lect_01_ - Coordinate Systems To describe the location in...

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1 Coordinate Systems To describe the location in space of a point in a fluid, a coordinate system is used. A commonly used coordinate system is the rectangular, or x,y,z system (also known as Cartesian). x y z x 0 y 0 z 0 (x 0 ,y 0 ,z 0 ) Rectangular coordinates are often used to describe motions of the atmosphere or ocean, even though the earth is a sphere. In so doing, one assumes that the x-y plane is tangent to the surface of the spherical earth. General convention for use of rectangular coordinates: x is a measure of distance from some origin and increases toward the east . y is a measure of distance from some origin and increases toward the north . z is zero at surface of earth and increases upward .
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