earth’s positions
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Earth’s Positions
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Coordinate System
• There are many different ways that can be used to figure out positions on the earth
• A coordinate system uses a grid of imaginary lines and two points to determine the position
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Latitude Longitude Coordinate System
• This is the most commonly used system
• This is based on observations of the sun and stars
• The axes and lines are called parallels and meridians
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Parallels
• The parallels are better know as Latitude – They are lines going across the Earth from
East to west • The North and South poles are 90 degrees and the
equator is 0 degrees
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Meridians
• Better know as Longitude lines These are the lines running between the North and South poles going from West to East – The Prime Meridian is the cline in the center =
0 degrees
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Positions Characteristics
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Fields
• Fields is a place of space that contains a measurable quantity at every point – Temp – Air pressure – Magnetism – Gravity – Humidity
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Models
• There are many different types of models to show the fild qual;ity of something – A model is simplified representation of
objects, structures or systems – They are used to analyze data, explain
something , etc…
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Isoline Models
• Isolines connect points that have the same field value – Uses 2 dimension
visuals – They are three main
isoline Models • Contour lines • Isotherms • Isobars
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Contour lines
• This model shows elevation, shape and steepness of the land – This way we can
visualize what it looks like at one shot
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Isobars
• Isobars measure the air pressure in different places – Which have the same
air pressure and which have a drastic change
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Isotherms
• These Isolines connect places with the same temperature
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Iso-surfaces
• Isolines can only show you quantities in 2 dimensional
• These can also be looked at in three dimensional. – This map is called Iso-
surfaces