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Mapping Earth Midterm Review

Learn how to read and draw isolines, understand topography using contour maps, find intervals, identify hills and slopes, determine river direction, and interpret maximum/minimum elevations. Practice with examples.

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Mapping Earth Midterm Review

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  1. Mapping Earth Midterm Review Topics: Isolines Drawing isolines Topography (Reading Contour maps) Finding Interval Hills Steep/gradual slopes Gradient River Direction Maximum/minimum elevation Depressions (hachured marks) Profiles

  2. Isolines • Connect points of equal value • Isotherm: temperature • Isobars: barometric (air pressure) • Contour lines: elevation

  3. Drawing Isolines • Connect the points with the same value • Estimate between which other values the line should be drawn • Lines should be curved, not angular • Extend lines to edge of map • Never cross isolines

  4. Topography (Contour maps) • 1-dimensional representation of a 3D landscape • Shows the shape of the land

  5. Finding Interval • Difference between one contour line and the next • May be given on map • Labeled lines are Index Contours

  6. Subtract the value of two consecutive Index Contour Lines • Then count how many contour lines there are from one Index Contour to the next (only count one of the Index Contours) • Divide the difference by the # of lines 300-200=100m 5 lines 100/5= 20m

  7. Hills • Hills or mountains are shown by contour lines that form closed loops

  8. Steep/gradual slopes • Steep Slope: contour lines are close together • Gradual Slope: contour lines are far apart

  9. Gradient Difference in Elevation Distance between two points • Label with given units!

  10. River Direction • Contour lines bend upstream

  11. Ocean is Sea Level = 0 elevation

  12. Depressions (hachured marks) • The first hachured line is the same value as the last contour line. • Each hachured line decreases by the contour interval

  13. Ocean= • Interval = • 1st Hachured line = 20 • Elevation at point A= 0 10 10

  14. Inferring Maximum/minimum elevation • Max: Value just below what the next contour line would equal Z= • Min: Value just above what the next contour line would equal Y= • Z 99 ft • Y 21 ft

  15. Maximum Elevation • Represented by Triangle symbol

  16. Profiles • Cross section (side view) of the contour map • Use mark and slide method • Keep a STEADY hand • No numbers on x-axis • Use contour interval on Y-axis

  17. What is the max elevation at point E? What direction is Mud Creek flowing? 139 20 What is the contour interval? SE

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