|Hawaiian Islands East-West Deflections (DEFLEC96)
|This 2’ surface deflection of the vertical grid for the Principal Hawaiian Islands
is the DEFLEC96 model. The computation used about 61,000 terrestrial and marine gravity
data held in the National Geodetic Survey gravity data base in July 1996. These data
were augmented by gravity data contributions from NGA (former National Imagery and
Mapping Agency (former Defence Mapping Agency)). The deflections were obtained by
numerical differentiation of cubic spline models along the parallels of the GEOID96
grid. The gravity values are based on the International Gravity Standardization Net
1971 (IGSN71). The deflections are referred to the Geodetic Reference System 1980
(GRS80) ellipsoidal normals. The curvature of the plumb line correction has been applied.
We are particularly grateful to NGA (former National Imagery and Mapping Agency) for
their assistance and their data contributions.