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FITVPD

       SUBROUTINE  FITVPD (NDP, XD, YD, ZD, NCP, IPC, PD)
 C$    (ALG526 - Internal Partial Derivatives)
 C$    This subroutine estimates partial derivatives of the  first
 C$    and second order at the data points.  The input  parameters
 C$    are:
 C$
 C$    NDP............Number of data points,
 C$    XD(*),
 C$    YD(*),
 C$    ZD(*)..........Arrays  of dimension  NDP containing  the X,
 C$                   Y, and Z coordinates of the data points,
 C$    NCP............Number of  additional data  points  used for
 C$                   estimating partial derivatives at  each data
 C$                   point,
 C$    IPC(*).........INTEGER   array    of   dimension    NCP*NDP
 C$                   containing the  point  numbers of  NCP  data
 C$                   points closest  to  each  of  the  NDP  data
 C$                   points.
 C$
 C$    The output parameter is
 C$
 C$    PD(*)..........Array  of   dimension   5*NDP,   where   the
 C$                   estimated ZX, ZY, ZXX,  ZXY, and ZYY  values
 C$                   at the data points are to be stored.
 C$
 C$    (03-APR-82)