ncl_c_nnpnts man page
c_nnpnts — interpolate at a single point
void c_nnpnts(float, float, float *);
void c_nnpntinits (x, y, z);
The X coordinate of the point where interpolation is desired.
The Y coordinate of the point where interpolation is desired.
*z is the interpolated functional value at the point (X,Y).
This function is invoked when you want to interpolate at an individal point. c_nnpntinits must be called prior to calling c_nnpnts. c_nnpntend must be called to terminate single point mode.
To use c_nnpnts, load the NCAR Graphics library ngmath.
natgrid, natgrid_params, c_natgrids, c_nnpntinits, c_nnpntend.
Complete documentation for Natgrid is available at URL
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University Corporation for Atmospheric Research
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