SIG2LATLON is the jEllipse module of jLab.

 SIG2LATLON  Converts an oscillatory signal to lat/lon displacements.
    [LATRES,LONRES]=SIG2LATLON(X,Y,LAT,LON) where X and Y are zonal and
    meridional displacements, in kilometers, about some time-varying 
    position with latitude LAT and longitude LON, returns the residuals
    between the signal and the position curve.
    latitude and longitude displacements associated with X and Y.  
    The residuals are output first because this is usually what is desired.
    These are essentially LAT-DLAT and LON-DLON, apart from an unwrapping 
    correction for longitude.
    All input arguments are arrays of the same size.  
    Cell array input/output
    If SIG2LATLON is given cell array input, it returns cell array output.
    Thus X, Y, LAT, and LON may each be cell arrays of the same size, 
    where each element in the cell array is a numerical array. The output
    arguments will then also be cell arrays of this size.
    'sig2latlon --t' runs a test.
    Usage: [latres,lonres]=sig2latlon(x,y,lat,lon);
    This is part of JLAB --- type 'help jlab' for more information
    (C) 2014--2016 J.M. Lilly --- type 'help jlab_license' for details

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