Maps

1
Maps

• NotesGreen

2
Creating a map

• Imagine you are an early settler to this area.
  You want to send a map back to your family of The
  Preuss School as well as the path you take during
  A and B days.
• Draw a map of for 15 min of the school and add
  your A and B day walking paths.
• What are some things a map should include?

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What is a map?

• Maps have been used for thousands of years.
• Maps are a way of modeling or representing the
  Earths surface.
• Maps change over time as scientists learn more
  about the landscape.
• Maps can show more than just locations or cities.

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How to start

• When using a map, start with a reference point.
• A reference point is a fixed place from which
  direction and location can be described.
• When talking about the globe, the reference
  points are the North and South Poles these are
  on the globes axis.

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Directions

• There are 4 cardinal directions. These are the
  major directions for a map. They are North,
  South, East, and West.
• For us, West points to the ocean (a reference
  point!)

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Compass Roses

• Compass roses show cardinal directions and
  sometimes more!

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Only so helpful

• A compass is only helpful if
• We have a reference point and know our current
  location
• Have two reference points and can triangulate our
  position
• Many people use a magnetic compass to have the
  North pole as one reference point.

8
True vs Magnetic North

• True North the geographic axis of the Earth on
  which it spins
• Magnetic North the magnetic north that a compass
  will point to. It is offset from true north.

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Depends where you are

• Reading a magnetic compass means you need to
  correct for this difference in true vs magnetic
  north.
• This angle of correction is called magnetic
  declination.

10
Finding our location on the Earth

• Just like we use graph paper in math, we use a
  similar form of graph to locate positions on
  Earth.
• These positions on the globe are labeled by their
  Latitude and Longitude.

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Latitude

• Latitude is the measure North or South of the
  equator. The equator is an imaginary line that
  bisects the Earth, or cuts it in half.
• The equator separates the Northern and Southern
  hemispheres.
• Latitude is measured from 0-90 degrees North or
  South of the equator.

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Longitude

• Longitude is the measure East or West of the
  prime meridian. The prime meridian passes
  through Greenwich, England and divides the Earth
  into Western and Eastern Hemispheres.
• Longitude is measured from 0-180 degrees East or
  West of the prime meridian.