# 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
• 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
• 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.