Hodograph

A hodograph is a diagram that gives a vectorial representation of the movement of a body or a fluid. It is the locus of one end of a variable vector, with the other end fixed. The position of any plotted data on such a diagram is proportional to the velocity of the moving particle. It is also called a velocity diagram. It appears to have been used by James Bradley, but its practical development is mainly from Sir William Rowan Hamilton, who published an account of it in the Proceedings of the Royal Irish Academy in 1846.
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(n.)
A curve described by the moving extremity of a line the other end of which is fixed, this line being constantly parallel to the direction of motion of, and having its length constantly proportional to the velocity of, a point moving in any path; -used in investigations respecting central forces.
  

A plot representing the vertical distribution of horizontal winds, using polar coordinates. A hodograph is
obtained by plotting the end points of the wind vectors at various altitudes, and connecting these points in order of increasing height. Interpretation of a hodograph can help in forecasting the subsequent evolution of thunderstorms (e.g., squall line vs. supercells , splitting vs non splitting storms , tornadic vs. nontornadic storms , etc.).

hodograph
đường đầu tốc, tốc độ, đường đầu mút vectơ
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