GSLIB Help Page: ROTCOORD
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Description:
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2-D coordinate rotation (and reverse rotation)
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Parameters:
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datafl: the input data file.
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icolx and icoly: The columns for the x coordinate
and y coordinate.
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outfl: file for output with rotated (or back transformed) coordinates.
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xorigin and yorigin: the origin of the rotated system in
the original coordinate system.
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angle: the rotation angle (in degrees clockwise).
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switch: if switch=0 then rotate to the new coordinate system
(the default case). If switch=1, however, then the input
x
and y coordinates are considered to be already rotated and they
are back transformed to the original system.