Intd (INTerpolate from Deflection files) is used to interpolate and compute the N/S and E/W components of the deflection of the vertical at any given latitude/longitude combination. In addition, the horizontal Laplace azimuth correction is computed. This interpolation can be done for one or more points, interactively or through input/output files.
For additional information, contact: NOAA National Geodetic Survey, ngs.infocenter@noaa.gov
Visit: https://geodesy.noaa.gov/GEOID/DEFLEC12B/DEFLEC12B_data.shtml
Grids can be found on the NGS web site under each DEFLEC model. https://geodesy.noaa.gov/GEOID/models.shtml
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