Mapping the world - PowerPoint PPT Presentation


Title: Mapping the world


1
Mapping the world
  • Field- Any region of space that has some
    measurable value.
  • Field value- The thing that is being measured in
    the field (represented on a map).

2
Examples
  • elevation temperature
  • air pressure snow depth
  • pollution concentration
  • These are all shown as isolines

3
  • Isoline- A line that connects points of EQUAL
    field values.Examples Type of line field
    value Contour line elevation Isotherms tempera
    ture Isobars air pressure

4
Interval
  • Equal change in value from one isoline to the
    adjacent isoline (what the lines go by).
  • Must remain the same for the whole Field Map.

5
Index Contours
  • Numbered contour lines
  • Darker or different color.
  • Normally have even values.

6
Valleys
  • Lower elevations between hilltops or peaks.
  • Relief
  • The difference between highest and lowest point
    on a map (Top of hill to bottom of valley).
  • Note Rivers flow through lowest areas.

7
Rivers/Streams
  • Water must flow downhill.
  • When crossing a stream, contour lines must bend
    (point) upstream!
  • (Like an arrow head pointing up hill)!

8
Steep location or Flat?
  • Steep area (Fast change)-Contour lines are close
    together.
  • Flat area (Slow change)-Contour lines are farther
    apart.

9
Gradient Calculation
  • Use the equation on the front of your ESRT
  • Substitute the data into the equation
  • Solve with proper units!!

10
  • STOP HERE AND CALCULATE

11
Rules for drawing Isolines
  • Connect points of the same value with one line.
  • Always keep higher values on one side and lower
    values on the other side.
  • Lines should be curved smoothly (no sharp
    angles).

12
  • Lines should close in a loop or run off the
    field.
  • Interval between lines must be the same (contour
    interval)
  • Adjacent lines should form similar shapes.

13
  • Lines must never touch or cross one another.
  • When crossing a stream, contour lines must
    bend (point) upstream.
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Mapping the world

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Mapping the world Field- Any region of space that has some measurable value. Field value- The thing that is being measured in the field (represented on a map). – PowerPoint PPT presentation

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Title: Mapping the world


1
Mapping the world
  • Field- Any region of space that has some
    measurable value.
  • Field value- The thing that is being measured in
    the field (represented on a map).

2
Examples
  • elevation temperature
  • air pressure snow depth
  • pollution concentration
  • These are all shown as isolines

3
  • Isoline- A line that connects points of EQUAL
    field values.Examples Type of line field
    value Contour line elevation Isotherms tempera
    ture Isobars air pressure

4
Interval
  • Equal change in value from one isoline to the
    adjacent isoline (what the lines go by).
  • Must remain the same for the whole Field Map.

5
Index Contours
  • Numbered contour lines
  • Darker or different color.
  • Normally have even values.

6
Valleys
  • Lower elevations between hilltops or peaks.
  • Relief
  • The difference between highest and lowest point
    on a map (Top of hill to bottom of valley).
  • Note Rivers flow through lowest areas.

7
Rivers/Streams
  • Water must flow downhill.
  • When crossing a stream, contour lines must bend
    (point) upstream!
  • (Like an arrow head pointing up hill)!

8
Steep location or Flat?
  • Steep area (Fast change)-Contour lines are close
    together.
  • Flat area (Slow change)-Contour lines are farther
    apart.

9
Gradient Calculation
  • Use the equation on the front of your ESRT
  • Substitute the data into the equation
  • Solve with proper units!!

10
  • STOP HERE AND CALCULATE

11
Rules for drawing Isolines
  • Connect points of the same value with one line.
  • Always keep higher values on one side and lower
    values on the other side.
  • Lines should be curved smoothly (no sharp
    angles).

12
  • Lines should close in a loop or run off the
    field.
  • Interval between lines must be the same (contour
    interval)
  • Adjacent lines should form similar shapes.

13
  • Lines must never touch or cross one another.
  • When crossing a stream, contour lines must
    bend (point) upstream.
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