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# Earth’s Positions

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### Earth’s Positions

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