A MODIFIED FOUR-POINT LAGRANGIAN INTERPOLATION METHOD FOR OCEANOGRAPHIC STATION DATA

摘要

In conjunction with design and development responsibility for, an in-water tracking system for AUTEC (Atlantic Undersea Test and Evaluation Center), the Naval Underwater Ordnance Station is analyzing the properties of sea water found in the Tongue of the Ocean. As part of this analysis, Station mathematicians have developed an automatic interpolation method specifically for Oceana graphic data. This method is incorporated in a computer program (IBM 1620) which interpolates the values of depth, temperature and salinity at isentropic levels - designated constant values of the density functions, Basically, the method uses a Four-point Lagrangian polynomial. However, built-in tests edit the data prior to computations, and modifications are made where oceanographic conditions distort the polynomial. This method has been evaluated and its accuracy demonstrated. It is recommended for general use in analyzing oceanographic date.