jMap is a module of jLab.

  jMap:  Mapping scattered data using local polynomial fitting
    polysmooth - Smoothing scattered 2D data with local polynomial fitting. 
    spheresort - Sorted great circle distances to nearby points on the earth.
    twodsort   - Distances from data points to nearby grid points.   
    Low level functions
    matinv     - Fast inversion of arrays of small matrices.

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