

Isolines that are close together show a greater gradient Use the formula to solve for gradient To calculate the gradient between points Y and Z, determine their values then use a scrap piece of paper to determine the distance between the points Isolines that are close together show a greater gradient 520 ft 490 ft Gradient = 6 ft/mi Distance = 5 miles

Rivers Rivers always flow downhill. Contour lines will always bend upstream. The river flows in the opposite direction that the contours point.

Profiles Step 1: Get a scrap piece of paper 10 20 20 10 10 20 30 40 40 30 20 Step 1: Get a scrap piece of paper Step 2: Line it up under the line X-Y Step 3: Draw “tick marks” for each instance that a contour crosses the line X-Y Step 4: Label each “tick” with its appropriate value

Step 5: Align your scrap paper with the profile as shown above. 10 20 30 40 Step 5: Align your scrap paper with the profile as shown above. Step 6: Place a dot on the graph for each of your “ticks” at the indicated elevation. Step 7: Connect the dots with a smooth curving line.