Name

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      EQPOLE

Purpose

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      Convert RA and Dec to X,Y using an equal-area polar projection.

Explanation

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      The output X and Y coordinates are scaled to be between
      -90 and +90 to go from equator to pole to equator. Output map points
      can be centered on the north pole or south pole.

Calling Sequence

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      EQPOLE, L, B, X, Y, [ /SOUTHPOLE ]

Inputs

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      L - longitude - scalar or vector, in degrees
      B - latitude - same number of elements as RA, in degrees

Outputs

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      X - X coordinate, same number of elements as RA. X is normalized to
              be between -90 and 90.
      Y - Y coordinate, same number of elements as DEC. Y is normalized to
              be between -90 and 90.

Keywords

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      /SOUTHPOLE - Keyword to indicate that the plot is to be centered
              on the south pole instead of the north pole.

Revision History

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      J. Bloch LANL, SST-9 1.1 5/16/91
      Converted to IDL V5.0 W. Landsman September 1997